781 words - 4 pages

WORKSHEET 3

WORK AND POWER

Key Concepts:

WORK (W) – is the PRODUCT of the net FORCE (F) applied and the DISTANCE (d) it travels in the direction of

Force. In equation WORK = force x distance , (W = Fd)

POWER (P) – is the RATE (t) of the doing WORK (W). The FASTER the WORK is done, the GREATER the POWER.

In equation:

Power (P) = WORK (W) / time (t)

* Amount of power does not show the amount of work done. It just gives the time that work requires.

WATTS - unit for power. 1 watt – 1 J/s.

Key Concepts:

WORK (W) – is the PRODUCT of the net FORCE (F) applied and the DISTANCE (d) it travels in the direction of

Force. In equation WORK = ...view middle of the document...

20 000 J/s c. 720 000 000 N.s d. 72 000 000 N.s

5-6. Consider the figure

2 m

2 m

20 N

20 N

5. Neglecting friction, how much work is done in pulling the crate to a distance of 2 meters?

a. 10 N.m b. 40 N.m c. 0.1 N.m d. 5 N.m

6. If the time it takes to raise the crate to a distance of 2 meter is 20 seconds, how much is the power?

a. 0.5 Watts b. 2 watts c. 0.005 Watts d. 0.25 Watts

FORCE vs DISTANCE GRAPH

60

60

| | | | A

A

| |

50

50

| | | | B

B

| |

40

40

| | | | C

C

| |

30

30

| | | | | |

20

20

| | | | D

D

| |

| | | | | |

| | | | | |

FORCE (N)

FORCE (N)

7-8 Refer to the graph.

7. Based from the graph, which person has the

greatest amount work done?

a. A b B c. C d. D

8. Who among the four is the most powerful if

all them did the work with an equal amount

of time?

a. A b B c. C d. D

7-8 Refer to the graph.

7. Based from the graph, which person has the

greatest amount work done?

a. A b B c. C d. D

8. Who among the four is the most powerful if

all them did the work with an equal amount

of...

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