OAR OAR Mechanical Comprehension: Simple Machines 5

Question 1

A lever balances when the torque on each side is equal. If a 60 N load sits 2 m from the fulcrum, what effort is needed 4 m from the fulcrum?

Accepted Answer

30 N

Answer

120 N

Answer

60 N

Answer

15 N

Question 2

Which of the following is NOT a simple machine?

Accepted Answer

Spring

Answer

Lever

Answer

Pulley

Answer

Wedge

Question 3

A block and tackle system with 3 movable pulleys and 3 fixed pulleys has approximately what mechanical advantage?

Accepted Answer

6

Answer

3

Answer

9

Answer

12

Question 4

When you tighten a jar lid using your fingers, the lid acts as which component of a wheel and axle?

Accepted Answer

The axle

Answer

The wheel

Answer

The fulcrum

Answer

The effort arm

Question 5

An inclined plane has a mechanical advantage of 5. If the load weighs 300 N, how much effort force is required (ignoring friction)?

Accepted Answer

60 N

Answer

30 N

Answer

150 N

Answer

1500 N

Question 6

Which of the following best describes the trade-off when using any simple machine?

Accepted Answer

You gain force but must apply it over a greater distance

Answer

You gain both force and speed simultaneously

Answer

You gain distance but must apply greater force

Answer

You gain energy from the machine itself

Question 7

A doorknob is an example of which simple machine?

Accepted Answer

Wheel and axle

Answer

Lever

Answer

Screw

Answer

Wedge