Bennett Mechanical Test Pulleys and Levers 3

Question 1

A pair of scissors is an example of which combination of simple machines?

Accepted Answer

Two first-class levers

Answer

Two second-class levers

Answer

A pulley and a lever

Answer

Two third-class levers

Question 2

Which lever class always produces a mechanical advantage less than 1?

Accepted Answer

Third-class lever

Answer

First-class lever

Answer

Second-class lever

Answer

Compound lever

Question 3

Two pulleys are arranged so one is fixed and one is movable. What is the mechanical advantage?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 4

On a balanced seesaw, a 100 lb child sits 3 ft from the pivot. Where must a 60 lb child sit to balance it?

Accepted Answer

5 ft from the pivot

Answer

3 ft from the pivot

Answer

1.8 ft from the pivot

Answer

10 ft from the pivot

Question 5

A bottle opener that pivots against the cap edge is which class of lever?

Accepted Answer

Second-class lever

Answer

First-class lever

Answer

Third-class lever

Answer

Inclined plane

Question 6

If you increase the length of the effort arm on a lever while keeping the load arm the same, the mechanical advantage will:

Accepted Answer

Increase

Answer

Decrease

Answer

Stay the same

Answer

Drop to zero

Question 7

In a block and tackle, what is the trade-off for gaining mechanical advantage?

Accepted Answer

You must pull more rope length

Answer

You must apply more force

Answer

The load moves faster

Answer

Friction is eliminated