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A-level AQA Physics > 02 motion > Flashcards

02 motion Flashcards

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1
Q

What is the definition of rate?

A

Per unit time

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2
Q

What is the definition of speed?

A

Distance travelled per unit time

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3
Q

What is speed measured in?

A

m s‐¹

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4
Q

Is speed a vector or scalar quantity?

A

Scalar

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5
Q

What is the definition of a scalar quantity?

A

Magnitude but not direction

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6
Q

What is a definition of a vector quantity?

A

Magnitude and direction

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7
Q

What is the definition of displacement?

A

The distance moved in a straight line from a starting point

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8
Q

In displacement, if the starting point is the same as the finishing point, what is the final displacement?

A

0m

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9
Q

What is the definition of velocity?

A

The change in displacement per unit time

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10
Q

What is the S.I. unit for velocity?

A

m s‐¹

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11
Q

Is displacement a vector or scalar quantity?

A

Vector

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12
Q

What is the method for using a ticker timer to monitor the motion of a falling object?

A
  1. Sellotape about 1.00 m of the paper tape to an 100 g mass.
  2. Position the apparatus close to the edge of the bench so that as the 100 g mass falls it pulls the tape through the ticker timer.
  3. Hold the tape tight, start the ticker timer and then release.
  4. Dots are produced at 0.02 s intervals, so 1 ‘gap’ is between 2 dots.
  5. Draw vertical lines every 2 dots and measure the length for the first 10 tape pieces, starting the the end that was nearest to the mass and record the results in the table.
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13
Q

In a results table how do you write a unit?

A

Title /unit

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14
Q

What is the precision of a ruler?

A

±1mm as it is measured in mm

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15
Q

What is the definition of precision?

A

The smallest non-zero reading that can be measured.

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16
Q

What happens to the velocity as the mass falls on the ticker time practical?

A

It’s accelerating. The velocity increases.

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17
Q

What are any sources of error in the time ticker experiment?

A

Air resistance, friction between tape and plastic loops.

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18
Q

How do you calculate the range?

A

Largest number — smallest number

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19
Q

How do you calculate the uncertainty?

A

Range/2

20
Q

What is the smallest possible range? (Even if the range should =0)

A

0.01 (in a 2 d.p question) IT CANNOT EQUAL ZERO!

21
Q

What is the smallest uncertainty? (Even if it should equal 0)

A

0.01 (in a 2 d.p question) IT CANNOT EQUAL ZERO!

22
Q

How do you find the percentage uncertainty?

A

((Uncertainty) / (average value)) x100

23
Q

How can the final (eg) speed be found from the average (eg) speed?

A

Double the average (eg)speed.

24
Q

What are some sources of error when measuring the speed of a trolley using a light gate?

A

Air resistance, friction in between the wheels and the ramp, angle the trolley moves, the trolley is accelerating so the calculated wont be accurate.

25
Q

What do you do if your uncertainty or range is to more d.p than in the question/the measurement?

A

Make it 0.01 (in at 2d.p question)

26
Q

What is acceleration?

A

The rate of change in velocity.

27
Q

What is acceleration measured in?

A

m s‐ ²

28
Q

Is acceleration a vector or scalar quantity?

A

Vector

29
Q

What is the formula for acceleration?

A

a= v/t

30
Q

When does uniform acceleration occur?

A

When the velocity changes by the same amount each second.

31
Q

When does non-uniform acceleration occur?

A

When the velocity change each second varies.

32
Q

In velocity time graphs, what is the gradient of the line equal to?

A

The acceleration

33
Q

In velocity time graphs, what is the area under the line equal to?

A

Change in displacement.

34
Q

What is the equation for displacement?

A

Velocity x time

35
Q

What are ‘suvat’ equations?

A

Equations of motion

36
Q

What can ‘suvat’ equations be used to calculate?

A

S=displacement
U=initial velocity
V=final velocity
A=acceleration
T=time taken

37
Q

What is freefall?

A

When there is gravity acting on an object and nothing else.

38
Q

What is the definition of freefall?

A

The motion of an object undergoing an acceleration of ‘g’.

39
Q

In which direction does ‘g’ act?

A

Vertically downwards

40
Q

What is the magnitude of ‘g’?

A

Usually 9.81 m s‐², though it varies slightly at different points on the earth’s surface.

41
Q

What force acts on an object in freefall?

A

Weight

42
Q

In which situation can objects with an initial velocity in any direction and undergo freefall?

A

As long as the force providing the initial velocity is no longer acting.

43
Q

What happens when there is an absolute systematic error?

A

Non-zero y-intercept.

44
Q

Why and how can you use ‘suvat’ equations to find ‘g’ during freefall?

A

You substitute ‘g’ for ‘a’ (acceleration) as ‘g’ is a constant acceleration.

45
Q

Describe the motion of this graph

A

The object is stationary with a positive displacement.

46
Q

Describe the motion of this object

A

The object is moving at a constant positive velocity away from the origin.

47
Q

Describe the motion of this object

A

The object is accelerating with a positive acceleration away from the origin.

A-level AQA Physics (6 decks)

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