Quiz #5: Work, Power And Energy

10 Questions | By Mcdonellm1 | Updated: Mar 22, 2022 | Attempts: 895

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Questions and Answers

1.

If a mass is at rest, what must be applied to cause it to move?
- A.
  
  Kilograms
- B.
  
  Speed
- C.
  
  Vectors
- D.
  
  Force
2.

If you push on a wall with a force of 30 N, then ______________.
- A.
  
  The wall pushes on you with a force of 30 N.
- B.
  
  The wall moves back 3 cm.
- C.
  
  The wall cannot be forced.
- D.
  
  You are pulled towards the wall.
3.

If you have to push a car forward, what are the forces acting on you?
- A.
  
  The car pushes back on you, gravity pulls you down, the ground pushes up on you, and friction on your shoes pushes forward on you.
- B.
  
  Only gravity.
- C.
  
  Your own muscles push you down.
- D.
  
  No forces act on you.
4.

A person jumps to the ground from a platform 10 feet high. Which of the following is true?
- A.
  
  The person has more kinetic energy before they jump than after they jump.
- B.
  
  The person has less potential energy at the top of the platform than in the air.
- C.
  
  The person's potential energy at the instant they jump is approximately equal to their kinetic energy the instant they land.
- D.
  
  The person's kinetic energy at the instant they jump is approximately double their potential energy the instant they land.
5.

The potential energy of an object is equal to ____________.
- A.
  
  The work done on the object to put the object into its current state.
- B.
  
  The velocity of the object divided by its mass.
- C.
  
  The force of gravity working on the object.
- D.
  
  The size of the object compared to its surface area.
6.

The kinetic energy of an object will increase the most if you __________________.
- A.
  
  Double the velocity of the object
- B.
  
  Double the mass of the object
- C.
  
  Double the potential energy
- D.
  
  Double the temperature of the object
7.

"Power" is defined as _________________.
- A.
  
  The rate at which work is done
- B.
  
  The energy necessary to do work
- C.
  
  The velocity of an object squared
- D.
  
  The sum of potential and kinetic energy
8.

An object with mass "m" kilograms is suspended "h" meters above the ground by a string. If the string is cut, what will the velocity of the object be at the instant it hits the ground?
- A.
  
  The square root of 2gh
- B.
  
  One-half the mass squared
- C.
  
  Two times ghm squared
- D.
  
  H-2gm
9.

Which of the following is NOT a consequence of "The Law of Conservation of Energy"?
- A.
  
  Potential Energy can never be greater than Kinetic Energy
- B.
  
  The energy in a closed system is always constant
- C.
  
  The Kinetic Energy of a dropped object at the instant it hits the ground is roughly equal to the potential energy of the object at the instant it was dropped
- D.
  
  It is not necessary to use Kinematics to discover the velocity of an object accelerated by gravity if you know it's initial Potential Energy and its mass.
10.

As an object goes up a hill at constant velocity, which of the following is NOT true?
- A.
  
  The object's Potential Energy is increasing.
- B.
  
  The object's Kinetic Energy is decreasing.
- C.
  
  The object's Kinetic Energy is constant.
- D.
  
  The object's speed is constant.