FCTC Applying Mechanical Reasoning 2

Question 1

A lever is 10 feet long with the fulcrum placed 2 feet from the load end. To lift a 200-lb load, approximately how much force must be applied at the other end?

Accepted Answer

50 lb

Answer

25 lb

Answer

100 lb

Answer

200 lb

Question 2

Two gears mesh together. Gear A has 40 teeth and Gear B has 10 teeth. If Gear A rotates at 100 RPM, how fast does Gear B rotate?

Accepted Answer

400 RPM

Answer

25 RPM

Answer

100 RPM

Answer

250 RPM

Question 3

A block and tackle system has 4 rope segments supporting the load. If the load weighs 400 lb, how much pulling force is required (ignoring friction)?

Accepted Answer

100 lb

Answer

50 lb

Answer

200 lb

Answer

400 lb

Question 4

A hydraulic press has an input piston with area 2 sq in and an output piston with area 20 sq in. If 50 lb of force is applied to the input, what force does the output exert?

Accepted Answer

500 lb

Answer

5 lb

Answer

50 lb

Answer

250 lb

Question 5

A wedge is being driven into a log. What happens to the mechanical advantage if the wedge angle is made smaller (thinner wedge)?

Accepted Answer

Mechanical advantage increases

Answer

Mechanical advantage decreases

Answer

Mechanical advantage stays the same

Answer

The wedge stops working

Question 6

A screw has 20 threads per inch and a handle radius of 6 inches. What is its mechanical advantage?

Accepted Answer

About 754

Answer

About 120

Answer

About 377

Answer

About 1200

Question 7

Which type of lever has the effort applied between the fulcrum and the load?

Accepted Answer

Third-class lever

Answer

First-class lever

Answer

Second-class lever

Answer

Fourth-class lever