1. A car is initially travelling at 30 m/s. The driver hits the brakes and comes to a complete stop in 3 seconds. Assume the acceleration was constant.
(a) What force was responsible for the driver decelerating?
(b) Draw the full force diagram. Assume the car is driving on a flat road. (c) What was the net acceleration of the car?
(d) If the car weighs 1000 kg, what was the net force acting on the car? (e) How far did the car travel before coming to a complete stop?
(f) What is the weight of the car (W = mg)?
2. Which is more intrinsic, mass or weight? How might you test this?
3. How is Newton's first law a special case of his second?
4. Draw the forces acting on a box on an incline plane in mechanical equilibrium:
5. What is the net force in the following diagram? Would the friction force be static, kinetic, or possibly both? Explain your reasoning.
6. Know the properties of static and kinetic friction!