Formula Review for Chapters 11  13 (Motion, Forces, Work, Energy) 

pg 
Formula 
Units 
Word Problem 
Solution 
432 
Work 
Joules 
1) How much work does a crane do if it uses a force of 5,200 Newtons to lift a girder 20 meters? 

432 
Work 
Joules 
2) How much work is done if you are able to move a 5kg rock 20m? 

433 
Power 
watts 
3) What is John's power output if he does 3,960 J of work in 120 seconds? 

446 
Potential Energy 
Joules 
4) What is the gravitational potential energy of a 1,200 kg car at the top of a hill that is 22 meters high? 

463 
Kinetic Energy 
Joules 
5) What is the kinetic energy of a 0.045 kg ball traveling at 4 m/s? 

459 
Efficiency = 
% 
6) Alice and Jim calculate that they must do 1,800 J of work to push a piano up a ramp. However, they actually end up doing 2,600 J of work. What is the efficiency of the ramp? 

(lab) 
Acceleration 
m/s/s 
7) A ball bearing drops from 2 meters in 0.6442 seconds. What is its acceleration? 

375 
Acceleration 
m/s/s 
8) Natalie accelerates her skateboard along a straight path from 0m/s to 4.0 m/s in 4.5 s. Find her average acceleration. 

369 
Velocity 
m/s 
9) A ball bearing rolls across the floor for 4 meters in 3 seconds. What is its velocity? 

401 
Force 
Newtons 
10) A baseball that has a mass of 0.18kg accelerates downwards at 9.8 m/s/s. What is the gravitational force acting upon the baseball? 

415 
Momentum 
kgm/s 
11) Calculate the momentum of a 70 kg speed skater moving forward at 16 m/s 
