Chapter 14 Study Guide

Question 0

2. What is the formula for work?

Answer 0

W= FD

Question 1

1. In order for work to be done on an object, an object has to _____ in the direction of the applied force.

Answer 1

Move

Question 2

3. What do we measure work in?

Answer 2

Joules

Question 3

4. A student uses a force of 60 N to lift a stack of books a distance of 4 m. How much work did (s)he do?

Answer 3

240 joules

Question 4

5. A gardener uses a lever to lift a rock from the ground. The gardener applies a force of 50 newtons and moves the rock 1.5 meters. How much work is being done by the gardener?

Answer 4

75 N

Question 5

6. What do we measure power in?

Answer 5

Watts

Question 6

7. What is the formula for power?

Answer 6

P=W/T

Question 7

8. A teacher uses 44 joules of work to move a stack of books in 4 seconds. How much power did she use?

Answer 7

11 Watts

Question 8

9. A students uses a lever to apply a 20- newton force to a box while moving the box a distance of 0.5 meter. It takes the student 2 seconds to complete this. How much power did the student use while moving the box?

Answer 8

5 Watts

Question 9

10. What is the force that you apply on the machine called?

Answer 9

Input Force

Question 10

11. What is the force that machines applies on the object called?

Answer 10

Output force

Question 11

12. The __ __ of a machine is the number of times that the machine increases the input force.

Answer 11

Mechanical Advantage

Question 12

13. ___ ___ reduces the efficiency of a machine.

Answer 12

Friction

Question 13

14. A __ __ is a machine that does work with not one movement, and makes work a lot easier.

Answer 13

Simple machine

Question 14

15. A simple machine makes work easier by changing the size, direction, or ___ of the force

Answer 14

Distance

Question 15

16. A ___ ___ is a machine made up of more than one simple machine.

Answer 15

Compound Machine

Question 16

17. What simple machine is an incline plane that moves; it is usually used to separate of split things?

Answer 16

Wedge

Question 17

18. What simple machine is an incline plane wrapped around a cylinder?

Answer 17

Screw

Question 18

19. What simple machine consists of a rigid rod or plank that pivots or rotates about a fixed point called the fulcrum?

Answer 18

Lever

Question 19

20. What simple machine is a made from two circular objects of different diameters that are attached and rotate together?

Answer 19

Wheel & Axle

Question 20

21. What simple machine is a made from grooved wheel with a rope or cable wrapped around the groove?

Answer 20

Pulley

Question 21

22. What simple machine is a flat, sloped surface?

Answer 21

Incline Plane

Question 22

23. Give an example of a incline plane?

Answer 22

Ramp

Question 23

24. Give an example of a wedge.

Answer 23

Axe

Question 24

25. What is an example of a screw?

Answer 24

Meat grinder

Question 25

26. Give a real world example of a lever.

Answer 25

Your arm

Question 26

27. Give a real world example of a pulley.

Answer 26

Window blinds

Question 27

28. What is an example of a wheel and axle?

Answer 27

Doorknob

Question 28

29. A shovel is made up of two different simple machines. The blade of the shovel acts as one type of machine as it separates soil when it enters the ground. The handle of the hovel acts as a second/type of machine when the person using it lifts the soil. What two simple machines make up a shovel?

Answer 28

Lever and Wedge

Question 29

30. A lever can be divided into three classes according to the position of their what?

Answer 29

Fulcrum