Title: 1.3 Mechanical energy quiz

Potential energy 1

Q: A body of mass m is lifted at a location with the local gravitational acceleration g in time t with velocity v by height h. On which quantities depends the potential energy PE of the lifted body?
- mass m (correct)
- gravitational factor g (correct)
- time t
- velocity v
- height h (correct)

Potential energy 2

Q: In a place with the local gravitational acceleration 10 m/s^2, a body of mass 3 kg is lifted by 4 m. What is the potential energy of the body?
- 120 J (correct)
- 7.5 J
- 17 J
- 60 J
- 240 J

Potential energy 3

Q: In a place with the local gravitational acceleration of 10 m/s^2, an object with a mass of 6 kg is lifted and then has a potential energy of 120 J. To what height was the object lifted?
- 3 m
- 1 m
- 6 m
- 12 m
- 2 m (correct)

Potential energy 3

Q: Of two objects of equal mass, object 2 has twice the speed of object 1. Which of the following statements is correct?
- Object 2 has four times the kinetic energy of object 1. (correct)
- Object 2 has twice the kinetic energy of object 1.
- Object 2 has eight times the kinetic energy of object 1.
- Object 2 has three times the kinetic energy of object 1.
- No statement can be made about the ratio of the kinetic energies of the two objects.

Potential energy 3

Q: An object with a mass of 3 kg is brought to a speed of 4 m/s. What is the kinetic energy of the object?
- 24 J (correct)
- 12 J
- 48 J
- 14 J
- 30 J

Potential energy 3

Q: An object with a mass of 5 kg has a kinetic energy of 10 J. What is the velocity of the object?
- 2 m/s (correct)
- 4 m/s
- 10 m/s
- 5 m/s
- 6 m/s

Potential energy 3

Q: A pendulum of length l and mass m swings back and forth without any losses of energy. Which of the following statements are correct?
- The kinetic energy of the system fluctuates periodically. (correct)
- The potential energy of the system fluctuates periodically. (correct)
- The total energy of the system fluctuates periodically.
- The potential energy of the system is always constant.
- The kinetic energy of the system is always constant.
- The total energy of the system is always constant. (correct)

[Image: Pendulum]