Practice Test

Question 1

Which statements correctly compare the work done to move the couches? Choose three correct answers.

Revolt · Accepted Answer

The work for couch 2 is less than the work for couch 3. - not selected, this is the correct answer; The work for couch 2 is greater than the work for couch 1. - correct; The work for couch 3 is greater than the work for couch 1. - correct

Question 2

How much thermal energy is generated?

Revolt · Accepted Answer

1000 J

Question 3

During which trial was the rock the highest above the ground?

Revolt · Accepted Answer

2

Question 4

What is the formula for calculating kinetic energy?

Revolt · Accepted Answer

cap k cap e is equal to 1 half m squared v; cap k cap e is equal to 1 half m v squared

Question 5

Four different balls are moving at the same velocity. Which will have the greatest kinetic energy as it rolls?

Revolt · Accepted Answer

a bowling ball

Question 6

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?

Revolt · Accepted Answer

Earth is an open system because heat energy from the Sun enters through the atmosphere.

Question 7

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.

Revolt · Accepted Answer

Some of the rocks’ potential energy is converted into thermal energy due to the friction of air resistance.; Some of the potential energy of the feather is converted into kinetic energy.; Some of the feather’s potential energy is converted into thermal energy due to the friction of air resistance.

Question 8

A spring that has a spring constant of 1400 cap n over m is stretched to a length of 2 point 5 m If the normal length of the spring is 1 point 0 m , how much elastic potential energy is stored in the spring?

Revolt · Accepted Answer

4375 cap j; 1575 cap j

Question 9

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?

Revolt · Accepted Answer

When there is an angle between the two directions, the cosine of the angle must be considered.

Question 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?

Revolt · Accepted Answer

When there is an angle between the two directions, the cosine of the angle must be considered.

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