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A Level Physics > C3 (Motion) > Flashcards

C3 (Motion) Flashcards

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1
Q

Average speed equation

A

Total Distance travelled/ total time taken

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2
Q

What does the gradient in a distance time graph represent

A

Speed

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3
Q

Instantaneous speed

A

Is the speed of the car over a very short interval of time

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4
Q

How to find instantaneous speed

A

Draw a tangent at the point

The gradient is the instantaneous speed

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5
Q

Equation for average velocity

A

Change in displacement/ time taken

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6
Q

In a displacement time graph what does the gradient represent

A

Velocity

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7
Q

Acceleration definition

A

The rate of change of velocity

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8
Q

Acceleration definition

A

a= change v/ change t

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9
Q

What does the gradient of a velocity time graph represent

A

Acceleration

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10
Q

What does the gradient of a velocity time graph represent

A

Acceleration

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11
Q

How do u find the displacement of a velocity time graph

A

Area underneath the graph

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12
Q

Stopping distance

A

The total distance travelled between the moment when you first see a reason to stop, to when the vehicle CK es to a stop

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13
Q

Thinking distance

A

The distance travelled between the moment you first see a reason to stop, to the moment you apply the brakes

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14
Q

Braking distance

A

Distance travelled from the time the brake is applied until the vehicle stops

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15
Q

Many factors influence these distances

A 
Speed of vehicle
Condition of brakes
Tyres 
Road 
Weather conditions
Alertness of the driver
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16
Q

Equation of thinking distance

A

Speed x Reaction time

17
Q

Free fall definition

A

When an object is accelerating under gravity, with no other forces acting on it, it is said to be in free fall

18
Q

What does the value of g depend on

A

Altitude
Latitude
Geology of an area

19
Q

What are three different ways of measuring the value of g

A

Electromagnet and trap door
Light gates
Taking pictures

20
Q

Projectile motion, assuming that there is no air resistance, what can be stated?

A

The vertical velocity changes due to acceleration of free fall
The vertical displacement and time of flight can be calculated using the equations of motion
Horizontal velocity remains constant

21
Q

What are the two types of friction

A

Contact and fluid friction

22
Q

How does an increase in speed affect the value of friction

A

It also increases

23
Q

What can the force friction never do

A

Speed things up or start something moving

24
Q

What does friction convert kinetic energy into?

A

Heat

25
Q

What decreases terminal velocity

A

The SA of the falling object

26
Q

A moment

A

Is the turning effect of a force

27
Q

What does the moment or torque depend on

A

Force being applied

And it’s distance from the pivot

28
Q

Moments must be balanced or…

A

The objects will turn

Sum of clockwise moments = sum of anticlockwise moments

29
Q

Muscles, bones and joints all act as what?

A

Levers

30
Q

What is a couple

A

Pair of forces of equal size which act parallel to each other, but in opposite directions

31
Q

What does the torque depend on

A

The size of the forces and the distance between them

A Level Physics (28 decks)

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