WORK

• Science
• Secondary Education

SCIENCE 

GRADE-9

OCT 22, 2020

Ms.Famin

Who is doing work here?

OBJECTIVES 

1. Relate energy and work

2. solve for work 

INTERPRET ??

work 

Work is the transfer of energy that occurs when a force makes an object move in the direction of the force while the force acts on the object.

which is NOT an example of work?

1. holding books in your arms
2. lifting a box from a table
3. placing a bowl on a shelf
4. pushing a cart across a room

NO WORK DONE 

WORK DONE 

CHALLENGE- A coach sets up a tug-of -war between two evenly matched teams. both teams pull against the rope as hard as they can , but the rope does not move. Is any work being done? Justify your answer

predict ?

work depends 

Force applied to the object in Newtons

Distance(meter-m)of the object moved during the time 

UNIT OF WORK IS JOULES 

practice 

A student lifts a bag from the floor to his or her shoulder 1.2 m above the floor, using a force of 50 N. How much work does the student do on the bag?

A student pulls out his or her chair in order to sit. The student pulls the chair 0.75 m with a force of 20 N HOW MUCH WORK DOES HE OR SHE DO?

1. 26 joules
2. 15
3. 15 Joules
4. 0.037 joules

Humpty Dumpty weighs 400 N. he falls off a wall 3m high. How much work was done by gravity on Humpty Dumpty?

A mover lifts a 12-kg box straight up 1.5 m. How much work is done on the box?

Did you enjoy the lesson?

w= f