Advertisements
Advertisements
Question
The work done on an object does not depend on ______.
Options
displacement
applied force
initial velocity of the object
the angle between force and displacement.
Advertisements
Solution
The work done on an object does not depend on the initial velocity of the object.
Explanation:
W = Fs cosθ
According to the formula of work, we come to know that the work done on an object does not depend on the initial velocity of the object.
APPEARS IN
RELATED QUESTIONS
Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?
A coolie does no work against the force of gravity while carrying a luggage on a road.
When is work said to be done by a force?
A bullet of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change in kinetic energy of the ball.
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 __________.
Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.
The work done by a force acting obliquely is given by the formula : W = F cos θ ✕ s. What will happen to the work done if angle θ between the direction of force and motion of the body is increased gradually? Will it increase, decrease or remain constant.
What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?
How many joules are there in 1 mega joule?
Write an expression for the work done against gravity.
Can every force produce work?
Complete the following sentences:
Kilowatt is the unit of ....... and kWh is the unit of
An object is dropped from a height H. when is its
(i) P.E. maximum,
(ii) K.E. maximum,
(iii) P.E. = K.E.?
A woman pulls a bucket of water of total mass 5 kg from a well which is 10 s. calculate the power used by her.
A girl of mass 50 kg runs up a flight of 40 steps in 20 seconds. If each step in 20 cm high, calculate the power developed by the girl. (g= 10 ms-2).
A block of mass 30 kg is pulled up a slope, as shown in diagram with a constant speed, by applying a force of 200 N parallel to slope.
A and B are initial and final positions of block.
(i) Calculate the work done by force in moving the block from A to B.
(ii) Calculate P.E. gained by block. [g=10ms-2]
An electric motor of power 100 W is used to drive the stirrer in a water bath. If 50% of the energy supplied to the motor is spent in stirring the water. Calculate the work done on the water in one minute.
