Work
What vocabulary word means the ability to do Work?
Energy
What is the definition of kinetic energy?
Energy of motion
What force produces heat?
Friction
Increase, decrease, or stay the same: As the pendulum swings from position A to position B, what happens to its total energy? [Include friction.] *
It remains the same
What is the definition of power?
The rate at which work is done
What is the definition of Work?
When a force moves an object through a distance
What is the definition of gravitational potential energy?
Energy that is stored in an object's position
In what two types of objects is spring potential energy found?
Springs and rubbery things
Increases, decreases, or remains the same for each: A car travels at constant speed up a hill. What happens to its GPE and KE? *
Its GPE increases and its KE stays the same
In the equation for power, what does the W in the equation stand for?
Work
A child applies a constant 10 N force along the handle of a wagon. But he is not strong enough and the cart does not move. How much work does the child do? *
Zero
A 80kg high-diver is on a diving platform that is 9 meters above the water. What is the high diver’s gravitational potential energy?
7200 J
In the equation for spring potential energy, what does the x in the equation stand for? (Be specific; your answer should be a phrase!)
The amount the spring is stretched or compressed
There is a semicircular track whose ends are at a vertical height h. A block placed at one end of the track is released from rest and slides past the bottom of the track. How high does the block rise on the other side of the track? [Include friction.] *
It is between zero and h; the exact height depends on how much energy is lost to friction.
An engine does 700 J of work in 5 s. What is its power?
140 W
A 10.0-newton force is used to push a 5.00-kilogram cart a distance of 3.00 meters. How much work is done on the cart by the push?
30 J
A 1.5 kg bird is gliding with a speed of 4 m/s. What is the bird’s kinetic energy?
12 J
A student compresses the spring in a pop-up toy 0.015 meters. If the spring has a spring constant of 400 N/m, how much spring potential energy is being stored in the spring? *
0.045 J
A 7 kg cart moving from the bottom to the top of a 8 m high hill. For the cart to reach the top of the hill, what is the minimum speed of the cart at the bottom of the hill? (Ignore friction.) *
12.65 m/s
If the cart in the diagram is always pulled to the top of the ramp in the same amount of time once the ramp angle is changed, what happens to the power needed to pull the cart up the ramp?
The power remains the same regardless of the angle
Positive, negative, or zero: As a car moves to the right, the force of gravity acting on the car does ________ work.
Zero
If the speed of a bird were to double and its mass remain constant, what would its kinetic energy be multiplied by?
4
As Keisha slides across the ground, the force of friction acting on her is 50 N. For the first 3 meters, she slides across ice that has no friction. Then she slides across the ground for 2 meters. How much energy is released as heat?
100 J
A 0.2-kg apple is attached to a branch of a tree 3 m above a spring on the ground below. The apple falls and hits the spring, compressing it 0.5 m. If all of the gravitational potential energy of the apple on the tree is transferred to the spring when it is compressed, what is the spring constant of this spring? *
48 N/m
It takes Sarah 5 s to lift a book using 200 J of energy. What is the power that Sarah uses?
40 W