final notes

friction-

net force-

Inertia:

1. 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.
2. 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.
3. 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.
4. 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.
5. What force must be applied to a 10kg object to make it accelerate to 6m/s2? 60Newtons
6. 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.
7. 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.
8. 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
9. 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.