OAR Mechanical Comprehension: Simple Machines Questions and Answers

Question 1

A wheelbarrow is being used to move a heavy load of bricks. This is a classic example of which class of lever?

Accepted Answer

A Class 2 lever

Answer

A compound lever

Answer

A Class 1 lever

Answer

A Class 3 lever

Question 2

A block and tackle pulley system is used to lift an engine. If there are 4 rope segments directly supporting the engine, what is the ideal mechanical advantage (IMA) of the system?

Accepted Answer

4

Answer

2

Answer

8

Answer

6

Question 3

Which of the following best describes the primary advantage of using an inclined plane to move a heavy object to a higher elevation?

Accepted Answer

It decreases the force required by increasing the distance over which the force is applied.

Answer

It decreases the total amount of work required to lift the object.

Answer

It increases the force required but decreases the distance the object must travel.

Answer

It completely eliminates the force of friction acting on the object.

Question 4

An axe head is used to split a log. The axe head functions as which type of simple machine?

Accepted Answer

A wedge

Answer

A screw

Answer

A lever

Answer

A wheel and axle

Question 5

When using a screwdriver to tighten a screw, the handle of the screwdriver functions as which part of a simple machine?

Accepted Answer

The wheel

Answer

The axle

Answer

The lever arm

Answer

The fulcrum

Question 6

Which of the following simple machines is fundamentally an inclined plane wrapped around a cylinder?

Accepted Answer

Screw

Answer

Pulley

Answer

Lever

Answer

Wedge