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Y9 > Physics > Flashcards

Physics Flashcards

1
Q

Average Speed (formula)

A

total distance / total time

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2
Q

Speed

A

Speed= Distance/Time (V=S/T)

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3
Q

Distance

A

Distance=SpeedxTime (S=TxV)

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4
Q

Time taken

A

Time taken=Distance/Speed (T=S/V)

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5
Q

Scalar

A

A quantity with magnitude (size) only. Eg. Distance

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6
Q

Vector

A

A quantity with magnitude

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7
Q

Thinking Distance

A

The distance a vehicle travels in the time it takes for a driver to react to the situation and apply the breaks. Speed x Reaction Time (S=VxT)

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8
Q

What affects the thinking distance?

A

Mental Illness, Influences, Distractions, Tiredness, Medical Problems , Visibility Issues

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9
Q

Braking Distance

A

The distance that is travelled from the moment the breaks are applied until standstill.

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10
Q

What affects the braking distance?

A

Road Surface, Weight of the car, Traction of the tyres, Speed, Weather conditions, Tyre conditions

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11
Q

Stopping Distance

A

Thinking Distance + Braking Distance

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12
Q

Examples of Forces

A

Friction, Weight, Air resistance, Water resistance, Drag, Electrostatic, Upthrust, Tension, Reaction(Contact/Normal), Lift

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13
Q

The 2 types of friction

A

Static: Hard to get things to move. Dynamic: once it is moving

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14
Q

What affects friction?

A

Mass: Heaviness can increase friction. Surface: Coarser creates more friction. Contact Area: bigger=more smaller=less

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15
Q

Pivot

A

Helps something else move (eg. Hinges or Handle), tries to move in a circle

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16
Q

Moment

A

The turning force increases if the force is larger and decreases if distance from pivot increases. The force created in a circular motion off a specific point or axis

17
Q

Moment Formula

A

force x perpendicular distance moment= fxd

18
Q

Equilibrium in Turning forces

A

total acw moments must equal the total cw moments

19
Q

Law of Energy Conservation

A

Energy can be transferred but it is never created or destroyed just changes into another form.

20
Q

Efficiency Formula

A

useful energy output/ total energy output x 100%

21
Q

Work Done Formula

A

W= FxD

22
Q

What kind of energy is in petrol?

A

Chemical

23
Q

Kinetic energy

A

Found in moving objects, increases with the mass and speed of the object

24
Q

Gravitational Potential Energy

A

Stored in rock because of its position above the ground due to the pull of gravity, can be transferred

25
Q

Chemical energy

A

Found in chemical bonds, petrol, batteries and food are examples of stores

26
Q

Elastic energy

A

Found in elastic objects and they can be stretched or compressed, Elastic potential energy happens when you strain the object and when you let go the energy can be transferred. eg. Kinetic in a slingshot

27
Q

Magnetic energy

A

Found in magnetic materials, 2 magnets can attract or repel each other, due to the magnetic field created by some of the magnetised material.

28
Q

Electrostatic energy

A

Found in electrostatically charged objects, attracts tight objects. eg. Hair, Rubber, Polystyrene

29
Q

Nuclear Energy

A

Found when radioactive substances decay, nuclei are split.

30
Q

Thermal energy

A

Found in hot objects, hotter objects have more energy in its thermal energy store

31
Q

Energy mnemonic

A

KG CEMENT

32
Q

Energy Transfer mnemonic

A

HERM- 4 energy carriers that are also called pathways or transfers

33
Q

By heating (energy carrier)

A

Transmits energy in the form of thermal eg. Fossil Fuels

34
Q

Electrically (energy carrier)

A

Transmits energy in electricity but can be converted easily to different energy carriers (heating,mechanical) eg. Pressurised air or Sprints

35
Q

By radiation (energy carriers)

A

Transmits energy in electromagnetic waves. Radiation is the energy sent during something from the energy that the particle is carrying eg. Earth- heated by the sun

36
Q

Mechanically (energy carrier)

A

Transmits energy in potential and kinetic energy turn is it into power eg. Steam+Wind

37
Q

Work Done

A

Whenever a resultant force moves a body in the direction of the force (mechanically). Generally overcomes an opposing force (eg. Friction).

38
Q

Power Formula

A

Work Done/ Time

39
Q

Force Formula

A

mass x g

Y9 (11 decks)

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