P5: Forces and Energy Flashcards

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1
Q

Work

A

Energy transferred by a force.

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2
Q

Work(J) =

A

Force (N) x Distance moved in the direction of force (m)

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3
Q

What is needed for work to be done?

A

Energy

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4
Q

What is work done to overcome friction transferred as?

A

Energy that heats the objects that rub together and energy that heats the surroundings.

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5
Q

Power

A

The rate at which energy is transferred per second.

Watt

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6
Q

Power (W) =

A

Useful energy transferred (J) / Time taken

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7
Q

Gravitational Potential Energy

A

Energy of an object due to its position in a gravitational field.

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8
Q

When an object is moved up…

A

… Its GPE increases

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9
Q

GPE is equal to…

A

… The weight of an object

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10
Q

Change in GPE (J) =

A

Weight (N) x Change of height (m)
OR
Mass (kg) x GFS (N/kg) x Change in height (m)

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11
Q

Kinetic Energy (J) =

A

1/2 x mass (kg) x speed(2) (m/s(2))

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12
Q

Elastic Potential Energy

A

The energy stored in an elastic object when work is done on it.

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13
Q

What does the kinetic energy of an object depend on?

A

mass and speed

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14
Q

Kinetic Energy

A

The energy of a moving object due to its motion.

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