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Questions
Explain the following:
It is easier to turn a steering wheel with large diameter than a steering wheel with small diameter.
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Solution
RELATED QUESTIONS
In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east, as shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.
Give reasons for the following A teacher moving around in the class is doing work but a child standing and reading a book is not doing any work.
Choose one or more correct alternatives.
Joule is the unit of ______.
- force
- work
- power
- energy
P, Q and R are three forces which act as shown in fig.
The point O lies in the same plane. Given, P = Q = R = 10N
(i) Which force has the least moment about O? Give a reason.
(ii)Which force has the greatest moment about O? Give a reason.
Complete the following sentences:
The SI unit of work is ....... and of power is .......
State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.
Give an example
Light energy changes to electrical energy.
A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?
A force is applied on a body of mass 20 kg moving with a velocity of 40 ms−1. The body attains a velocity of 50 ms−1 in 2 seconds. Calculate the work done by the body.
