- how could you use a roller skate, a sidewalk and water to demonstrate how rolling friction works? the water would slow you down because it slows your rolling friction.
- A marble lying in the middle of the floor, use Newton's laws to describe what would happen to the marble? The marble will not move until a force acts upon it. The gravity is pulling down on the marble and the floor is pushing up on the marble.
- a broom strikes the marble while you are sweeping. Use Newton's laws to describe what will happen to the marble? this relates to the 1st law because a force acts upon it to make the marble move.
- Use newton's 3rd law to describe what interactions there is between the marble and the broom. if you push the marble with a certain force the marble is going to push back with a force also. This means for every action there is a reaction.
- What force must be applied to a 10kg object to make it accelerate to 6m/s2? 60Newtons
- Why is terminal velocity an example of balanced force. you cant go any faster because of air resistance. The falling force is as hard as the air resistance.
- When you step out of a boat on to a dock, the boat moves. Why? For every action there is a reaction. The boat is pushing so are you.
- Describe circular motion. Which of Newton's laws helps you describe circular motion? the 2nd law because the object will accelerate in the direction of the force
- if action and reaction force pairs are equal and opposite how can anything move? give an example. rocket. row boat. they act of different things.
Tuesday, May 25, 2010
final notes
Wednesday, May 12, 2010
chapter 19 notes Newtons 3rd law
- Newtons 3rd law states that a force always in equal and opposite pairs and for every action there is an equal and opposite reaction.
- Action-Reaction forces-are always the same but they push or pull in opposite directions
Tuesday, May 11, 2010
- Gravitational force- is also known as weight
- The second law explains how to calculate the acceleration of an object if its mass and the forces acting on it are both known.
- In circular motion, the centripetal force is always perpendicular to the motion.
- Terminal Velocity is reached when the force of gravity is balanced by air resistance.
- An object can speed up, slow down, turn in direction of the net force, if unbalanced forces act upon.
Newton's 2nd law of motion Notes 5/11/10
Tuesday, May 4, 2010
pg. 550-555 ? 1-6
- The turn creates friction between the wheels and the ground when the wheels are rolling and turning.
- Static friction is between the atoms on two surface that are in contact.
- Friction adds resistance between two touching surfaces therefor it made discovering newton's first law of motion complicated.
- No its not moving because the net force is zero.
- A) unbalanced B) balanced C) unbalanced
- Static friction is caused by atoms on the two surfaces are in contact this causes them to stick or weld together. Sliding friction slows down an object that slides. Rolling friction occurs between the ground and part of the tire touching the ground. this keeps the tire from slipping on the ground.
- BONUS QUESTION--How does a space shuttle taking off relate to Newton's 1st law? It starts with zero for speed and gains speed going in a straight line therefore relating to Newton's 1st law.
Newton first law Notes
- The combination of all forces acting upon each other is net force.
- Balance Forces two forces acting upon each other that balance each other out.
- Unbalance force when one force is larger than the other.
- Friction slows objects down.
- 3 Types of Friction:
- Static friction- friction that prevents an object from moving
- Sliding friction- friction due to roughness between two objects
- Rolling Friction- Friction between the ground and the wheel.
Thursday, April 29, 2010
Motion Test note!
- Speed- how fast something is going(m/s-distance divided by time)
- Average speed-how fast you covered a certain distance
- Velocity- speed and direction.(m/s + direction going)
- Acceleration-the process of speeding up(m/s2)
- Negative acceleration-the process of slowing down(-m/s2)
- Mass-How much matter is in an object(g, kg)
- Inertia-the resistance to stop an object
- Momentum-mass times velocity of an object the measure of an objects resistance to stopping(p=kg*m/s)
- Displacement-the actual distance you cover from one point to another
- Distance-the actual distance of point
- Law of Conservation of Momentum-the total momentum of objects that collide together is the same before and after they collide
- The distance ways-constant, different directions, deceleration and acceleration.
- A car travels 10km north, 5 km east, 15km south, then 5km north. What is the distance traveled.-35km. What is the displacement.-k=5km east
- An Object's velocity chanves from 30 m/s-23m/s in 3 seconds. What is the acceleration? (23m/s-30m/s/3s= -2 1/2 m/s2)
- A 5kg object moving at 20m/s collides with an object that is 10kg moving at 5m/s. They stick together and move off. What is they're final velocity? (5kg*20m/s+10kg*5m/s=>100kg*m/s+50kg*m/s divide by total weight=>10m/s
Wednesday, April 21, 2010
Motion Chapter review pg. 544 #1-30
Tuesday, April 20, 2010
Notes-Momentum-4/20/10
Monday, April 19, 2010
questions 1-4 pg.538
Thursday, April 15, 2010
Motion Vocabulary
Tuesday, April 13, 2010
Pg. 528-532 ?'s 1-6
Notes 4/13/10
- Acceleration- Change in velocity divided by the time change to occur; speeding up, slowing down and or changing a direction.
