NAT MCQs

Net work equals the change in kinetic energy.
Kf=20+80 = 100 J.

ΔK=½m(v²-u²).
With m=2, ΔK=49-9 = 40 J.

Momentum is p=mv.
P=6×4 = 24 kg·m/s.

Impulse equals change in momentum.
J=3(8-2)=18 N·s.

Impulse is FΔt for constant force.
50×0.2 = 10 N·s.

Chemistry examines what matter is made of and how it behaves.
It also studies energy changes accompanying chemical processes.

Matter includes solids, liquids, gases, and plasma.
It is composed of atoms, molecules, or ions.

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.

Near Earth's surface, gravitational potential energy is mgh.
Only changes in potential energy are physically significant.

Power measures how quickly work is done.
Its SI unit is the watt.