The work done by the external forces on a system equals the change in:
1. total energy
2. kinetic energy
3. potential energy
4. none of these

Subtopic: Â Concept of Work |
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A small block of mass $$m$$ is kept on a rough inclined surface of inclination $$\theta$$ fixed in an elevator. The elevator goes up with a uniform velocity $$v$$ and the block does not slide on the wedge. The work done by the force of friction on the block in time $$t$$ will be:
1. zero
2. $$mgvt ~cos^2\theta$$
3. $$mgvt ~sin^2\theta$$
4. $$mgvt ~sin2\theta$$

Subtopic: Â Concept of Work |
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A block of mass $$m$$ slides down a smooth vertical circular track. During the motion, the block is in:
1. vertical equilibrium
2. horizontal equilibrium
4. none of these

Subtopic: Â Concept of Work |
From NCERT
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A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle. The motion of the particle takes place in a plane. It follows that
a. its velocity is constant
b. its acceleration is constant
c. its kinetic energy is constant
d. it moves in a circular path
Choose the correct option:
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. All of these

Subtopic: Â Concept of Work |
Â 62%
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Consider two observers moving with respect to each other at a speed v along a straight line. They observe a block of mass m moving a distance I on a rough surface. The following quantities will be same as observed by the two observers

1. kinetic energy of the block at time t

2. work done by friction

3. total work done on the block

4. acceleration of the block

Subtopic: Â Concept of Work |
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No work is done by a force on an object if:

 a. the force is always perpendicular to its velocity. b. the force is always perpendicular to its acceleration. c. the object is stationary but the point of application of the force moves on the object. d. the object moves in such a way that the point of application of the force remains fixed.

Choose the correct option:

 1 (a), (b), (c) 2 (a), (c), (d) 3 (b), (c), (d) 4 all of the above

Subtopic: Â Concept of Work |
From NCERT
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