Pakistan MCQs

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

Use s=ut+½at² with u=0.
S=½×2×25 = 25 m.

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

Use s=ut+½at².
S=10×5+½×2×25 = 50+25 = 75 m.

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

Use v²=u²+2as.
100-16 = 42a, so a=2 m/s².

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

Starting from rest, v=gt.
V=10×2 = 20 m/s.

At terminal velocity, net force is zero.
The object then moves with constant velocity.

Use s=½gt².
S=½×10×9 = 45 m.

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

At maximum height, final vertical velocity is zero.
0=20-10t gives t=2 s.