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Physics > Section 1 - Motion, Forces and Conservation of energy > Flashcards

Section 1 - Motion, Forces and Conservation of energy Flashcards

1
Q

What properties do vectors have?

A

Magnitude and direction

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2
Q

What is magnitude?

A

Size

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3
Q

What are some examples of vector quantities?

A

Force, velocity, displacement, weight, acceleration, momentum.

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4
Q

What properties do scalars have?

A

Magnitude ( no direction )

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5
Q

What are some examples of scalar quantities?

A

Speed, Distance, Mass, Energy, Temperature, time.

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6
Q

What is distance?

A

how far an object has moved
( scalar )

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7
Q

What is displacement?

A

The distance and direction in a straght line from an objects starting and finishing point.
( Vector )

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8
Q

What is speed?

A

How fast you are going
( scalar )

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9
Q

What is Velocity?

A

How fast you are going in a given direction.
( Vector )

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10
Q

What is a acceleration?

A

The change in velocity in a certain amount of time

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11
Q

What is deceleration?

A

negative acceleration

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12
Q

What is the uniform acceleration due to gravity?

A

10 m/s2

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13
Q

what is the typical speed for walking?

A

1.4 m/s

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14
Q

what is the typical speed for running?

A

3 m/s

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15
Q

what is the typical speed for cycling

A

5.5 m/s

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16
Q

what is the typical speed for cars in a built up area?

A

13 m/s

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17
Q

what is the typical speed for aeroplanes?

A

250 m/s

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18
Q

what is the typical speed for cars on a motorway?

A

31 m/s

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19
Q

what is the typical speed for Trains?

A

55 m/s

20
Q

what is the typical speed for wind?

A

5 - 20 m/s

21
Q

what is the typical speed for sound in air

A

340 m/s

22
Q

what is the typical speed for ferries?

A

15 m/s

23
Q

Why is acceleration a vector?

A

it is measuring a change in another vector

24
Q

What is the equation of average speed?

A

total distance/time for whole journey

25
Q

How do you work out the gradient of a line on a
graph?

A

vertical difference/horizontal difference

26
Q

( resultant forces )

What is Newtons first law?

A

a moving object will continue to move at the same speed and direction unless an external force acts upon it / A stationary object will remain at rest unless an external force acts on it

A resultant force is needed to change motion

27
Q

What is a resultant force?

A

When there is an overall force on an object

28
Q

What is balanced forces?

A

When there is no reslultant force
Forces acting on THE SAME object

29
Q

What does newtons first law mean?

A

A force is needed to change motion

30
Q

What is newtons 2nd law?

A

a resultant force ensues an object to accelerate

31
Q

What is the equation regarding force, mass and acceleration?

A

f = ma

32
Q

What is newtons 2nd law mean?

A

Acceleration is proportionate to the resultant force and the mass of the object

33
Q

What is newtons 3rd law?

A

when 2 objects interact, there is always a pair of forces present, known as action-reaction forces

34
Q

What are action reaction forces

A

forces fo the same size, type and in opposite
One object acting on another

35
Q

What are some energy stores?

A

Kinetic
Thermal
Chemical
Grav Potential
Elastic Potential
Electrostatic
Magnetic
Nuclear

36
Q

What are kinetic stores?

A

Anything moving has energy in its kinetic store

37
Q

What are Thermal stores?

A

any object - the hotter it is, the more energy it has in this store

38
Q

What is a chemical store?

A

anything that can release energy by a chemical reaction e.g. food, fuels

39
Q

what are Grav potential stores?

A

anything in a Grav field

40
Q

What is elastic potential?

A

anything streched , like springs, rubber bands

41
Q

What is electrostatic or magnetic stores?

A

Two charges that attract or repel each other

42
Q

What are neuclear stores

A

atomic nuclei release energy from this store in nuclear reactions

43
Q

When can energy be useful?

A

when it is transferred to a usefull store

44
Q

what reduces rate of energy transfer by heating?

A

Insulation e.g. walls with air gaps

45
Q

Energy Transfers

A

pathways for transferring energy

46
Q
A

Physics (7 decks)

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