Do your work on a separate piece of paper. Show your work!

1.

Calculate the mechanical advantage when it takes 200N to move a 550N object.

2.

Hans made a tree branch trimming machine to help clean up his yard. The input effort to the machine was 2.7N but the output was 6N. What is the mechanical advantage of this machine?

3.

Robert invented a machine that would do his work for him. His machine used

5.6N and produced 11N. What is the mechanical advantage of this machine?

4.

If a machine requires 17N of work put into it to exert 40N, what is the mechanical advantage of this machine?

5.

A machine produced 121N of force when 100N is input. What is the mechanical advantage of this machine?

6.

Freddie had a machine lift 340N while he only lifted 170N. What is the mechanical advantage of this machine?

7.

Hank invented a machine that could move 400N with only 130N input. What is the mechanical advantage of this machine?

8.

Arnold built a machine to help deliver the morning paper. He had to pull with

38N of force to move a stack of papers that had a force of 92N. What is the mechanical advantage of this machine?

9.

Arnold also used his machine to move 30N of recycled pop cans, but he must input 8N of force to do this. What is the mechanical advantage of this machine?

10.

Sam’s newest invention takes 2N and converts it into 4N of force.

11.

Some of the previous machines had a mechanical advantage of less than 1.

How can they still be useful, since the input force is not being multiplied by the machine?

SPEED RATIO QUESTIONS: each question is referring to the mechanical devices above.

1.

This mechanical device has an input distance of 45m and an output distance of 15m.

2.

Hans’s tree branch trimming machine needs to be moved 0.5m to cut a distance of 0.2m.

3.

Robert’s machine moves 2.3m when the input force moves 5m.

4.

This mechanical device moves 3.6m of each 8.5m of input force.

5.

The input distance is 52m and the output distance is 42m.

6.

Freddie’s machines input distance is 25m while the load moves 11m.

7.

Hank’s machine only moves the load 24m when the input force moves 75m.

8.

Arnold’s machine moves the load 1.8m when the input distance is 6.2m.

9.

Arnold’s second machine has an input distance of 10m to an output distance of 2m.

10. The load moves 0.12m when the effort force moves 0.25m.

MECHANICAL ADVANTAGE AND SPEED RATIO ARE THE SAME MACHINE.

CALCULATE THE EFFICIENCY OF THESE MACHINES