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Physics P2 > P2.1 > Flashcards

P2.1 Flashcards

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1
Q

What’s a force?

A

A push or pull with direction and a vector

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2
Q

What are balanced forces?

A

When forces acting on something cancel each other out

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3
Q

What are unbalanced forces?

A

When the forces acting on something don’t cancel each other out, so it moves away from the greater force

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4
Q

What is an example of balanced forces?

A

When a person sits on a chair

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5
Q

What is an example of unbalanced forces?

A

When a person jumps out of a plane and falls towards the ground

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6
Q

What is Newton’s Third Law?

A

Every action has an equal and opposite reaction

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7
Q

What is resultant force?

A

When two or more forces act on an object at once

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8
Q

What 3 things do resultant forces do?

A

Change speed of an object
Change the direction of an object
Change the shape of an object

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9
Q

What is speed?

A

The rate of change of direction

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10
Q

What is velocity?

A

Speed with direction

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11
Q

What is acceleration?

A

The rate of change of velocity

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12
Q

What does velocity have?

A

Speed

Direction

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13
Q

How do you find the distance in a distance/time graph

A

Area under the graph

   Cut shape into triangles + rectangles
   1/2 b*h for triangles
         b*h for rectangle
     \+ together
     = total distance travelled
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14
Q

What is air resistance caused by?

A

Moving objects pushing air particles out of the way

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15
Q

What is stopping distance?

A

The time that it takes from a driver to see a stop sign, to when the car has stopped

(thinking distance+braking distance)

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16
Q

What is thinking distance?

A

The distance that it takes for a driver to react to a stimulus

17
Q

What factors affect thinking distance?

A 
Increase:
Alcohol
Fatigue
Badly lit roads
Distractions (e.g music)

Decreases:
Stimulants

18
Q

What factors affect braking distance?

A

Increases:
Icy roads
Worn tires
Amount of people in the car

Decreases:
New roads

19
Q

What’s braking distance?

A

The distance travelled by the car when the brakes are on

20
Q

What type of force do brakes provide for a car?

A

Backwards

21
Q

What’s terminal velocity?

A

When something is falling at a constant speed

22
Q

What is Hooke’s Law?

A

The force put on a spring is directly proportional to the extension

23
Q

What is mass?

A

A measure of the amount of matter that makes up an object

The same regardless of where you are

24
Q

What is weight?

A

A measure of the force acting on your mass caused by a gravitational field

(Changes depending on the gravitational field you’re in)

25
Q

Where does Hooke’s Law no longer apply?

A

Limit of proportionality/ elastic limit of a spring

26
Q

What is work done?

A

The amount of energy used

27
Q

What units measure work?

A

Joules

28
Q

How does friction affect work done?

A

Increases it

29
Q

What is power?

A

The rate at which work is done

30
Q

What’s the mnemonic for the different types of energy?

A

Most Kids Hate Learning GCSE Energy Names

31
Q

What are the different types of energy?

A 
Magnetic
Kinetic
Heat
Light
Gravitational Potential 
Chemical
Sound
Electrical
Elastic Potential
Nuclear
32
Q

What is gravitational potential energy?

A

The energy stored in an object in a gravitational field

33
Q

What is kinetic energy?

A

The energy that a moving object has

34
Q

What is momentum?

A

The quantity of motion of a moving object

mass*velocity

35
Q

What is momentum measured in?

A

Kg m/s

36
Q

What is the law of conservation of momentum?

A

If two objects collide, their total momentum after the collision is equal to their total momentum before the collision

Physics P2 (2 decks)

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