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Energy
Science
Question | Answer |
---|---|
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. | energy |
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. |