NAT MCQs

Displacement is a vector from initial to final position.
It can be zero even when distance traveled is not zero.

Centripetal acceleration changes the direction of velocity.
It always points radially inward.

Distance is a scalar and depends on the actual path.
It is always nonnegative.

Centripetal force is not a separate force type.
It may be supplied by tension, friction, gravity, or another force.

Average speed uses total path length.
It does not depend on direction.

A particle in translational equilibrium has no acceleration.
It may be at rest or moving at constant velocity.

Average velocity is a vector based on net displacement.
A round trip can have zero average velocity.

In ideal free fall, air resistance is neglected.
All objects then have the same gravitational acceleration locally.

Slope gives change in displacement per unit time.
That is the definition of velocity.

Average speed equals distance divided by time.
120/10 = 12 m/s.

Slope gives change in velocity per unit time.
That is acceleration.

Displacement is 14-2 = 12 m.
Average velocity is 12/4 = 3 m/s.