True/False (5 each):
____ 1. Displacement, velocity, and acceleration are all vectors, where are distance, speed, and time are scalars.
____ 2. Acceleration is the rate of change of displacement. 
____ 3. The area under a velocity/time graph gives the position.
____ 4. The slope under a velocity/time graph gives the position.
____ 5. When a projectile is launched, horizontal and vertical motion are governed by different equations.
____ 6. The normal force acts perpendicular to the surface.
____ 7. Friction acts in the same direction as motion.
____ 8. Weight is a force caused by gravity.
____ 9. When forces are in equilibrium there is no acceleration.
____ 10. When forces are in equilibrium there is no velocity.
Solutions
- T 2. F 3. T 4. F 5. T 6. T 7. F 8. T 9. T 10. F
Short Answer:
(20 points) A hockey puck with a mass of .30 kg is sliding along ice that can be considered friction-less. The puck’s velocity is 20 m/s. The puck now crosses over a floor that has a coefficient of kinetic friction equal to .35. How far will the puck travel?
(20 points) A stone is dropped from a 75-m high building. When the stone has dropped 15 m, a second stone is thrown downward with an initial velocity such that the stones hit the ground at the same time. What was the initial velocity of the second stone?
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