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Physics P2 > Motion And Forces > Flashcards

Motion And Forces Flashcards

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1
Q

What is speed

A

How fast your going in any direction

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2
Q

What is velocity

A

Speed with a direction

The distance in a particular direction is called displacement

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3
Q

Speed=

A

Distance / time

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4
Q

What is a vector

A

A value with a size and a direction

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5
Q

What is acceleration

A

How quickly the velocity is changing

This can be a change is speed or change in direction

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6
Q

Acceleration =

A

Change in velocity / time taken

(V-U) / T

Acceleration is measured in m/s squared

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7
Q

What happens in a distance time graph

A

The gradient = the speed
Flat sections show a stop
The steeper the graph the faster it goes
Downhill sections mean it’s travelling back to the starting point
Curves represent acceleration or deceleration
A steepening curve means acceleration
A levelling off curve means deceleration

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8
Q

How to work out gradient

A

Value going up (vertical)/ value going across (horizontal)

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9
Q

What happens on a velocity time graph

A

Gradient = acceleration
Flat sections show a stead speed
The steeper the graph the more acceleration
Downhill sections show deceleration
The area under any part of the graph is equal to the distance traveled in that time
A curve means a changing acceleration

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10
Q

What do different force arrows show

A

The length of the arrow shows the size of the force
The direction of the arrow shows the direction of the force
If a pair of arrows are the same size then the forces are balanced

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11
Q

What forces are acting on a stationary object

A

Gravity acts downwards
This causes a reaction force of the surface pushing the object back up which is balanced to the object
There must be equal sideways forces so that the object doesn’t move sideways

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12
Q

What forces act on an object at a steady horizontal velocity

A

The weight and reaction force are balanced so it doesn’t float up
The thrust forward and the drag backwards are equal to maintain the same velocity

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13
Q

What forces are acting on a skydiver at a steady speed

A

The drag pulling upwards and the weight pulling down are both balanced

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14
Q

What forces cause horizontal acceleration

A

There must be an unbalanced force

The thrust forwards must be greater than the drag backwards the up and down forces are still balanced

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15
Q

What forces cause vertical acceleration

A

When there’s less drag the weigh pulls the object down so it accelerates

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16
Q

What is weight

A

It is measured in newtons and caused by the pull of Gravity it is a force

17
Q

What is mass

A

Not a force it’s the amount of stuff in an object any object will have the same given mass anywhere in the universe

18
Q

Weight =

A

Mass x gravitational field strength

19
Q

What is a vacuum

A

A place that contains no matter

20
Q

How does vacuum effect acceleration

A

Falling objects in a vacuum accelerate at the same rate no matter what their mass is

21
Q

What is terminal velocity

A

On earth when falling objects first set off they have much more weight pulling them down than air resistance slowing them down
As speed increases as does the air resistance
This gradually reduces the acceleration until eventually the weight and air resistance are balanced
The object won’t accelerate anymore once it’s reached terminal velocity

22
Q

What happens when two objects interact

A

If object a exerts a force on object b then object b exerts the exact opposite force on object a
This means if you push something it will push back against you then when you stop pushing it also stops

23
Q

What happens when there is no resultant force

A

The body will remain at rest or if it’s moving it will carry on at the same velocity

There is no resultant force when the forces are balanced

24
Q

What happens if the re is a resultant force acting on a body

A

It will accelerate in the direction of the resultant force

An unbalanced force always produces acceleration

25
Q

What are the five types of acceleration

A 
Starting 
Stopping 
Speeding up 
Slowing down 
Changing direction
26
Q

Force =

A

Mass X acceleration

Physics P2 (5 decks)

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