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Physics - AQA > Topic 5 - Forces (paper 2) > Flashcards

Topic 5 - Forces (paper 2) Flashcards

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1
Q

What is a moment?

A

rotational or turning effect of a force

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2
Q

What is the formula for a “moment”?

A

M = Fd

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3
Q

What is the unit for a “moment”

A

Newton metres (Nm)

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4
Q

What is the “d” in the equation for “moments”

A

perpendicular distance

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5
Q

In a balanced seesaw the total clockwise moment is …….. to the total anti- clockwise moment. Fill in the gap.

A

Equal to

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6
Q

How do levers work?

A

They work by transmitting the turning effect of a force

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7
Q

What is the formula for weight?

A

Weight = mass x gravitational field strength
W = mg

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8
Q

When two gears are connected, do the gears turn in opposite directions, or the same directions?

A

Opposite directions

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9
Q

What is the relationship between the ratio of the turning effect of the two gears to the ratio of the radius of the two gears

A

They are proportional

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9
Q

True or False? All states exert pressure.

A

True

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10
Q

What states does the term “fluid” refer to?

A

Liquid or Gas

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11
Q

What is the formula for pressure?

A

Pressure = force/ area
P = F/A

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12
Q

What’s the unit for pressure?

A

Pascals (Pa)

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13
Q

What are the factors which determined the pressure exerted by a liquid?

A

The depth, density of liquid, gravitational field strength

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14
Q

What is the formula for pressure in a liquid?

A

p = hpg

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15
Q

What’s the units of pressure in a liquid?

A

Pascals (Pa)

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16
Q

What It is upthrust caused by?

A

The pressure on the bottom of the object being greater than the pressure on the top of the object

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17
Q

What will happen to an object if it is more dense than the liquid its in?

A

It will sink

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18
Q

Is atmospheric pressure higher or lower at a higher elevation?

A

Lower

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19
Q

What does atmospheric pressure refer to

A

the total force of all the air particles constantly colliding with everything, from all sides

20
Q

Why is there a greater atmospheric pressure at sea level than at a higher elevation?

A

There are more gas particles at sea level to collide with objects and the air is more dense at sea level

21
Q

What are the two main gases which make up the atmosphere?

A

Nitrogen and Oxygen

22
Q

What is a scalar quantity?

A

Only has magnitude

23
Q

What is a vector quantity?

A

Has both direction and magnitude

24
Q

Is speed a scalar or vector quantity?

A

Scalar quantity

25
Q

Is velocity a scalar or vector quantity?

A

Vector quantity

26
Q

Is distance a scalar or vector quantity?

A

Vector quantity

27
Q

Is displacement a scalar or vector quantity?

A

Scalar quantity

28
Q

What is the formula for velocity?

A

velocity = speed/ time
v = s/t

29
Q

What is acceleration?

A

The rate of change of velocity

30
Q

What is the formula for acceleration?

A

acceleration = change in velocity/ time

31
Q

What is another formula for acceleration?

A

v^2 - u^2 = 2as
final velocity^2 - initial velocity^2 = 2 x acceleration x distance

32
Q

On a distance/ time graph what axis is distance on?

A

y-axis

33
Q

On a distance/ time graph what axis is time on?

A

x-axis

34
Q

What does the gradient of a distance/time graph tell us?

A

the speed of the object

35
Q

What does a flat line on a distance/time graph tell us?

A

The object is stationary

36
Q

How to find the velocity at a point on a distance/time graph?

A

Draw a tangent at the point and use it to find the gradient of the line

37
Q

On a velocityy/ time graph what axis is velocity on?

A

y-axis

38
Q

On a velocity/ time graph what axis is time on?

A

x-axis

39
Q

What does a flat line on a velocity/time graph tell us?

A

The object is moving at a constant velocity

40
Q

What does the gradient of a velocity/time graph tell us?

A

The acceleration or deceleration of the object?

41
Q

How can you tell the distance traveled on a velocity/time graph?

A

The area under the curve

42
Q

What is the force that causes an object to fall towards the earth?

A

Weight

43
Q

What is the size of the air resistance dependent on?

A

surface area and velocity

44
Q

As the velocity of a falling object increases, the air resistance……. Fill in the gap.

A

Increases

45
Q

What is “terminal velocity”

A

When an object is falling with a constant velocity

46
Q

When is terminal velocity reached?

A

The resultant force is zero and the weight has the same magnitude as the air resistance

47
Q
A

Physics - AQA (5 decks)

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