A. always positive
B. always negative
C. positive only for small frictional force
D. positive only for large frictional force
Related Mcqs:
- The work done by friction is__________________?
A. positive
B. negative
C. zero
D. none of these - An elevator weighing 3.5 x 10-6 N is raised to a height of 1000 m in the absence of friction, the work done is_________________?
A. 3.5 x 10-3 J
B. 3.5 x 104 J
C. 3.5 x 106 J
D. 3.5 x 109 J - Work done will be maximum if the angle between the force F and displacement d is______________________?
A. 45°
B. 90°
C. 180°
D. 0°Submitted by: admin
- When a force is parallel to the direction of motion of the body, then work done on the body is_____________________?
A. zero
B. minimum
C. infinity
D. maximum - Work done by variable force is determine by dividing____________________?
A. force into small interval
B. displacement into small interval
C. both force and displacement into small intervals
D. force into small and displacement into large intervals - A ball of mass 0.2 kg is thrown vertically upwards by applying a force by hand. If the hand moves 0.2 m while applying the force and the ball goes up to 2 in height further, find the magnitude of the force. Consider g = 10m/s 2
A. 22N
B. 16N
C. 20N
D. 4NSubmitted by: Huzaifa Naseer
- Propulsion force of a rocket is____________________?
A. non-conservative force
B. conservative force
C. both A and B
D. none of these - The dimension of force is____________________?
A. MLT-2
B. ML2T-2
C. ML2T2
D. ML-2T-2 - A wire is stretched by a force F which causes an extension 1. The energy stored in the wire is____________________?
A. The extension of the wire is proportional to the force applied
B. The weight of the wire is negligible
C. The wire is not stretched beyond its elastic limit
D. The cross sectional area of the wire remains constant - Work done on the body equals to the _____________________?
A. change in its K.E always
B. change in its P.E always
C. change in its K.E and change in its P.E
D. neither change in K.E and nor change in its P.E
