Chapter 9 Equation Practice Name ____________________________________
Here are the equations in Chapter 9
_{} _{} _{}
_{} _{} _{}
1. What do the symbols mean, and what units are they measured in?
Symbol 
Meaning 
Units 
W 


F 


d 


t 


PE 


m 


g 


h 


v 


2. Which two equations could you use to find work?
3. How could you decide which one to use?
4. A crane uses 5200 N to lift a beam 5 meters. How much work did it do?
Given and unknown 
Equation 
Solve 
5. The brakes on a bicycle do 125 N of work for 10 meters to stop the bicycle. How much work do the brakes do?
Given and unknown 
Equation 
Solve 
6. A jack uses 5000 J to lift a car 3 m off the ground in 4 seconds. How much power did it exert?
Given and unknown 
Equation 
Solve 
7. You use 12 N of force to move a
Given and unknown 
Equation 
Solve 
8. How much potential energy does a 70 kg pole vaulter have when he is 6 m off the ground?
Given and unknown 
Equation 
Solve 
9. How much energy does a 2.5 kg book 2.0 m off the ground have?
Given and unknown 
Equation 
Solve 
10. How much kinetic energy does a bullet with a mass of 0.02 kg have when it is moving at 200 m/s
Given and unknown 
Equation 
Solve 
11. How much kinetic energy does the pole vaulter above have when he was moving down the track at 20m/s?
Given and unknown 
Equation 
Solve 
12. How high off the ground does a 5 kg ball have to be to have 100 J of energy?
Given and unknown 
Equation 
Solve 