GIKI Engineering Computing MCQs

The net work on an object changes its kinetic energy.
This relation is valid for the total work of all forces.

Conservative forces transfer energy between kinetic and potential forms.
Nonconservative work changes total mechanical energy.

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.

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

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

Use a=F/m.
A=12/4 = 3 m/s².

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

Centripetal acceleration is v²/r.
A=100/20 = 5 m/s².

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

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

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