IT IS JUST AN INTRODUCTION OF THE TOPIC WORK

1. WORK… ENERGY… POWER…
BY
SARANYA KRISHNAN K V
B.Ed PHYSICAL SCIENCE
GBCTE THALASSERY

4. Work is said to be done only when a body
undergoes displacement under the action of force.

5. 30 kg
50 kg
50 m
50 m
A boy pushed an object of mass 30 kg horizontally across the floor
through 50 m. another boy pushed an object of mass 50 kg across
the same floor through 50 m. both of them gave same speed.
Answer the following questions?
a. Who applied greater force ?
b. In which case the work is greater ?
c. Here which factor influences work ?

6. A boy pushed an object of mass 20 kg across the horizontal floor
through 20 m. another boy pushed the same object through 30 m,
on the same floor with same speed. Answer the following
questions.
30
kg
20 m
30 m
30 kg
a. Who pushed greater distance here?
b. What about the force applied?
c. Who did the greater work?
d. Which is the factor influencing work here?

7. What are the factors influencing work done by
force?
Work = Force Displacementˣ
W = F sˣ

8. When a force of 10 N is applied continuously on a
body , and its displacement is 2m. Find out the
magnitude of work done by force?
F = 10 N
S = 2 m
W = ?
= FˣS
= 10 N ˣ2 m
= 20 N m