- Acceleration can be calculated if you know how an objects velocity has changed during a given time period
- The Formula- A(acceleration)={SF(final speed)-SI(speed initial)}/Time
- Unit for acceleration=(m/sec^2) Meters per second square
- Acceleration is positive when an object is speeding up.
- Acceleration is negative when an object is slowing down.
- Accelerated motion can be graphed with speed on the vertical axis.
- When an object is speeding up the graph has a positive slope(going to the right and up)
- When an object is slowing down the graph has a negative slope(going to right and down or left)
- A horizontal line indicates zero acceleration and is going at a constant speed.
Tuesday, March 30, 2010
Motion-Notes 3/30
- Matter is always moving.
- Motion involves a change in position.
- Distance is the length of the route an object travels when it changes position.
- Displacement is the distances and direction an object moves
- Speed is the distance traveled divided by the time it takes to travel that distance.
- Average speed is the total distance traveled divided by the total time
- Instantaneous speed is the speed an object is traveling at one moment.
- Constant speed is when an object is traveling at the same speed for over a period of time.
- Velocity is the speed of an object and its direction
Monday, March 29, 2010
pg. 522-527 questions
Tuesday, March 23, 2010
pg. 266-267 #1-25
Monday, March 22, 2010
radiometric dating notes 3/22/10
Wednesday, March 17, 2010
3/17/10 Chapter 9 section 3 NOTES!
Thursday, March 11, 2010
Notes 3/11/10
Wednesday, March 10, 2010
pg. 250-255 ?'s 1-5
Monday, March 8, 2010
Notes. 3/8/10
Notes. 3/4/10
Wednesday, March 3, 2010
Notes 3/3/10
Tuesday, March 2, 2010
pg. 249 ?'s 1-5
Thursday, February 11, 2010
Hurricane-Natural Disaster Project
A hurricane is a severe storm, that forms in the southern Atlantic Ocean, Caribbean Sea, Gulf of Mexico or in the eastern Pacific Ocean. Hurricanes need warm tropical oceans, moisture and light winds above them. If the right conditions last long enough, a hurricane can produce violent winds, incredible waves, torrential rains and floods.
Hurricanes rotate in a counterclockwise direction around an "eye." Hurricanes have winds at least 74 miles per hour. There are on average six Atlantic hurricanes each year; over a 3-year period, approximately five hurricanes strike the United States coastline from Texas to Maine.
When hurricanes move onto land, the heavy rain, strong winds and heavy waves can damage buildings, trees and cars. The heavy waves are called a storm surge. Storm surge is very dangerous and a major reason why you MUST stay away from the ocean during a hurricane warning or hurricane.With hurricanes being as powerful as they are, it is not surprising that upon landfall they cause damage and destruction. Even when the hurricane has yet to make landfall, its effects can be dangerous. However, most of the damage caused to man and nature occur as a hurricane makes landfall. Strong Winds, Flooding, Storm Surge, Tornadoes, Rip Tides.
- Board up all windows to help prevent broken windows, which will also help prevent further damage to the interior of your home, and will help prevent injury from broken glass.
- Secure all outdoor furniture to reduce the amount of damage to it, and to help prevent it from being thrown against your (or someone else's) home, and causing more damage to the exterior of the home and the outdoor furniture.
- Turn off gas to prevent gas leaks from broken or damaged gas lines.
- Stock up on battery powered flashlights, candles, and have a battery powered radio.
- Stock up on bottled water, as well as non-perishable foods that can be prepared and eaten without having to be cooked. Be sure to have enough food and water to last for everyone in the home for a week, including pets. And don't forget a can opener and a clean, sharp pocket knife.
- If you have an infant on a bottle, have enough bottles on hand so that you won't have to worry about how you can wash them if there is no clean water. And be sure to either have single use sized cans of formula, or an ice chest with plenty of ice to store any opened cans of formula.
- Stock up on anti-bacterial hand wipes, gel hand cleaners and paper towels in the event there is no water for washing or bathing.
- Have a two week supply of any prescription medications, as well as personal care items (tooth brushes and paste, hygiene products, etc.).
