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Physics > 1 Forces and motion > Flashcards

1 Forces and motion Flashcards

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1
Q

What is the average speed formula?

A

speed = distance / time

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2
Q

What units is distance measured in?

A

Metres

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3
Q

What units is time measured in?

A

Seconds

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4
Q

What units is speed measured in?

A

M/s

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5
Q

What does displacement mean?

A

Distance in a specific direction

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6
Q

What is a vector quantity?

A

Speed in a particular direction

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7
Q

What are three examples of vector quantities?

A

Displacement, velocity, force

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8
Q

What a scalar quantity?

A

A quantity that has no size or direction

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9
Q

What are three examples of scalar quantities?

A

Mass, temperature, speed

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10
Q

What is the acceleration formula?

A

final velocity - initial / time

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11
Q

What are the units for velocity?

A

M/s

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12
Q

What are the units for acceleration?

A

M/s^2

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13
Q

How did Galileo measure acceleration?

A

By rolling a ball down a slope with 5 bells at different points, and seeing how long it took for them to reach the other bells, seeing how much they accelerate

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14
Q

What does uniform acceleration mean?

A

That something accelerates in equal intervals of time

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15
Q

How do you find acceleration in a velocity-time graph?

A

Increase of velocity / time taken

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16
Q

What is the average velocity formula?

A

initial + final / 2

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17
Q

How can you find the distance travelled in a velocity-time graph?

A

By calculating the distance of the shape under the graph

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18
Q

What units are used to measure force?

A

Newtons (N)

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19
Q

What is air resistance?

A

Something that tries to oppose the movement of objects through the air

20
Q

How do fast-moving animals stop a lot of air resistance?

A

By having a streamlined shape

21
Q

What is the unbalanced force?

A

Two forces acting on an object subtracted from each other (eg. push by the man - friction)

22
Q

How could there be no unbalanced force?

A

If the two forces on each side are equal

23
Q

What happens when there is no unbalanced force?

A

The object does not change the way it is moving

24
Q

What is friction?

A

The force that causes moving objects to slow down and finally stop

25
Q

Can forces change the shape of an object?

A

Yes

26
Q

What is an example of temporary change of shape?

A

Elastic bands; elastic materials do not break easily and return to their original shape when the force is removed

27
Q

What was Hooke’s law?

A

The extension of a spring is directly proportional to the force exerted

28
Q

How can Hooke’s law not apply to a spring?

A

If it is not stretched too far

29
Q

Do elastic bands obey Hooke’s law?

A

No

30
Q

What is the formula for force?

A

Force = mass x acceleration

31
Q

What units is forced measured in?

A

Newtons (N)

32
Q

What units is mass measured in?

A

Kg

33
Q

What units is acceleration measured in?

A

M/s^2

34
Q

What is a negative acceleration?

A

Deceleration

35
Q

How do brakes on bicycles and cars work?

A

Increasing the friction between the rotating wheels and the body of the vehicle

36
Q

What is the thinking distance?

A

The distance a vehicle travels during the time it takes for the driver to realise they need to break

37
Q

What factors can affect the thinking distance?

A

Tired, under the influence of drugs or alcohol, poor visibility

38
Q

What is the braking distance?

A

The distance that an object travels from the time when the brakes are applied to the time when it comes to a complete stop

39
Q

What is the weight of an object?

A

The force that acts on it because of gravity

40
Q

What is the formula for weight?

A

Weight = mass x gravitational field strength

41
Q

What is gravitational field strength measured in?

A

N/kg

42
Q

What is a drag force?

A

The force that opposes an objects movement

43
Q

What is a drag coefficient?

A

A measure of how easily an object moves through the air

44
Q

What is terminal velocity?

A

When the weight and drag force acting on an object are equal

45
Q

What happens when an object reaches terminal velocity?

A

It will not get any faster or slower

46
Q
A

Physics (5 decks)

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