Speed Flashcards

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1
Q

What is speed measured in

A

Metres per second

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2
Q

How do you calculate speed

A

Speed = Distance ÷ Time

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3
Q

What is meant by the average speed

A

Total distance ÷ Total time

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4
Q

What is meant by instantaneous speed

A

Speed at a certain time

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5
Q

What is relative motion

A

The difference between the speeds of two moving objects, or of a moving and stationary object

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6
Q

What does a distance time graph look like

A

Distance on the Y axis
Time on the X axis

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7
Q

What does a curved line show on a
distance-time graph

A

Speed is changing / Accelerating

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8
Q

What is gas pressure

A

The force exerted by gas particles when they collide with a surface

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9
Q

State 2 ways you can increase gas pressure

A

Increase the temperature
Decrease the volume

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10
Q

What does it mean for a gas to be compressed

A

Squashing the particles into a smaller place

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11
Q

What is atmospheric pressure

A

Pressure caused by the collision of air molecules that produce a force on an area

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12
Q

What happens to the atmospheric
pressure if you go higher up? Why?

A

It decreases because gravity pulls the particles down

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13
Q

What happens to the atmospheric
pressure if you go to sea level? Why

A

It increase as there are more particles as gravity pulls them down

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14
Q

Explain why a lower atmospheric pressure higher up can be bad for people

A

Less oxygen so climbers cannot breathe

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15
Q

What is liquid pressure

A

The pressure produced by collisions of particles in a liquid

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16
Q

Can you compress a liquid

A

No they are uncompressable

17
Q

Why are dams thicker at the bottom than at the top

A

Liquid pressure is lower down as there is more water above it pushing down

18
Q

What happens to the amount of liquid pressure if you go deeper into the liquid

A

It increases

19
Q

Why do some objects float

A

The upthrust is greater than the weight

20
Q

Why do some objects sink

A

The weight is bigger than the upthrust