- Have a well stocked first aid kit in the event of injuries. Disinfectants, antiseptics, antibiotic creams, bandanges, cotton balls, aspirin, Tylenol, and a thermometer are some of the basics you need.
- Make sure all vehicles have a full gas tank.
- Have several changes of clothing for each member of the household, and if you have a baby still in diapers, have a two week supply on hand.
- Select the innermost part of your home, on the ground floor, to ride out the storm, but not a basement or cellar. In the event of flooding, being in those areas of your home may make it impossible to escape. Stay away from all windows and glass doors!
- Have mattresses, blankets, pillows, etc. already in place before the storm hits.
- It would also be a good idea to purchase a bedside commode in the event the water and plumbing is rendered out of order during the storm. You can line the receptacle bucket with small garbage bags to make clean-up much easier and more sanitary. These can be purchased from any medical supply store, as well as many drug stores.
- Have a supply of books, puzzles, toys, etc. in the event the electricity is off, especially if you have children.
- You may want to purchase a portable generator, which costs about $500 for an average sized one. This is especially important if someone in the household is on oxygen or other electrical powered medical equipment; it will also keep the foods in your refrigerator/freezer from spoiling in the event of an electrical outage. But if you do use a generator, be sure to follow all instructions and safety precautions that come with it, and do not operate it indoors (carbon monoxide!).
- Fill all bath tubs with clean water; it can be used for sponge baths, flushing toilets, etc. But if there are young children or pets in the home, be sure the door is kept securely closed at all times to prevent a child or pet from falling in the tub and drowning. A young child can drown in two inches of water!
- Go over emergency instructions with everyone in the household such as everyone staying together, away from all windows, etc.
- Also, if there are several members in the household, develop an "accounting system", where everyone is accounted for at all times in the event the storm gets really intense. Since tornadoes are common during hurricanes, this system is extremely important.
- Since water/flooding caused by tidal surge is the leading cause of death and destruction in hurricanes, it is crucial to be aware of your surroundings. If you observe water coming into your house, get to an upper floor immediately.
- If you have pets that stay outside, bring them in during the storm; they deserve safety and comfort, too.
- Have enough cash on hand to last for a while in the event you can't get to the bank or an ATM.
Do not wait until the last day to purchase supplies (food, water, etc.) or you run the risk of there being very little, or even none, of the supplies left that you need. It's a good idea to stock up on all non-perishables at the beginning of hurricane season.
It would also be a good idea to have a cell phone, fully charged, with you so you will have a way to call emergency services if needed, and to contact family/friends to let them know if you are all ok. Just keep in mind, though, that the cell towers may not be working for a while, so it would be a good idea to have a back-up plan to notify family/friends.So you've followed all the preparations – you've made a plan, you've filled up your car's gas tank, you've gathered all the supplies for your disaster kit and your valuable documents are tucked away in a waterproof container. Now what? No one has told you what to do now. How do you keep yourself and your family safe when the hurricane arrives?
- Stay inside and away from windows, skylights and glass doors. Find a safe area in your home (an interior room, a closet or bathroom on the lower level).
- If flooding threatens your home, turn off electricity at the main breaker.
- If you lose power, turn off major appliances such as the air conditioner and water heater to reduce damage.
- Do not use electrical appliances, including your computer.
- Do not go outside. If the eye of the storm passes over your area, there will be a short period of calm, but at the other side of the eye, the wind speed rapidly increases to hurricane force and will come from the opposite direction. Also, do not go outside to see "what the wind feels like." It is too easy to be hit by flying debris.
- Beware of lightning. Stay away from electrical equipment. Don't use the phone or take a bath/shower during the storm.
- Remain indoors until an official "all clear" is given.
- Do not touch fallen or low-hanging wires of any kind under any circumstances. Stay away from puddles with wires in/near them. Do not touch trees or other objects in contact with power lines.
- USE PHONES ONLY FOR EMERGENCIES. Call 911 only for life-threatening situations.
- Call police or utility companies immediately to report hazards such as downed power lines, broken gas or water mains, overturned gas tanks, etc.
- Watch for weakened roads, bridges, tree limbs or porches which could collapse unexpectedly.
- After power is restored, check refrigerated food for spoilage. (Spoiled food is the cause of much sickness two days to a week after the storm.)
- When reinstalling a CB, TV or satelitte antenna, check in all directions to be sure no power lines are nearby. The same goes for climbing trees to clear debris.
- Do not operate charcoal grills, propane camping stoves or generators indoors.