Simple Machines — Unit test

Question 1

The table shows the dimensions of four wedges.

Revolt · Accepted Answer

Y

Question 2

Two examples of energy transformations are shown.

Revolt · Accepted Answer

result in radiant energy.

Question 3

Which best describes a difference between energy transformations in power plants and dams?

Revolt · Accepted Answer

Only power plants use fossil fuels to transform energy.

Question 4

What is the overall energy transformation in a coal-fired power plant?

Revolt · Accepted Answer

chemical to electrical

Question 5

Fiona claims that the diagram below shows simple machines, but Chad claims that it shows a compound machine.

Revolt · Accepted Answer

Fiona is correct because the diagram shows two individual simple machines.

Question 6

The diagram shows an inclined plane.

Revolt · Accepted Answer

4

Question 7

Hedea made a study chart about nuclear energy.Which best describes the error in Hedea’s chart?

Revolt · Accepted Answer

Fission and fusion convert nuclear energy to both radiant and thermal energy.

Question 8

Under which condition is no work done?

Revolt · Accepted Answer

A force pushes up on an object that stays in place.

Question 9

Which phrase best describes a machine?

Revolt · Accepted Answer

any device that makes work easier

Question 10

A 40 kg dog is sitting on top of a hillside and has a potential energy of 1,568 J. What is the height of the hillside? (Formula: PE = mgh)

Revolt · Accepted Answer

4.0 m

Simple Machines — Unit test Answers