net force-
Inertia:
- 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.