The work done on an object is equal to the:
a) Force multiplied by the distance
b) Change in energy
c) Mass multiplied by acceleration
d) Kinetic energy
Power is defined as the rate at which work is:
a) Done
b) Transferred
c) Stored
d) Transformed
The SI unit of power is:
a) Watt
b) Joule
c) Newton
d) Meter
If 50 joules of work is done in 10 seconds, the power required is:
a) 5 W
b) 50 W
c) 500 W
d) 5000 W
The work-energy theorem states that the work done on an object is equal to the:
a) Force applied to it
b) Change in its velocity
c) Change in its energy
d) Change in its momentum
Kinetic energy is directly proportional to the:
a) Velocity squared
b) Mass squared
c) Mass
d) Velocity
The formula for kinetic energy is:
a) ½mv²
b) mv
c) mgh
d) ½kx²
The unit of work in the SI system is:
a) Newton
b) Joule
c) Watt
d) Meter
If a person lifts a 10-kg object to a height of 2 meters, the work done is:
a) 20 J
b) 30 J
c) 50 J
d) 100 J
Work is said to be done when:
a) A force moves an object a distance
b) A person applies a force
c) An object is at rest
d) An object is lifted
In an electric circuit, power is calculated as:
a) Current multiplied by voltage
b) Current squared
c) Voltage squared
d) Resistance multiplied by current
The work done by a force is positive if the force and displacement are:
a) In the same direction
b) At right angles
c) In opposite directions
d) Zero
Which of the following is true for an object in motion?
a) It has kinetic energy
b) It has potential energy
c) It has chemical energy
d) It has thermal energy
When lifting an object, the work done depends on:
a) The height lifted
b) The speed of lifting
c) The shape of the object
d) The material of the object
The energy required to do work is called:
a) Force
b) Power
c) Energy
d) Work
The rate at which energy is used is called:
a) Work
b) Power
c) Energy
d) Velocity
Which of the following is a correct expression for power?
a) Power = Work × Time
b) Power = Energy × Time
c) Power = Work / Time
d) Power = Time / Work
If a machine does 500 J of work in 5 seconds, the power output is:
a) 500 W
b) 100 W
c) 50 W
d) 250 W
The kinetic energy of a moving object depends on:
a) Its speed only
b) Its velocity only
c) Its mass and speed
d) Its acceleration
The power needed to lift an object is determined by:
a) The speed of lifting
b) The mass of the object
c) The height to which it is lifted
d) All of the above
The total mechanical energy of a system is:
a) The sum of its potential and kinetic energy
b) The sum of its power and work
c) The rate of energy usage
d) The difference between potential and kinetic energy
A person uses 100 J of work to move an object 5 meters. The force applied is:
a) 50 N
b) 20 N
c) 10 N
d) 5 N
The formula for work is:
a) Work = Force × Distance
b) Work = Force × Mass
c) Work = Energy × Time
d) Work = Mass × Acceleration
The energy stored in an object due to its position is called:
a) Kinetic energy
b) Gravitational potential energy
c) Elastic potential energy
d) Chemical energy
If an object moves twice as fast, its kinetic energy will increase by a factor of:
a) 2
b) 4
c) 8
d) 1
Power can be expressed as the energy converted per unit:
a) Time
b) Force
c) Work
d) Mass
To calculate the work done by a constant force, you need to know:
a) The mass of the object
b) The velocity of the object
c) The displacement of the object and the direction of the force
d) The power exerted
If an object has a speed of 4 m/s and a mass of 2 kg, its kinetic energy is:
a) 16 J
b) 8 J
c) 4 J
d) 2 J
If a person uses a force of 10 N to lift a box 3 meters high, the work done is:
a) 30 J
b) 3 J
c) 10 J
d) 100 J
Which of the following best describes energy?
a) The ability to do work
b) The result of work done
c) The mass of an object
d) The force exerted on an object
Power is measured in:
a) Joules
b) Newtons
c) Watts
d) Meters
The energy used to run an electric fan is an example of:
a) Kinetic energy
b) Thermal energy
c) Electrical energy
d) Chemical energy
