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|How would you describe a force?
|A force is a push or pull of an object.
|When _______________ is used to apply force, objects can move.
|Tomas struggles to open a jar, but the lid does not budge. Is Tomas doing work? Explain.
|Because work requires that a force move something a certain distance, Tomas is not doing work.
|What two factors affect how much work is done in any given action?
|The two factors are force and distance.
|Hint: work = force x distance A grandfather lifts a baby 1.5 m with an upward force of 80N. How much work is being done?
|Work = fork x distance Work = 80N x 1.5m Work = 120 N-m or 120J.
|How do you calculate power?
|Power = work/time Since work equals force times distance Power = Force times distance divided by time
|What is the difference in power between a 60 watt lightbulb and a 100 watt lightbulb?
|The 60 watt lightbulb transfers less energy per unit of time.
|How are energy an motion related?
|It takes energy for motion to occur.
|Is work done when you hold a heavy object for a long time? Why or why not?
|It take force to hold an object, but no work is being done if the object does not move a distance.