MDCAT Pakistan · Physics

Mechanics, Work, Energy and Gravitation

9 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 9 questions

  1. A projectile is launched from ground level with initial velocity v0 = 40 m/s at an angle of 30 degrees above the horizontal. What is its horizontal range? (Take g = 10 m/s^2, sin(60°) = 0.866)
  2. A 2.0 kg block sliding on a horizontal frictionless surface at 6.0 m/s collides with and compresses a horizontal spring with spring constant k = 800 N/m. What is the maximum compression of the spring?
  3. What is the escape velocity from the surface of a spherical planet having twice the mass of Earth (2 M_E) and twice the radius of Earth (2 R_E)?
  4. A car of mass 1000 kg rounds an unbanked circular curve of radius 50 m on a flat road. If the coefficient of static friction is 0.50, what is the maximum safe speed without skidding? (g = 10 m/s^2)
  5. If the linear momentum of an object is increased by 50 percent, by what percentage does its kinetic energy increase?
  6. A solid cylinder and a thin-walled hollow cylinder of identical mass and radius roll down an inclined plane from rest without slipping. Which reaches the bottom first?
  7. An elevator of total mass 800 kg accelerates upward at 2.0 m/s^2. What is the tension in the supporting cable? (Take g = 9.8 m/s^2)
  8. Under what condition is the work done by a constant force on a moving particle equal to zero?
  9. What is the gravitational potential energy of a satellite of mass m in a circular orbit of radius r around a planet of mass M?

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