Work & Power
Work
Work measures the effects of a force acting over a distance
- Work transfers energy
- Work is only done on an object if the object moves in the direction of the force applied
Equation: Work = Force x Distance
- Work is measured in a unit called Joules (J)
Work Practice Problem
A freshman pushes a box with a force of 50 N over a distance 0.9 meters. What is the amount of work performed? Work = Force x Distance
Practice Problems
- A freshman pushes a box with 50 N of force over a distance 0.9 meters. What is the amount of work performed?
Work = Force x Distance = 50 N x 0.9 m = 45 Joules
True or False?
True or False?
True or False?
How do we make work easier for people to do on Earth?
Simple machines!
How Do Simple Machines Make Work Easier?
- Simple machines help us do work by making it easier to move or lift things.
- They do this by:
- Changing the direction of a force
- Increasing the distance over which a force is applied
- Multiplying the force we apply (making it stronger)
- Reducing the amount of force we need to use
- Examples of simple machines:
- Lever
- Pulley
- Inclined Plane
- Wheel and Axle
- Screw
- Wedge
- These tools don’t reduce the total work, but they make it feel easier by spreading the effort out.
Power
Power is a measurement of the rate at which work is done
- Power indicates how fast the work is getting done
- Example: More power is required running up stairs vs walking.
- Equation: Power = Work / Time
- Power is measured in watts (W)
- 1 watt = 1 Joule per second (J/s)
Considering our Power Equation…(Power = Work / Time)
How do you increase power?
How can you increase Power?
(Power = Work / Time) How do you increase power?
- You can increase the amount of Work done
OR
- Decrease the amount of time the work is done
Power Practice Problems
- If 20 Joules of work is performed on an object in 120 seconds, what is the power of the object?
Power Practice Problem
- If 20 Joules of work is performed on an object in 120 seconds, what is the power of the object?
- Power = work / time
- = 20 J / 120 s
- = 0.17 watts
End of Presentation!
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Work & Power
Ivette Moser
Created on February 24, 2026
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Transcript
Work & Power
Work
Work measures the effects of a force acting over a distance
- Work transfers energy
- Work is only done on an object if the object moves in the direction of the force applied
Equation: Work = Force x DistanceWork Practice Problem
A freshman pushes a box with a force of 50 N over a distance 0.9 meters. What is the amount of work performed? Work = Force x Distance
Practice Problems
- A freshman pushes a box with 50 N of force over a distance 0.9 meters. What is the amount of work performed?
Work = Force x Distance = 50 N x 0.9 m = 45 JoulesTrue or False?
True or False?
True or False?
How do we make work easier for people to do on Earth?
Simple machines!
How Do Simple Machines Make Work Easier?
Power
Power is a measurement of the rate at which work is done
Considering our Power Equation…(Power = Work / Time)
How do you increase power?
How can you increase Power?
(Power = Work / Time) How do you increase power?
- You can increase the amount of Work done
ORPower Practice Problems
Power Practice Problem
End of Presentation!
Start Over