4. work = force * displacement
=F*S
Unit = N*m
=Nm Or Joule
5. Examples
Hitting the ball
Pushing the troli
Pulling the bucket of water from the well
Kicking the ball
6. What is the
amount of work
done when a
cup of tea of
mass 0.25 is
lifted to a height
of 40cm?
7. Work, W = F * S
The gravitational force of attraction on the cup of tea or its weight is,
F = mg
=0.25 * 10
=2.5 N
Acceleration due to gravity,g =10 m/s^2
S= 40 cm = 0.4 m
W = F * S
= 2.5 * 0.4
= 1 joule
