Pakistan MCQs

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

For conservative forces, work around a closed path is zero.
Gravity and ideal spring force are examples.

Weight is W=mg.
W=7×10 = 70 N.

Linear momentum is a vector quantity p=mv.
Its direction is the direction of velocity.

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

Impulse equals force integrated over time.
For constant force, J=FΔt=Δp.

Opposing forces subtract.
Net force = 50-20 = 30 N.

Internal forces cancel in pairs within a system.
With no net external impulse, total momentum remains constant.

Use a=F/m.
A=12/4 = 3 m/s².

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

Centripetal force is mv²/r.
F=2×36/4 = 18 N.

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