Advertisements
Advertisements
Question
How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?
Advertisements
Solution
Force, (F) = 2N
Distance travelled by the body, (S) = 0.1 m
We have a relation as, W = FS
So,
W = 2 × 0.1
= 0.2 J
Therefore , the work done is 0.2 J
APPEARS IN
RELATED QUESTIONS
Define the term energy.
A boy of weight 40 kgf climbs up the 15 steps, each 15 cm high in 10 s and a girl of weight 20 kgf does the same in 5 s. Compare:
- the work done, and
- the power developed by them. Take g = 10 N kg-1.
MULTIPLE CHOICE TYPE
In an electric cell which in use, the change in energy is from:
What are the units of (a) work, and (b) energy?
What is the relationship between Nm and dyne cm?
A block of mass 20 kg is pulled up a slope (fig.12) with a constant speed by applying a force of 500 N parallel to the slope. A and B are initial and final positions of the block.
(a) Calculate the work done by the force in moving the block from A and B.
(b) Calculate the potential energy gained by the block.
Define Translational motion.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A green plant is carrying out photosynthesis.
