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Physics > Motion > Flashcards

Motion Flashcards

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0
Q

Velocity

A

Rate of change of displacement

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1
Q

Displacement

A

Distance travelled in a particular direction

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2
Q

To calculate the velocity

A

Increase in displacement ➗time taken

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3
Q

a = (v-u)/t

A

Acceleration = change in velocity ➗ time taken

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4
Q

Speed definition

A

Rate of change of distance

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5
Q

The gradient of a velocity time graph is equal to

A

The acceleration

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6
Q

The area under a velocity time graph is equal to

A

the distance travelled by the object in a particular time interval

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7
Q

Shallow gradient on velocity time graph

A

Low acceleration

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8
Q

Steep gradient on velocity time graph

A

High acceleration

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9
Q

Horizontal (zero gradient) on velocity time graph

A

No acceleration

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10
Q

Negative gradient on velocity time graph

A

Negative acceleration (deceleration)

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11
Q

Straight line on distance time graph

A

Object moving at constant speed

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12
Q

Scalars

A

Have a magnitude (size) only

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13
Q

Examples of scalar quantities 4

A

Temperature
Time
Distance
Speed

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14
Q

Examples of vectors 3

A

Force
Displacement
Velocity

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15
Q

In a distance time graph the gradient is equal to

A

The velocity

16
Q

Why does the GPE decrease as the ball gets closer to the ground

A

Because the height above the ground is getting smaller

17
Q

Why is the GPE converted into kinetic energy

A

Conservation of energy - energy not created or destroyed, just transferred into different types

18
Q

Why does the ball accelerate towards the ground

A

Because it is gaining kinetic energy

19
Q

Energy changes when the ball is squashed

A

The kinetic energy is converted into elastic potential energy

20
Q

Energy changes that cause the squashed ball to move back into the air

A

Ball converts the elastic potential energy back into kinetic energy

21
Q

Energy at the peak of the bounce

A

All the kinetic energy has been converted into GPE

22
Q

Energy at the point where the ball is about to hit the ground

A

All the GPE has been converted into kinetic energy

23
Q

Why is the bounce not as high as the release height

A

Some of the energy has been transferred to the surroundings in the form of sound & thermal energy

24
Q

Once the ball has come to rest, what has happened to all the original GPE?

A

It has all been transferred to the surroundings

25
Q

Why is force a vector

A

The size of a force and the direction in which it acts are both important

26
Q

If the line is horizontal in a distance time graph

A

The object is stationary

27
Q

Newtons 2nd law of motion

A

Resultant force is directly proportional to acceleration

28
Q

Speed definition

A

The magnitude of velocity when the motion is in a straight line in one direction only

29
Q

If the line slopes down to the right (negative gradient) on a DISTANCE-time

A

The distance that the object is from the starting point is now decreasing - the object is now retracing it’s path back to the start

30
Q

If the line is horizontal on a distance time graph

A

The object is stationary

31
Q

Distance definition referencing displacement

A

The magnitude of displacement when the motion is in a straight line in one direction only

32
Q

Acceleration relation to mass observation & conclusion

A

1)On objects with the same mass, a smaller force will produce smaller acceleration than a larger force
2) acceleration is inversely proportional to mass
Eg doubling the mass will halve the acceleration

33
Q

Acceleration relation to force observation & conclusion

A

1) when the same force is applied to objects with a different mass, the smaller mass will experience a greater acceleration
2) force is proportional to acceleration
Eg doubling the force acting on an object doubles it’s acceleration

34
Q

Why is excessive deceleration unwanted example

A

If the brakes are applied too hard, the tyres will not grip the road surface & the car will skid

35
Q

If you are designing a car for high acceleration, what does the equation f=ma tell you?

A

The car should have a low mass

The engine should supply a high acceleration force

36
Q

Newton’s third law of motion

A

When two objects interact, the forces they exert on each other are equal and opposite

Physics (17 decks)

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