The unit of work is Joule. The other physical quantity that has the same unit is ___________.

• power

• velocity

• energy

• force

Gravitational potential energy is the energy of an object due to its __________.

• mass

• position

• motion

• weight

When a body slides against a rough horizontal surface, the work done by friction is _____________.

• zero

• positive

• negative

• none of the above

When the direction of applied force and the direction in which the object moves are perpendicular, then __________.

• no power is used

• no work is done

• power is used

• work is done

Which statement relates to the principle of conservation of energy?

• Energy can be created.

• Energy can be transformed.

• Energy can be destroyed.

• All of the above.

Which of these statements is TRUE for uniform circular motion?

• The direction of linear velocity is constantly changing.

• The radius of circular motion is constantly changing.

• The magnitude of linear velocity is constantly changing.

• The magnitude of centripetal acceleration is constantly changing.

Centripetal acceleration is always directed __________.

• towards the center of the circular path.

• away from the center of the circular path.

• in the direction of the object’s motion.

• in the opposite direction of the object’s motion.

Consider a particle moving with constant speed such that its direction of acceleration is always perpendicular to its velocity. The particle is moving in a _________.

• straight line.

• circle.

• parabolic path.

• parabolic path.

All of the following are symbols for parameters in rotational motion EXCEPT ________.

• θ

• ω

• α

• a

Given τ = −30.4 N m.

Based on this statement, the turning effects of a rigid body is _______.

• upwards.

• clockwise.

• downwards.

• anticlockwise.