Advertisements
Advertisements
Question
Why is a jack screw provided with a long arm?
Advertisements
Solution
A jack screw is provided with a long arm in order to have the effortless than the load. According to the principle of moments, load x load arm = effort x effort arm. So, if the load arm is more, then the effort will be more than the load.
APPEARS IN
RELATED QUESTIONS
Write an expression for the work done when a force is acting on an object in the direction of its displacement.
.A man raises a box of mass 50kg to a height of 2m in 20s, while another man raises the same box to the same height in 50s. Compare:
(i) the work done, and
(ii) the power developed by them.
Fill in the blank with suitable word :
The work done on a body moving in a circular path is __________
Fill in the blank with suitable word :
1 joule is the work done when a force of 1 __________ moves an object through a distance of one __________ in the direction of __________.
Give two examples of couple actions in our daily life.
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.
On what factors does the work done by a force depend?
Can work done be zero even if force acts on the body?
