NAT MCQs

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

Acceleration is F/m = 4 m/s².
Change in velocity is at=4×3 = 12 m/s.

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

The net force is 80-20 = 60 N.
Acceleration is 60/15 = 4 m/s².

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.

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

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

Use s=½gt².
S=½×10×9 = 45 m.

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

Use v²=u²-2gh with v=0.
0=400-20h, so h=20 m.