FCTC FCTC Test Pulleys, Gears, and Levers Questions and Answers 3

Question 1

A movable pulley is attached to a load weighing 300 lb. Ignoring friction, how much force is needed to lift it?

Accepted Answer

150 lb

Answer

A movable pulley provides a mechanical advantage of 2, so the required effort is 300 ÷ 2 = 150 lb.

Question 2

Gear X (20 teeth) drives Gear Y (60 teeth). If Gear X makes 90 RPM, what is the torque relationship between the gears?

Accepted Answer

Gear Y has more torque than Gear X

Answer

When a smaller gear drives a larger gear, speed decreases and torque increases in the larger gear by the same ratio.

Question 3

A crowbar is being used to pry open a crate. The fulcrum is near the crate (load). What class lever is this?

Accepted Answer

Class 1

Answer

A crowbar with the fulcrum between the effort and load is a Class 1 lever, like a seesaw.

Question 4

A compound pulley system requires 50 lb of effort to lift a 200-lb load. What is the mechanical advantage?

Accepted Answer

4

Answer

Mechanical advantage = Load ÷ Effort = 200 ÷ 50 = 4.

Question 5

Which type of lever is a wheelbarrow an example of?

Accepted Answer

Class 2

Answer

A wheelbarrow is a Class 2 lever because the load is between the fulcrum (wheel) and the effort (handles).

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