Ücretsiz Kullanmaya Başla

Mechanical energy Knowledge-Based Practice

Physics · Energy, Work & Power · Physics · Forms of Energy & Conservation

6 Physics practice questions on Mechanical energy. Questions that assess core concepts and understanding.

Layout:

Choose how questions appear in the preview and test.

Preview the questions below, then start to answer and see your results.

Questions

  1. 1.

    A crate is hoisted vertically upward at a constant speed by a cable. How does the total mechanical energy of the crate-Earth system change during this upward motion?

    • A) It remains constant because the kinetic energy of the crate does not change.
    • B) It increases because gravitational potential energy increases while kinetic energy remains constant.
    • C) It decreases because the crate must expend energy to overcome gravity.
    • D) It remains constant because mechanical energy is conserved in every physical process.
  2. 2.

    Which of the following statements correctly describes the total mechanical energy of an object launched into projectile motion near Earth's surface, assuming air resistance is negligible?

    • A) It remains constant throughout the trajectory because gravity is a conservative force.
    • B) It reaches a minimum value at the peak of the trajectory where the vertical velocity is zero.
    • C) It continuously decreases during the ascent and increases during the descent.
    • D) It increases continuously because the gravitational force continually accelerates the object.
  3. 3.

    A block attached to an ideal horizontal spring with a spring constant of 800 N/m oscillates on a frictionless surface. At an instant when the spring is compressed by 0.10 m and the kinetic energy of the block is 18 J, what is the total mechanical energy of the system?

    • A) 14 J
    • B) 26 J
    • C) 22 J
    • D) 58 J
  4. 4.

    A toy car has an initial mechanical energy of 50 J at point A. While moving along a rough track to point B, friction does -12 J of work on the car. What is the total mechanical energy of the car at point B?

    • A) 62 J
    • B) 50 J
    • C) 12 J
    • D) 38 J
  5. 5.

    A 2.0 kg cart travels along a frictionless track. At point X, the cart has a speed of 4.0 m/s and a gravitational potential energy of 65 J. What is the speed of the cart at point Y, where its gravitational potential energy is 32 J?

    • A) 7.0 m/s
    • B) 5.7 m/s
    • C) 9.0 m/s
    • D) 4.0 m/s
  6. 6.

    A sled with a total mechanical energy of 850 J slides down a frictionless hill. At a certain point along the slope, its gravitational potential energy relative to the base is 320 J. What is the kinetic energy of the sled at this point?

    • A) 530 J
    • B) 1170 J
    • C) 320 J
    • D) 210 J

Answers and step-by-step solutions appear after you finish the test.