8.1 Work and Power

• What is the definition of work in physics?

  Energy transfer by force
• What is the formula for calculating power?

  Power = Work / Time
• Force is measured in newtons (N).


  True
• What happens to work done if force and displacement are in opposite directions?

  Work done is negative
• What three variables are used in the work formula?

  Work, force, displacement
• Work is the energy transferred when a force causes movement.


  True
• The formula for work is Work = Force \times Displacement
• If a force of 50 N is applied to an object and it moves 4 m in the direction of the force, the work done is 200 J
• What unit is used to measure power?

  Watts (W)
• Match the concept with its description:

  Power ↔️ Rate at which work is done

  Work ↔️ Energy transferred by a force

  Time ↔️ Duration over which work is done
• What is the unit of measurement for force?

  Newtons
• What variable is measured in meters when calculating work?

  Displacement
• What is the unit of measurement for force?

  Newtons
• What is the unit of measurement for power?

  Watts
• What is the formula for power?

  $Power =$$\frac{Work}{Time}$
• Power is measured in watts (W).

  True
• Work is measured in joules (J).

  True
• If a force of 50 N is applied to an object and it moves 4 m, what is the work done?

  200 joules
• Power is measured in watts (W).

  True
• What unit is used to measure work?

  Joules
• The amount of work done depends on the force applied and the distance the object moves in the direction of the force.
• To calculate work, you need to know the force in newtons and the displacement in meters.
• What unit is used to measure force?

  Newtons
• What are the two factors that determine the work done on an object?

  Force and displacement
• If the force and displacement are in opposite directions, the work done is negative.


  True
• The formula for power is Power = \frac{Work}{Time}
• If 100 joules of work is done in 5 seconds, the power is 20 W
• What is the unit of measurement for work?

  Joules
• If a force of 50 N is applied to an object and it moves 4 m in the direction of the force, the work done is 200 joules.
• If a force of 50 N is applied to an object and it moves 4 m in the direction of the force, the work done is 200 joules.
• If a force of 50 N is applied to an object and it moves 4 m in the direction of the force, the work done is 200 joules.
• If a force of 50 N is applied to an object and it moves 4 m in the direction of the force, the work done is 200 joules.
• If 100 joules of work is done in 5 seconds, the power is 20 watts.
• The power is the rate at which work is done or energy is transferred
• If 100 joules of work is done in 5 seconds, what is the power?

  20 watts
• Force is measured in newtons
• Work is measured in joules
• The formula to calculate work is Force times displacement.
• Work is the transfer of energy when a force causes an object to move.
• Match the concept with its description and units:

  Work ↔️ Energy transfer by force, joules (J)

  Force ↔️ The push or pull applied, newtons (N)

  Distance ↔️ The length of movement, meters (m)