2.6.1 Work and kinetic energy Quiz: Pearson Edexcel Physics, Unit 2

The 20 questions

1. The work done by a constant force is equal to:

   • The force squared multiplied by the displacement.
   • The force divided by the displacement.
   • The force multiplied by the displacement in the direction of the force.
   • The force added to the displacement.

2. The SI unit of work is the:

   • Joule (J)
   • Kilogram metre per second (kg m s^-1)
   • Newton (N)
   • Watt (W)

3. The kinetic energy of a body of mass m moving at speed v is:

   • m v^2
   • (1/2) m v
   • (1/2) m v^2
   • m v

4. The work done by a force that acts perpendicular to the direction of motion is:

   • Zero
   • Equal to the momentum
   • Equal to the force times the distance
   • Equal to the kinetic energy

5. A 5.0 kg object moves at 4.0 m s^-1. What is its kinetic energy?

   • 10 J
   • 40 J
   • 20 J
   • 80 J

6. A 20 N force acts at 60 degrees to the horizontal and the object moves 3.0 m horizontally. What work does the force do?

   • 60 J
   • 30 J
   • 52 J
   • 17 J

7. A 1000 kg car speeds up from 10 m s^-1 to 20 m s^-1 with no friction. What is the work done by the engine?

   • 1.0 x 10^5 J
   • 1.5 x 10^4 J
   • 1.5 x 10^5 J
   • 3.0 x 10^5 J

8. A block is pulled 4.0 m by a 15 N force, and a friction force of 5.0 N acts opposite to the motion. What is the work done against friction?

   • 15 J
   • 40 J
   • 60 J
   • 20 J

9. A car has 2.0 x 10^5 J of kinetic energy and brakes with a constant friction force of 8000 N. What is the stopping distance?

   • 2.5 m
   • 25 m
   • 250 m
   • 16 m

10. A 2.0 kg object has momentum 6.0 kg m s^-1. What is its kinetic energy?

    • 18 J
    • 3.0 J
    • 9.0 J
    • 36 J

11. The speed of a body is doubled. By what factor does its kinetic energy change?

    • 2 times
    • 4 times
    • 8 times
    • half

12. A 3.0 kg block accelerates from rest to 6.0 m s^-1 over a distance of 4.0 m under a constant force. What is the force?

    • 4.5 N
    • 27 N
    • 13.5 N
    • 54 N

13. The work done by a variable force over a displacement can be found from:

    • The area under a force-displacement graph.
    • The area under a velocity-time graph.
    • The intercept of a force-displacement graph with the force axis.
    • The gradient of a force-displacement graph.

14. A sledge is pulled with a rope of tension 50 N at 30 degrees to the ground over a distance of 10 m. What is the work done by the tension?

    • 433 J
    • 250 J
    • 500 J
    • 866 J

15. A 1500 kg car brakes from 25 m s^-1 and a friction force of 6000 N acts. What is the stopping distance?

    • 78 m
    • 25 m
    • 39 m
    • 156 m

16. Which statement about work and kinetic energy is correct?

    • The net work done is always equal to the change in momentum.
    • Kinetic energy is unchanged by a net force.
    • The net work done on a body equals its total energy.
    • The net work done on a body equals its change in kinetic energy.

17. A 1.0 kg object moving at 10 m s^-1 is brought to rest by a constant force over 5.0 m. What is the magnitude of the force?

    • 10 N
    • 5.0 N
    • 20 N
    • 50 N

18. A 40 N force is applied at an angle of 0 degrees to the displacement over a distance of 2.5 m. What is the work done?

    • 100 J
    • 16 J
    • 80 J
    • 0 J

19. A body moves in a circle at constant speed. What is the work done by the centripetal force?

    • Equal to the centripetal force times the radius
    • Equal to the kinetic energy
    • Zero
    • Equal to the momentum times the radius

20. A 2.0 kg object increases its speed from 3.0 m s^-1 to 5.0 m s^-1. What is the net work done on it?

    • 32 J
    • 10 J
    • 16 J
    • 8.0 J

Related quizzes

• Equations for uniformly accelerated motion Quiz · 2.1.1 · 20 questions
• Displacement, velocity and acceleration graphs Quiz · 2.1.2 · 20 questions
• Scalars, vectors and resolving and adding vectors Quiz · 2.2.1 · 20 questions
• Independence of projectile motion Quiz · 2.2.2 · 20 questions
• Free-body diagrams and Newton's first and second laws Quiz · 2.3.1 · 20 questions
• Weight, gravitational field strength and terminal velocity Quiz · 2.3.2 · 20 questions
• Newton's third law and momentum Quiz · 2.4.1 · 20 questions
• Conservation of linear momentum in one dimension Quiz · 2.4.2 · 20 questions
• Moments, centre of gravity and the principle of moments Quiz · 2.5.1 · 20 questions
• Gravitational potential energy and conservation of energy Quiz · 2.6.2 · 20 questions