A level Work, Energy and Power Quiz 1

16 Questions

Quiz Description

A level Work, Energy and Power Quiz. In physics, work is the process of energy transfer to the motion of an object via application of a force, often represented as the product of force and displacement. A force is said to do positive work if (when applied) the force has a component in the direction of the displacement of the point of application. A force does negative work if the force has a component opposite to the direction of the displacement at the point of application of the force.

Energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat, the object.[note 1] Energy is a conserved quantity; the law of conservation of energy states that energy can be converted in form, but not created or destroyed. The SI unit of energy is the joule, which is the energy transferred to an object by the work of moving it a distance of 1 metre against a force of 1 newton.

Power is the amount of energy transferred or converted per unit time. In the International System of Units, the unit of power is the watt, equal to one joule per second. In older works, power is sometimes called activity.[1][2][3] Power is a scalar quantity.

1:

When a body falls freely under gravity, then the work done by the gravity is ___________


Correct
  • 1:
    Positive
  • 2:
    Negative
  • 3:
    Zero
  • 4:
    Infinity
2:

When a gas filled in a cylinder fitted with a movable piston is allowed to expand, the work done by the gas is positive.


Correct
  • 1:
    True
  • 2:
    False
  • 3:
    True and False
  • 4:
    None
3:

When a body slides against a rough horizontal surface, the work done by friction is ___________


Correct
  • 1:
    Positive
  • 2:
    Zero
  • 3:
    Negative
  • 4:
    Constant
4:

When a body is lifted, the work done by the gravitational force is positive.


Correct
  • 1:
    True
  • 2:
    False
  • 3:
    True and False
  • 4:
    Not understood
5:

For a body moving in a circular path, the work done by the centripetal force is ___________


Correct
  • 1:
    Negative
  • 2:
    Positive
  • 3:
    Constant
  • 4:
    Zero
6:

When a coolie walks on a horizontal platform with a load on his head, the work done by the coolie on the load is zero.


Correct
  • 1:
    True
  • 2:
    False
  • 3:
    True and False
  • 4:
    Not clear
7:

 A gardener pushes a lawn roller through a distance of 20m. If he applies a force of 20kg weight in a direction inclined at 60° to the ground, find the work done by him. (g=9.8m/s^2)


Correct
  • 1:
    400J
  • 2:
    1960J
  • 3:
    250J
  • 4:
    2514J
8:

A person is holding a bucket by applying a force of 10N. He moves a horizontal distance of 5m and then climbs up a vertical distance of 10m. Find the total work done by him?


Correct
  • 1:
    50J
  • 2:
    150J
  • 3:
    100J
  • 4:
    200J
9:

A moving hammer drives a nail into the wood. It has kinetic energy.


Correct
  • 1:
    True
  • 2:
    False
  • 3:
    True and False
  • 4:
    None
10:

A bullet fired from a gun can pierce a target due to its ___________


Correct
  • 1:
    Mechanical energy
  • 2:
    Heat energy
  • 3:
    Kinetic energy
  • 4:
    Acceleration
11:

By how much does kinetic energy increase if the momentum is increased by 20%


Correct
  • 1:
    55%
  • 2:
    66%
  • 3:
    44%
  • 4:
    77%
12:

Calculate the energy loss in a perfectly inelastic collision if the mass of the object is 40kg with velocity 4m/s hits the object of mass 60kg with velocity 2m/s.


Correct
  • 1:
    440J
  • 2:
    110J
  • 3:
    392J
  • 4:
    48J
13:

Calculate the final kinetic energy of a block of mass if the mass of the block is 10kg and has a constant velocity of 10m/s. The block of mass is subjected to a retarding force of F=0.1J/m


Correct
  • 1:
    275J
  • 2:
    250J
  • 3:
    475J
  • 4:
    450J
14:

What is the average power required to lift a mass of 100kg to a height of 50m in 50 seconds?


Correct
  • 1:
    980
  • 2:
    100
  • 3:
    50
  • 4:
    5000
15:

What is the power of the engine when the velocity of the car is v, mass m, acceleration a, and external resistance R


Correct
  • 1:
    (R-ma)v
  • 2:
    (R+ma)v
  • 3:
    mav
  • 4:
    Rv
16:

A ball is thrown from a height of 20 m vertically downward and has an initial velocity of v20. As the stone collides with the ground 50% of its energy is lost and bounce back to the same height. What is the initial velocity?


Correct
  • 1:
    28m/s
  • 2:
    20m/s
  • 3:
    10m/s
  • 4:
    14m/s

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A level Work, Energy and Power Quiz 1
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