Formula Review for Chapter 13 (Work & Energy)






pg 
Formula 
Units 
Word Problem 
Solution 
432 
Work W = F * D 
Joules 
1) How much work does a crane do if it uses a force of 5,200 Newtons to lift a girder 25 meters? 

433 
Power Power = W / T 
watts 
2) What is John's power output if he does 3,960 J of work in 60 seconds? 

446 
Potential Energy PE = m*g*h 
Joules 
3) What is the gravitational potential energy of a 1,200 kg car at the top of a hill that is 42 meters high? 

463 
KE = 1/2 m*v*v 
Joules 
4) What is the kinetic energy of a 0.045 kg ball traveling at 2 m/s? 

459 
Efficiency = Work Output / Work Input 
% 
5) 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 2,400 J of work. What is the efficiency of the ramp? 

(lab) 
Acceleration A = 2D / T squared 
m/s/s 
6) A ball bearing drops from 2 meters in 0.6442 seconds. What is its acceleration? 

(lab) 
Velocity V=D/T 
m/s 
7) A ball bearing rolls across the floor for 6 meters in 3 seconds. What is its velocity? 





