NAT Physics MCQs

Acceleration is net force divided by mass.
A=30/6 = 5 m/s².

Weight is W=mg.
W=7×10 = 70 N.

Vertical equilibrium requires normal force to balance weight.
N=mg=10×10 = 100 N.

Uniform acceleration means velocity changes by equal amounts in equal times.
The standard kinematic equations apply.

The runner returns to the starting point, so displacement is zero.
Average velocity is therefore zero.

Inertia is related to mass.
Greater mass means greater resistance to acceleration.

The first law describes inertia.
A net external force is required to change velocity.

For constant mass, Newton's second law becomes F=ma.
It links net force to acceleration.

Interaction forces occur in pairs on different bodies.
They are equal in magnitude and opposite in direction.

Weight depends on gravitational field strength.
Mass remains constant while weight may change with location.

A surface exerts a normal force on an object in contact with it.
Its magnitude is not always equal to weight.

Friction acts tangentially at a contact surface.
It may be static or kinetic.