Review Questions on Mechanical Systems

Review Questions on Mechanical Systems

Part 1: Definitions

A. Wedge                    _____ A rigid bar with the fulcrum between the input and output forces.

B. Inclined Plane        _____ A grooved wheel with a rope or cord.

C. Screw                     _____ A sloping surface on which an object can move.         

D. Wheel and Axel     ______ A rigid bar with the input force between the output force and fulcrum.

E. Fulcrum                  ______ An inclined plane that travels through an object.

F. Pulley                      ______ The point on which a lever is supported.

G. 1^st Class Lever        ______ An inclined plane wrapped around a rod.

H. 3^rd Class Lever       ______ A shaft that is attached to a larger disk.

Part 2: What type of machine?

1. A screwdriver ______________________________________

2. Stairs  ______________________________________

3.  A doorknob  _____________________________________

4  A sword _______________________________________

5. A shovel ________________________________________

6. The inside of a jar lid _____________________________________

Part 3: Types of levers (give the order of Input, Output, and Fulcrum for each lever)

1.  First class lever:  Input_____  Output_____ Fulcrum _____

2. Second class lever: Input_____  Output_____ Fulcrum _____

3. Third class lever:  Input_____  Output_____ Fulcrum _____

Part 4: Calculating Mechanical Advantage

1. A moveable pulley system with three pulleys and 4 support ropes ________________

2. A second class lever, the input force is 1 m from the fulcrum, the output force is

   5 cm from the fulcrum ___________

3. The inclined plan is 5 m long, and 50 cm high ____________________________

Part 5: 10 Questions About the Previous Chapters

1. What is work? ____________________________________________________________________________

________________________________________________________________________________________________

2. How do you calculate work? _____________________________________________________________

__________________________________________________________________________________________

3. What type of force is friction? _______________________________________

4. How many joules are required to move a box 5 m with a force of 45 N? _____________

5. How much force should be inputted into pulley with a mechanical advantage of 1 if you need to lift a weight that is 12 N?  __________________________________

6.  Sugar is an example of what type of energy?__________________________________

7. If you apply 20 N of force to a machine with a mechanical advantage of 0.5, how much force would the machine put out? ______________

8. What do you call a device made of 2 or more simple machines? ______________________

9.  What increases when you have a mechanical advantage of less than 1?

___________________________________________________

10. How much force is required to lift a 24 kg weight? ___________________________________

11.  When is work done?

12.  Mr. A. lifts a rock 1.5 m by applying a force of 20 N. How much work does Mr. A do on the rock?

13.  You did 450 J on an object and you pushed object 15 m at a constant speed. How much work did you do on the object?

14. What is the difference between Mechanical Advantage and Ideal Mechanical Advantage?

15. Explain three ways in which machines help us to do work.

16.  Calculate the mechanical advantage of a machine that exerts a force of 160 N on an object when you exert a a force of only 20 N.

17.  Use the concept of energy to explain why ideal mechanical advantage is not the same as mechanical advantage for real machines.

18.  What concept is represented by the ratio of the output force to the input force?

19.  Write the mathematical equation to calculate the IMA of Wheel and Axle.

20.  The handle of your garden tap has a radius of 4.0 cm, and is connected to a shaft with a radius of 0.80 cm. What is the ideal mechanical advantage of this wheel and axle?

Happy Reviewing!