What does the law of conservation of energy state?

The law of conservation of energy states that energy cannot be created or destroyed.

The law of conservation of energy states that energy can be created or destroyed.

The law of conservation of energy states that energy cannot be created but CAN be destroyed.

The law of conservation of energy states that energy CAN be created but cannot be destroyed.

the product of force and distance

How is the work output of a machine related to its work input?

work output is always less than work input

work output is always greater than work input

work output is about the same as work input

What can you say about the output force of a machine with a mechanical advantage much larger than 1?

the output force is much larger than its input force

the output force is much less than its input force

the output force and input force are about the same

the output force is in the same direction as its input force

A machine has an efficiency of 75%. What happens to 75% of the work put into the machine, and what happens to the other 25%?

75% of the work input becomes work output while the other 25% of work input is lost to friction.

10% of the work input becomes work output while the other 90% of work input is lost to friction.

50% of the work input becomes work output while the other 50% of work input is lost to friction.

99% of the work input becomes work output while the other 1% of work input is lost to friction.

Apologia Physical Science Module 8

Authored by Andrea Peak

Science

9th Grade

NGSS covered

Used 10+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The force exerted by a machine

Energy

Potential energy

Output force

Input force

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The distance the output force is exerted through, or how far the load moves

Output force

Input force

Input distance

Output distance

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The distance the input force is applied

Output force

Input force

Input distance

Output distance

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The ability to do work

Input distance

Energy

Potential energy

Kinetic energy

Energy that is stored as a result of position or shape

Kinetic energy

Potential energy

Energy

Input force

The force a person exerts on a machine

Output distance

Output force

Input distance

Input force

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The energy of an object due to its motion

Kinetic energy

Potential energy

Energy

Input force

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Apologia Physical Science Module 8

The force exerted by a machine

The distance the output force is exerted through, or how far the load moves

The distance the input force is applied

The ability to do work

Energy that is stored as a result of position or shape

The force a person exerts on a machine

The energy of an object due to its motion

If the speed of an object doubles, what happens to its kinetic energy.

KE is directly proportional to the square of the speed. So if speed doubles, KE will quadruple (22 = 4).

Which of the following is an example of an object with elastic potential energy?

Objects, like the stretched spring, that can stretch or compress and then return to their original shape have elastic potential energy.

Which of the following is an example of electromagnetic energy?

Sunlight is an example of electromagnetic energy which is energy carried in waves through space.

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