# 8th Grade Unit 2 Exam

12 Questions | Total Attempts: 231  Settings  In the past few weeks we have covered the four different types of mechanical interactions, which are applied, friction, drag and elastic. By now you should be able to answer any quiz on energy transfer and interactions. The exam below will test your understanding of all that. All the best!

• 1.
What is the evidence that an object is increasing in its motion (kinetic) energy?
• A.

The object is not moving.

• B.

The object is turning.

• C.

The object is slowing down.

• D.

The object is speeding up.

• E.

The object is moving at a constant speed.

• 2.
A book slides across the table.What kind of interaction occurs at the bottom surface of the book as it rubs against the table?
• A.

Applied interaction

• B.

Elastic interaction

• C.

Friction interaction

• D.

Drag interaction

• E.

Magnetic interaction

• 3.
Talking about the same book sliding across the table.During this interaction between the book and the table, what happens to the objects?
• A.

The book increases in motion (kinetic) energy while the table decreases in thermal energy.

• B.

The book decreases in motion (kinetic) energy while the table decreases in thermal energy.

• C.

The book decreases in motion (kinetic) energy while the table increases in thermal energy.

• D.

The book decreases in motion (kinetic) energy while the table and book increase in thermal energy.

• E.

The book decreases in motion (kinetic) energy while the table and book decrease in thermal energy.

• 4.
Picture a girl diving into a swimming pool...SPLASH!What type of interaction is this and why?
• A.

Drag because it involves two objects pushing or pulling each other.

• B.

Applied because she will decrease in stored (potential) chemical energy.

• C.

Drag because it involves a gas or liquid.

• D.

Applied because it involves her hands pushing water.

• E.

Friction because it involves her rubbing against the water.

• 5.
Picture a horse pulling a carriage down the street.When the horse pulls the carriage, how does the energy change in the source?
• A.

Decreases in motion (kinetic) energy

• B.

Decreases in thermal energy

• C.

Decreases in stored (potential) chemical energy

• D.

Decreases in stored (potential) elastic energy

• E.

There is no energy change.

• 6.
Think of the same horse pulling a carriage.When the horse pulls the carriage, how does the energy change in the receiver?
• A.

Increases in motion (kinetic) energy

• B.

Increases in thermal energy

• C.

Increases in stored (potential) chemical energy

• D.

Increases in stored (potential) elastic energy

• E.

There is no change in the receiver

• 7.
In one of the activities we did (under the table), you pulled a rubber band back different amounts to see what effect is had on the distance a car was launched by the rubber band.  When the rubber band launches the car, how does the change in the source?
• A.

Decreases in motion (kinetic) energy

• B.

Decreases in thermal energy

• C.

Decreases in stored (potential) chemical energy

• D.

Decreases in stored (potential) elastic energy

• E.

There is no energy change in the source

• 8.
In one of the activities we did (under the table), you pulled a rubber band back different amounts to see what effect is had on the distance a car was launched by the rubber band.When the rubber band launches the car, how does the energy change in the receiver?
• A.

Increases in motion (kinetic) energy

• B.

Increases in thermal energy

• C.

Increases in stored (potential) chemical energy

• D.

Increases in stored (potential) elastic energy

• E.

There is no energy change in the receiver

• 9.
In one of the activities we did (under the table), you pulled a rubber band back different amounts to see what effect is had on the distance a car was launched by the rubber band.The dependent variable in this experiment was...
• A.

The roughness of the surface

• B.

The distance the car moves

• C.

The length the rubber band is stretched

• D.

The amount of friction between the wheels and the floor

• E.

The mass of the toy car

• 10.
As a soccer ball flies through the air, it decreases in motion (kinetic) energy.What is the energy receiver and what happens to its energy?
• A.

Foot - increase in motion (kinetic) energy

• B.

Air - decrease in thermal energy

• C.

Soccer ball - increase in motion (kinetic) energy

• D.

Soccer ball - decrease in stored (potential) elastic energy

• E.

Air - increase in motion (kinetic) energy

• 11.
What is the difference between an applied and friction interaction?
• A.

They both require objects be moving.

• B.

The receiver in applied always increases in motion (kinetic) energy and the receiver in friction always increases in thermal energy.

• C.

The receiver in friction always increases in motion (kinetic) energy and the receiver in applied always increases in thermal energy.

• D.

The thermal energy will always increase in both, but the motion (kinetic) energy in applied will always decrease.

• E.

The motion (kinetic) energy of both will always decrease in both, but the thermal energy will only increase in applied.

• 12.
What is similar between elastic and drag interactions? Choose the best answer.
• A.

They both involve energy changes in the source and receiver.

• B.

They both involve a gas or liquid increasing in motion (kinetic) energy.

• C.

They both involve an increase and/or decrease in motion (kinetic) energy in either the source, receiver, or both.

• D.

They both involve a change in the amount of stored (potential) elastic energy.

• E.

They both involve a decrease in thermal energy and an increase in motion (kinetic) energy.

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