FCTC Pulleys, Gears, and Levers 3

Question 1

In a block and tackle system, increasing the number of pulleys primarily increases which property?

Accepted Answer

The mechanical advantage

Answer

The speed of the load

Answer

The friction in the system

Answer

The weight of the rope needed

Question 2

A gear train has a driving gear with 10 teeth and a driven gear with 40 teeth. What is the torque multiplication factor?

Accepted Answer

4

Answer

0.25

Answer

10

Answer

40

Question 3

Which type of lever always has a mechanical advantage less than 1?

Accepted Answer

Third-class lever

Answer

First-class lever

Answer

Second-class lever

Answer

All levers have MA ≥ 1

Question 4

If a movable pulley reduces the effort force by half, what is the trade-off?

Accepted Answer

The rope must be pulled twice as far

Answer

The load moves twice as fast

Answer

The pulley wears out faster

Answer

No trade-off exists

Question 5

Two interlocking gears always rotate in which manner relative to each other?

Accepted Answer

Opposite directions

Answer

Same direction

Answer

At the same speed

Answer

At 90 degrees to each other

Question 6

A worker uses a 10-foot pry bar to move a 500-lb rock, placing the fulcrum 1 foot from the rock. How much force must the worker apply?

Accepted Answer

50 lbs

Answer

500 lbs

Answer

55 lbs

Answer

5,000 lbs

Question 7

What is the primary function of an idler gear placed between two gears in a gear train?

Accepted Answer

Change rotation direction of the output gear

Answer

Increase speed

Answer

Reduce torque

Answer

Increase mechanical advantage