Work
Power
Conservation of Energy
Gravitational Potential Energy
Kinetic Energy
100
What are the TWO equations for work?
W=F*d*cos(theta)
W=DeltaE
100
What is the equation for power?
P=w/t
100
What is the equation for conservation of energy?
SigmaE_i=SigmaE_f
100
What is the equation for gravitational potential energy?
E_g=mgh
100
What is the equation for kinetic energy?
1/2mv^2
200
A 5.0 kg box is pushed 4.0 m across a frictionless floor by a horizontal force of 10.0 N. How much work is done by this force?
40 J
200
What are the units of power?
Watts
200
What are the two types of mechanical energy that we can always consider conserved when friction is negligible?
Gravitational Potential Energy and Kinetic Energy
200
Ms. Lee launches an egg into the air at a 90 degree angle. What energy does it begin with? What energy does it have when it reaches its maximum height? When it reaches the ground, what kind of energy does it have?
Kinetic Energy -> Gravitational Potential Energy -> Kinetic Energy
200
A 2kg object moving at 3 m/s has a kinetic energy of:
9 J
300
A 2000 kg car is traveling at 20 m/s. How much work must be done by the brakes to bring the car to a complete stop?
40,000 J
300
A car accelerates from rest to 25 m/s in 10 seconds. If the car has a mass of 1200 kg, what is the average power output of the engine during this acceleration?
37,500 W
300
A 3 kg rock sits on a 0.8 m ledge. If it is pushed off, how fast will it be going at the bottom?
Give 2 decimal places
3.96 m/s
300
A 50 kg pig is hovering 10 m above the floor. How much gravitational potential energy does the pig have?
4905 J
300
A 4 kg bird has 8 J of kinetic energy. How fast is it flying?
2 m/s
400
A 2.0 kg object is lifted 5.0 m vertically at constant speed. The work done by gravity during this process is:
-98 J
400
A 60 kg person climbs a 3.0 m ladder in 5.0 seconds. The power output of the person is approximately:
353 W
400
In a wild shot, Joe flings a pool ball of mass 1kg off a 0.68 m high pool table and the ball hits the floor with a speed of 6 m/s. How fast was the ball moving when it left the table?
4.7 m/s
400
How high would you have to lift a 1000 kg car to give it a gravitational potential energy pf 2000 J?
0.2 m
400
A 3 kg metal ball, at rest, is hit by a 1 kg metal ball moving at 4 m/s, The 3 kg ball moves forward at 2 m/s and the 1 kg ball bounces back at 2 m/s. How much energy is transferred from the small ball to the large ball?
6 J
500
2 spheres with masses indicated in the figure are connected by a rod with a negligible mass. The rod is initially vertical. The system is the rotated about its center until the rod is horizontal. What is the total work done by gravitational force on the system as it rotates from vertical to horizontal?
+60 J
500
A conveyor belt exerts a horizontal force F on a box of mass M. It moves the box a distance d in time t. Derive an equation for the power delivered to the box. 
Fd/t
500
A 6 kg sled starts from rest at the top of a hill and slides down the hill. As the sled passes through a point that is 30 m vertically below its starting point, it has a speed of 20 m/s. How much mechanical energy was dissipated by friction forces in that interval?
600 J
500
A rubber ball with mass 0.2 kg is dropped vertically from a height of 1.5 m above a floor. The ball bounces off of the floor, and during the bounce 0.6 J of energy is dissipated. What is the maximum height of the ball after the bounce?
1.2 m
500
The graph shows the position as a function of time for an object of mass 5 kg moving in 1 dimension. The kinetic energy 
of the object at 5 s is most nearly what?
10 J