Work, Energy and Power Flashcards

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1
Q

What is “Work Done”

A

Work done is whenever a force moves an object. If it doesn’t move, then there is no work being done

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2
Q

What is the equation that includes work done, distance moved and force

A

Work done = force x distance moved

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3
Q

What are the units of Work

A

Joules (J)

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4
Q

What are the units of force

A

Newtons (N)

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5
Q

Energy is always…….; this means that “energy cannot be…….or………“but it can be turned from one form to…….

A

Conserved
Created
Destroyed
Another

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6
Q

Work done =

A

Energy transferred

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7
Q

When a force acts on an object at 90° to the direction it is moving, is any work being done

A

No

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8
Q

The size of the force needed to lift an object is equal to it’s……

A

Weight, measured in Newtons too

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9
Q

What is the equation that links weight, mass and gravity

A

Weight = mass x gravity

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10
Q

What is the gravitational field strength on Earth (GCSE)

A

10 N/Kg

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11
Q

What is power

A

The rate of work done or the rate of energy transfer

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12
Q

What is the equation that links power, time and work done

A

Work done = power x time

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13
Q

What are the units of power

A

Watts

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14
Q

What is the equation that links G.P.E, Mass, Gravity and height

A

G.P.E = mass x g x height

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15
Q

What are the units of G.P.E

A

Joules (J)

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16
Q

What are the units of g

A

m/s²

17
Q

A 25Kg box slid up a ramp 2m long to a height of 0.8m above the ground, how much potential energy does it gain

A

25 x 10 x 0.8

= 200J

18
Q

What is the equation that links kinetic energy, mass and speed

A

Kinetic energy = ½ mass x speed²

19
Q

What are the units of kinetic energy

A

Joules (J)

20
Q

……lost =…….gained

A

G.P.E
Kinetic energy
m x g x h = ½ x m x v²