Practice Test Answers

10 verified answers1 views
2
Free Preview

Which energy transformation occurs after a skydiver reaches terminal velocity?

A
Gravitational potential energy transforms into thermal energy.
B
Gravitational potential energy transforms into kinetic energy.
C
Kinetic energy transforms into gravitational potential energy.
D
Kinetic energy transforms into thermal energy.
3

Earth and all of the air in the atmosphere around it make up an incredibly complex system. Energy is constantly changing forms in many different ways. How would scientists most likely describe the system of the Earth in regard to energy?

A
Earth is an open system because the atmosphere stops energy from escaping into space.
B
Earth is an isolated closed system because energy only escapes the system as heat travels into space.
C
Earth is an isolated closed system because the atmosphere allows energy from the Sun to enter as heat.
D
Earth is an open system because heat energy from the Sun enters through the atmosphere.
5

A bird flies off of a cliff, dropping a feather and knocking rocks off the cliff. The rocks reach the ground much faster than the feather. Which energy transformations occur in this case? Choose three correct answers.

A
All of the feather’s potential energy is converted into thermal energy due to the friction of air resistance.
B
Some of the feather’s potential energy is converted into thermal energy due to the friction of air resistance.
C
Some of the potential energy of the feather is converted into kinetic energy.
D
All of the rocks’ potential energy is converted into kinetic energy because rocks do not experience wind resistance.
E
Some of the rocks’ potential energy is converted into thermal energy due to the friction of air resistance.
8

What is the formula for calculating kinetic energy?

A
cap k cap e is equal to 1 half m squared v
B
cap k cap e is equal to 1 half m v squared
C
cap k cap e is equal to 2 m squared v
D
cap k cap e is equal to 2 m v squared
10

Why is it important to know the direction of the force applied to a moving object and the direction in which the object is moving when determining the work done on the object?

A
If the force acts in the same direction as the motion, then no work is done.
B
A force at a right angle to the motion requires the use of the sine of the angle.
C
Only the component of the force perpendicular to the motion is used to calculate the work.
D
When there is an angle between the two directions, the cosine of the angle must be considered.

Did you find these answers helpful?