Physics Practice Problems
SHOW ALL WORK! Use a lot of paper.
Use the equations below:
 F = ma (Force = mass X acceleration)
 µ = mv (Momentum = mass X velocity)
 S = d/t (Speed = Distance ÷ time)
 W = Fd (Work = Force X distance)
 P = W / t (Power = Work ÷ time)
 a = Δv/t (Acceleration = change in Velocity ÷ time)

PE = mgh
(Potential Energy = Mass X Gravity X Height)

KE = ½ mv2
(Kinetic Energy = ½ X mass X Velocity2)
Fill in the following 4 blanks with the number that correctly solves each problem. (CAREFUL with units!!!!)
Use the equation for speed:
1. s = 62 m/s
d = 124 m
t = ______
2. µ =100 g-m/s
m = _____
v = 300 m/s
3. F = _____?
m = 700 g
a = 35 m/s2
4. W = 80 J
F = 160 N
d = ______
5. A car can go from rest to 70 km/h in 10s. What is its acceleration?
6. A driver has a goal to make it to St. Louis in 12 hrs. Can the driver make it, legally, to St. Louis if the drive is 850
miles? (Hint: Ignore gas stops and speed limits through town. Assume the speed limit is 75 mi/h.)
7. How much time does the driver in question 6 have to spare for food or gas stops and slower speed limits through
towns?___________________________________
8. The momentum of a car is 20,000 kg-m/s. How much mass does the car have if it is traveling at 2 m/s?
9. The momentum of a bowling ball is 2,000 kg-m/s. How fast was the ball moving if it has a mass of 5 kg?
10. A construction worker does 2,000 J of work. How much does the box weigh if she lifts it 2 m?
11. Use the diagram below to answer the following questions. (A-D, PART B HAS 3 PARTS!!)
A. How much potential energy does an 80 kg high diver have while standing on top
1
of a 25 m platform?
2
B. At which point does the diver have the most Potential Energy? Kinetic Energy?
Total Energy?
3
4
C. The diver jumps off the platform. How much kinetic energy does this diver have
before he hits the water?
D. What is the velocity of the diver when he hits the water?
12. Work and Power
a. How much work is needed to lift a 100 N block 4m?
b. What is the force needed to push the block up the ramp, to same point as part “a”, if the ramp is 9 m long?
c. How much power does the person have if they accomplish this work in 3 s?