2.6.2 Gravitational potential energy and conservation of energy Quiz: Pearson Edexcel Physics, Unit 2

The 20 questions

1. The change in gravitational potential energy of a mass m raised through height h near Earth's surface is:

   • (1/2) m g delta h
   • m g delta h
   • m v delta h
   • m g h^2

2. According to energy conservation, the total energy of an isolated system is always what?

   • Zero
   • Decreasing
   • Increasing
   • Constant

3. A 2.0 kg object is raised through 5.0 m. What is its gain in gravitational potential energy, taking g = 9.8 m s^-2?

   • 49 J
   • 10 J
   • 196 J
   • 98 J

4. A 0.50 kg ball is dropped from 10 m and air resistance is ignored. What is its speed just before it hits the ground, taking g = 9.8 m s^-2?

   • 7.0 m s^-1
   • 14 m s^-1
   • 196 m s^-1
   • 9.8 m s^-1

5. A 500 kg roller coaster starts from rest and descends 20 m without friction. What is its speed at the bottom, taking g = 9.8 m s^-2?

   • 20 m s^-1
   • 196 m s^-1
   • 9.8 m s^-1
   • 40 m s^-1

6. A 0.20 kg ball is dropped from 5.0 m and reaches a speed of 8.0 m s^-1 just before hitting the ground. How much energy is lost to air resistance, taking g = 9.8 m s^-2?

   • 16.2 J
   • 3.4 J
   • 6.4 J
   • 9.8 J

7. A 1.0 kg ball is thrown vertically upwards at 10 m s^-1 from the ground. How high does it rise, taking g = 9.8 m s^-2 and ignoring air resistance?

   • 5.1 m
   • 50 m
   • 1.0 m
   • 10 m

8. A pendulum bob is released from rest at a height of 0.20 m above its lowest point. What is its speed at the lowest point, taking g = 9.8 m s^-2?

   • 4.0 m s^-1
   • 0.20 m s^-1
   • 0.98 m s^-1
   • 2.0 m s^-1

9. Without air resistance, which total energy quantity remains constant for a projectile?

   • Potential energy
   • Thermal energy
   • Kinetic energy
   • Mechanical energy

10. A 60 kg skier descends a slope with a vertical drop of 10 m, starting from rest. A friction force of 40 N acts over a slope length of 30 m. What is the speed at the bottom, taking g = 9.8 m s^-2?

    • 20 m s^-1
    • 12.5 m s^-1
    • 14 m s^-1
    • 9.8 m s^-1

11. Why is a rolling sphere slower than a sliding block at a slope's base?

    • Lower mass
    • Rotational kinetic energy
    • Air resistance
    • Frictional heat loss

12. In free fall without drag, which quantity does final speed NOT depend on?

    • Mass of object
    • Height fallen
    • Gravitational field strength
    • Initial height

13. A 2.0 kg object slides down a frictionless curved track from a height of 3.0 m. What is its kinetic energy at the bottom, taking g = 9.8 m s^-2?

    • 29 J
    • 6.0 J
    • 98 J
    • 59 J

14. A pendulum of length 1.0 m is released from rest at an angle that raises the bob by 0.10 m. What is the bob's speed at the lowest point, taking g = 9.8 m s^-2?

    • 0.10 m s^-1
    • 2.0 m s^-1
    • 1.4 m s^-1
    • 0.98 m s^-1

15. A 3.0 kg object is raised 4.0 m at constant speed. What is the change in its gravitational potential energy?

    • 30 J
    • 118 J
    • 235 J
    • 12 J

16. When falling through air, GPE loss exceeds KE gain because energy transfers to what?

    • Nuclear energy
    • Elastic energy
    • Thermal energy
    • Electrical energy

17. A 0.40 kg ball rises 1.5 m after being hit upwards. What is its gain in gravitational potential energy, taking g = 9.8 m s^-2?

    • 5.9 J
    • 0.6 J
    • 2.6 J
    • 15 J

18. A 0.50 kg ball starts from rest at the top of a frictionless ramp 8.0 m high. What is its speed at the bottom, taking g = 9.8 m s^-2?

    • 25 m s^-1
    • 4.0 m s^-1
    • 12.5 m s^-1
    • 9.8 m s^-1

19. A 1.5 kg object is lowered by 6.0 m. What is the change in its gravitational potential energy, taking g = 9.8 m s^-2?

    • 88 J
    • 147 J
    • 9.8 J
    • 44 J

20. A 0.30 kg ball is thrown upwards and rises 4.0 m with no air resistance. What was its kinetic energy at launch, taking g = 9.8 m s^-2?

    • 12 J
    • 6.0 J
    • 24 J
    • 1.2 J

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