GIKI Physics MCQs

Energy transferred is Pt.
1000×20 = 20,000 J.

All isolated collisions conserve momentum.
Elastic collisions also conserve total kinetic energy.

The objects share a common final velocity.
Momentum is conserved, but kinetic energy is not.

Torque depends on force, lever arm, and angle.
It is the rotational counterpart of force.

Torque magnitude equals force times perpendicular lever arm.
A larger moment arm produces greater turning effect.

Angular velocity describes how fast and in which sense an object rotates.
Its SI unit is rad/s.

Constant velocity means zero acceleration and zero net force.
The normal force therefore equals the person's weight, 600 N.

Angular acceleration measures how quickly rotational speed changes.
Its SI unit is rad/s².

Work transfers energy when a force acts through a displacement.
Only the component of force along displacement contributes.

Moment of inertia depends on mass and its distribution about the axis.
Mass farther from the axis increases it.

Kinetic energy depends on mass and speed.
For translational motion, K=½mv².

A body in rotational equilibrium has no angular acceleration.
Clockwise and counterclockwise torques balance.