## PEC EPE Exam Numerical Questions for Engineering Mechanics

Click here for PEC EPE Exam MCQ Questions for Engineering Mechanics

### Other PEC EPE Exam Past Paper Questions

**A car of mass 1000 kg is moving with a constant velocity of 20 m/s. Calculate the net force required to maintain this constant velocity.**

Solution:

Net force = Mass * Acceleration (Acceleration is zero for constant velocity)

Net force = 1000 kg * 0 m/sยฒ = 0 N

Answer: Net force = 0 N

**A box of mass 50 kg is placed on an inclined plane with an angle of inclination of 30 degrees. If the coefficient of friction between the box and the inclined plane is 0.2, calculate the force required to prevent the box from sliding down the plane.**

Solution:

Force = Weight component parallel to the plane + Friction force

Weight component parallel to the plane = Weight * Sin(ฮธ)

Friction force = Coefficient of friction * Weight * Cos(ฮธ)

Force = 50 kg * 9.81 m/sยฒ * Sin(30ยฐ) + 0.2 * 50 kg * 9.81 m/sยฒ * Cos(30ยฐ) โ 245.1 N

Answer: Force โ 245.1 N

**A body of mass 5 kg is moving with an acceleration of 2 m/sยฒ. Calculate the net force acting on the body.**

Solution:

Net force = Mass * Acceleration

Net force = 5 kg * 2 m/sยฒ = 10 N

Answer: Net force = 10 N

**A force of 50 N is applied to an object of mass 10 kg for 5 seconds. Calculate the change in momentum of the object.**

Solution:

Change in momentum = Force * Time

Change in momentum = 50 N * 5 s = 250 kg m/s

Answer: Change in momentum = 250 kg m/s

**A force of 800 N is applied to an object of mass 40 kg for 4 seconds. Calculate the change in momentum of the object.**

Solution:

Change in momentum = Force * Time

Change in momentum = 800 N * 4 s = 3200 kg m/s

Answer: Change in momentum = 3200 kg m/s