Answers2003390-Physics 1 Honors Sem. 1 - PetersCircular Motion

Energy Transformations Answers

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Energy can be changed from one form to another. Which terms can be used to describe these changes? Check all that apply.

A
energy conversion
B
energy conservation
C
energy correlation
D
energy transformation
E
energy transference
2
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Which best describes how energy changes form in a car’s engine?

A
A single transformation occurs because the chemical energy of the fuel is changed to the mechanical energy of the car.
B
A single transformation occurs because the mechanical energy of the car originates from one spark.
C
Multiple transformations occur because the chemical energy of the fuel is changed to several forms of energy.
D
Multiple transformations occur because the chemical energy of the fuel must be replenished to keep the car running.
3

The image shows a pendulum that is released from rest at point A.

Question illustration
A
A: Maximum kinetic energyC: Maximum gravitational potential energy
B
B: Maximum kinetic energyD: Maximum gravitational potential energy
C
A: Maximum gravitational potential energyC: Maximum kinetic energy
D
B: Maximum gravitational potential energyD: Maximum kinetic energy
4

What energy transformation occurs when a skydiver first jumps from a plane?

A
Gravitational potential energy transforms into kinetic energy.
B
Gravitational potential energy transforms into thermal energy.
C
Kinetic energy transforms into gravitational potential energy.
D
Thermal energy transforms into gravitational potential energy.
6

A baseball has a mass of 0.145 kg and is 12 m above the ground. If it has a mechanical energy of 105.8 J, how fast is it moving?

A
17 m/s
B
35 m/s
C
89 m/s
D
130 m/s
7

What is the sequence of energy transformations associated with a hydroelectric dam?

A
electrical energy into mechanical energy into kinetic energy into gravitational potential energy
B
gravitational potential energy into kinetic energy into mechanical energy into electrical energy
C
chemical energy into kinetic energy into mechanical energy into electrical energy
D
chemical energy into thermal energy into kinetic energy into electrical energy
8

A bird has a kinetic energy of 3 J and a potential energy of 25 J. What is the mechanical energy of the bird?

A
3 J, because mechanical energy is the same as kinetic energy
B
22 J, because mechanical energy is the difference of the potential energy and kinetic energy
C
25 J, because mechanical energy is the same as potential energy
D
28 J, because mechanical energy is the sum of the potential energy and kinetic energy
9

If no energy is lost due to friction, which statements about the energy of the ball are true? Check all that apply.

A
The potential energy at the top of the ball’s motion is 18 J.
B
The kinetic energy is less when the ball is thrown than when it is caught.
C
The kinetic energy increases as the potential energy decreases.
D
The kinetic energy decreases as the potential energy increases.
E
The total mechanical energy of the ball stays constant.
F
The mechanical energy decreases as the ball moves up and increases as the ball comes down.
10

What is the basis for analyzing an energy transfer diagram?

A
The mechanical energy input and output must be equal.
B
Heat must always be the largest output.
C
The sum of all outputs must equal the input.
D
Electrical energy is an input but not an output.

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