OAR OAR Mechanical Comprehension: Simple Machines 2

Question 1

A wheel and axle consists of a large wheel attached to a smaller axle. If the wheel radius is 30 cm and the axle radius is 5 cm, what is the mechanical advantage?

Accepted Answer

6

Answer

3

Answer

10

Answer

15

Question 2

A wedge is used to split a log. If you double the length of the wedge while keeping the same width, what happens to its mechanical advantage?

Accepted Answer

It doubles

Answer

It halves

Answer

It stays the same

Answer

It quadruples

Question 3

Which class of lever has the fulcrum between the effort and the load?

Accepted Answer

First class

Answer

Second class

Answer

Third class

Answer

Fourth class

Question 4

A screw with a pitch of 0.5 cm is turned with a screwdriver handle of radius 2 cm. What is the mechanical advantage (use π ≈ 3.14)?

Accepted Answer

25.12

Answer

12.56

Answer

6.28

Answer

4.00

Question 5

In a fixed pulley system, what is the mechanical advantage?

Accepted Answer

1

Answer

0

Answer

2

Answer

Depends on rope length

Question 6

A ramp is 10 meters long and rises 2 meters high. How much force is needed to push a 500 N box up the ramp (ignoring friction)?

Accepted Answer

100 N

Answer

50 N

Answer

250 N

Answer

500 N

Question 7

Two gears mesh together. Gear A has 12 teeth and Gear B has 36 teeth. If Gear A turns at 90 rpm, how fast does Gear B turn?

Accepted Answer

30 rpm

Answer

270 rpm

Answer

90 rpm

Answer

45 rpm