BY GROUP 1

Reference:

WWW.WIKIPEDIA.COM

WWW.SLIDESHARE.NET

WORK

In your own words, What’s Work?

Are you doing works when…

1. Lifting weights

2. Walking with a big bag of Grocery in your hand?

3. Writing an essay.

WORK

Work is done only when a constant force applied on an object, causes the object to move in the same direction as the force applied.

Ex.)

A guy pushing a table for 10m.

Physics concept of WORK

1.Push a heavy trolley for 5m

2.You lift your bag upwards by 1m

Considered as WORK

1.You push against a wall.2.Pushing continuously on the same spot.

3.Holding a chair and walking around the classroom.

NOT considered as WORK

Work (J) = Constant Force (N) x Distance moved in the direction of the force (m)

Unit of measurement of work is (J)

Work can be calculated

W=N x m

Teehan’s triangle

W

F D

1.When is work done?

2.What does this represent (J)?

3.Give one example of Work.

4.How much work is done by a person who uses a force of 27.5N to move a grocery buggy 12.3m?

5.55,0o0J of work is done to move a rock 25m. How much was the force applied?

Questions!

1. Work is done only when a constant force applied on an object, causes the object to move in the same direction as the force applied.

2. Work

3. ---------

4. 338.25J

5. 2,200N

Answers!!!!

You are helping your mom push a heavy shopping cart with a force of 20N and a distance of 20m. What is the amount of work?

W=N x m = 20N x 200M

= 10,000 J 0r 10 KJ (kilo-joules)

EXAMPLE

Pick 3 of your best player per group and let them line up at the back and they must answer the question within 60 Seconds.

1. You and 3 friends apply a combined force of 489.5N to push a piano. The amount of work done is 1762.2J. What distance did the piano move?

ANSWER :

3.6m

Activity

THANKS FOR LISTENING!!!

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