Q14. a) Define work. Give SI unit of work done.
b) What will be work done if displacement of the object is perpendicular to the
direction of force.
c) Calculate the work done in pushing a cart through a distance of 50m against the
force of friction equal to 250N. Also state the type of work done.
Answers
Answer:
What is work?
Answer
In physics, work is the energy transferred to or from an object via the application of force along a displacement. In its simplest form, it is often represented as the product of force and displacement
S.I. unit of work?
Answer
Joule
What will be the work done if displacement of the object is perpendicular to the direction of force?
Answer
Work(W) = Force(F) × Displacement(s)
or
W = Fs
For eg-
Find the Work Done with the formula W = Fs if the displacement is 100m and the force is 70N ---
Let's try to solve this with the formula we have been told to ---
W = Fs
W = 100 × 70
W = 700 Joule
Calculate the work done in pushing a cart through a distance of 50m against the
force of friction equal to 250N. Also state the type of work done.
Answer
We are given that
Force(F) = 250N, displacement(s) = 50w
∴ Work done = F × S
=> 250 × 50
=> 12500 Joule
Here, the work done is negative.
Explanation: