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YR8 Physics > Forces, Motion and speed > Flashcards

Forces, Motion and speed Flashcards

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1
Q

What is a variable that is changed in an experiment?

A

An independant variable

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2
Q

What is the variable that is measured in an experiment?

A

A dependant variable

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3
Q

The rate at which speed changes over time?

A

Acceleration

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4
Q

What are the 5 things that forces can make objects do?

A
  • speed up
  • slow down
  • Change direction
  • change shape
  • turn
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5
Q

What is a force?

A
  • A force can be a push or pull movement
  • Forces can be contact or non-contact
  • Forces can be balanced or unbalanced
  • It can change objects in speed, shape and direction
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6
Q

What is the formula for speed?

A

Speed = Distance/Time

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7
Q

What are forces measured in?

A

Newtons

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8
Q

Name contact forces?

A
  • Upthrust
  • Friction
  • Air-Resistance
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9
Q

What are examples of non-contact forces?

A
  • Gravitational force
  • Magnetic field
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10
Q

Define Upthrust

A

The upward force

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11
Q

Define gravity

A

The force that attracts an object to the centre of the Earth

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12
Q

What is friction?

A

It is a force that slows objects down, and created when one object rubs against another

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13
Q

What is air-resistance?

A

The opposite force to movement, and it is created by particles.

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14
Q

Explain why air-resistance increases when you move faster

A

There will be more particles

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15
Q

Which force pulls you down when skydiving

A

Gravity

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16
Q

Which force slows you down while skydiving

A

Air-resistance

17
Q

Which force hits against the car when driving?

A

Air-resistance

18
Q

Which direction does gravitational force apply?

A

Downwards

19
Q

Suggest what would happen to the weight and mass of an astronaut on the moon

A

The weight would be different because when you are on the moon there is less gravity pulling you down, however the mass will stay the same as you will still contain the same amount of atoms in your body.

20
Q

Why do dolphins have a streamlined shape

A

So that it can move through the water with the least possible water-resistance

21
Q

What happens to the air-resistance when the parachute is opened?

A

Since the parachute has a big area there will be more particles hitting it so the air-resistance
will become greater, causing the person using it to slow down.

22
Q

Explain the difference between mass and weight

A

Weight is the force that pulls you down.
Mass is the amount of atoms in the body

23
Q

What is the force that keeps you afloat in water?

A

Upthrust

24
Q

When are forces balanced?

A

Forces are balanced when they are equal in size but are opposite in direction. The forces cancel each other out

YR8 Physics (1 decks)

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