Name ______Period _____
Date______
Simple Machines & Work
Study Guide
1.What is the purpose of using a machine?
2.Compare and contrast work inputwork output.
3.What does calculating the mechanical advantage of a machine tell you?
4.If given different situations, how would you select if a person isdoing work on an object?
5.If a box weighs 50 N, what other information do you need to calculate how much work it takes to lift the box?
6.How does a ramp make lifting a heavy object easier?
7.A lever allows a 7.2 N load to be lifted with a force of .9 N. What is the mechanical advantage of the lever?
8.An incline plane is 15 m high and 5 m long. What is the mechanical advantage of the inclined plane?
9. You lift a chair that weighs 25 N to a height of 0.5 m and carry it 10 m across the room. How much work did you do on the chair?
10.
In the image above, the girl is using her arm to lift a weight. Her arm is acting as a _____.11.
Darrell is trying to remove a nail from a board using the claw of a hammer, but the nail is stuck. Which of the following could Darrell do to make the job easier?A. / Use a hammer with a longer handle.
B. / Use a heavier hammer.
C. / Use a hammer with a shorter handle.
D. / Use a hammer with a sharper claw.
12. Refer to the picture above. Where is the fulcrum of this lever located?
13. Refer to the picture above. Because this wheelbarrow combines more than one simple machine, this tool is an example of a ______.
14. Refer to the picture above. What two simple machines make up this wheelbarrow?
15. Refer to the picture above. Using this wheelbarrow can make it easier to lift a heavy object by…
A. / increasing the amount of input force needed to lift the object.B. / reducing the weight of the object.
C. / changing the direction of the input force.
D. / increasing the distance over which the input force is applied.
16. Identify one everyday application for each of the six simple machines. Describe what makes all simple machines alike, and what makes them different from one another.
17. What is the relationship between work and force?
18. You lift a box of toys that weighs 30 N to a height of 0.7 m and carry it 5 m across the room. How much work do you do on the box of toys?
19. Refer to the picture above. Indicate two simple machines being used in the picture.
20. Refer to the picture above. Identify the class of lever used and calculate the mechanical advantage of the lever.
21. Refer to the picture above. What is the fulcrum?
22.
Dean needs to lift the rock shown in the picture above. He wants to use the lever to lift the rock while using the least amount of effort force. At which position should Dean push on the lever? Explain your answer.