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A-level AQA Physics > 04 Work And Energy > Flashcards

04 Work And Energy Flashcards

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1
Q

When is mechanical work done?

A

When a force moves an object.

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2
Q

When someone kicks a ball, is the work done positive or negative?

A

Positive

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3
Q

When someone catches a ball, is the work negative or positive?

A

Negative

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4
Q

What is the S.I unit for work done?

A

Joules (J)

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5
Q

Is energy a vector or scalar quantity?

A

Scalar

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6
Q

When calculating work done what is the force equal to?

A

The weight of the object

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7
Q

What is the effect a force has in a particular direction called?

A

The component

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8
Q

What is required to calculate a component?

A

A component triangle

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9
Q

What is a component triangle?

A

A right angle triangle in which the force forms the hypotenuse.

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10
Q

What is work measured in?

A

Joules (J)

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11
Q

What are the 3 categories of energy?

A

-electromagnetic energy
-kinetic energy
-potential energy

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12
Q

What is potential energy?

A

Energy stored within a system as a result of position or condition

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13
Q

What is kinetic energy?

A

Energy of motion

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14
Q

What does the principle of the conservation of energy state?

A

Energy cannot be created or destroyed. It can only be changed from one form to another.

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15
Q

What is power?

A

The work done per unit time.

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16
Q

What is the unit for power?

A

Watts (W)

17
Q

What error are set squares used to eliminate?

A

Parralax error

18
Q

What is the work energy principle ?

A

The change of energy of an object is equal to the net work done on the object.

19
Q

When calculating work done what can you substitute weight into?

A

Force (F)

20
Q

What is efficiency?

A

Useful power output.

21
Q

What is the force of an engine (thrust) equal to?

A

The sum of all the resistive forces (friction and air resistance)

22
Q

In a force distance graph, what is the area under the line equal to?

A

Work done

23
Q

What is thinking distance?

A

The distance a vehicle will travel from the time that the driver thinks about pressing the break to when the break is actually pressed.

24
Q

What is breaking distance?

A

The distance a vehicle will travel from the point where it’s brakes are fully applied to when it comes to a complete stop.

25
Q

What is stopping distance?

A

The total distance travelled when stopping a vehicle.

26
Q

What is the equation for stopping distance?

A

Thinking distance + braking distance

27
Q

What is force x distance?

A

Work done

28
Q

Is work a vector or scalar quantity?

A

Scalar

29
Q

What is the definition of work?

A

Force applied multiplied by the displacement in the direction of the force

A-level AQA Physics (8 decks)

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