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Y7&8 Science > Forces > Flashcards

Forces Flashcards

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1
Q

What is a force?

A

A push or a pull

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2
Q

What do we measure force in?

A

newtons (N)

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3
Q

What is the unit of mass?

A

kilograms (kg)

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4
Q

What is mass?

A

The amount of matter (stuff) a thing is made up of

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5
Q

What is weight?

A

The effect gravity is having on an object

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6
Q

What is friction?

A

The force that resists movement because of contact between surfaces

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7
Q

Upthrust?

A

A force pushing upwards on an object in a liquid

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8
Q

Lift?

A

A force pushing upwards on an object flying in the air

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9
Q

Air resistance/drag?

A

A force acting against any object that is moving through the Earth’s atmosphere

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10
Q

Thrust?

A

A push caused by an engine

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11
Q

When opposing forces are balanced, they…

A

either move at a constant speed or stay stationary

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12
Q

How do you work out the weight of something?

A

mass x gravity

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13
Q

In which situations are friction useful?

A

On ice when you don’t want to slip, around corners, to effectively keep you standing…

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14
Q

In which situations are friction not useful?

A

Friction burn, ice skating (in some cases)…

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15
Q

What is speed measured in/how do you calculate speed?

A

distance/time (For example miles/hour)

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16
Q

What is speed?

A

How fast or slow something is

17
Q

how do you calculate density?

A

mass/volume

18
Q

What is the effect of unbalanced forces on an object?

A

The object will travel towards whichever force that is the strongest

19
Q

What is water resistance?

A

The force on an object moving through water that cause it to slow down

20
Q

Streamlined?

A

Shaped to reduce resistance to motion from air or water

21
Q

Resistive forces?

A

Any force that acts to slow down a moving object

22
Q

What causes friction?

A

When surfaces make contact that slows down the movement of the object

23
Q

What reduces friction?

A

Reducing the contact, Making the surface more smooth, reducing the forces acting on the objects

24
Q

What is lubrication?

A

A substance that reduces friction

25
Q

How do you calculate distance?

A

Speed x time

26
Q

How do you calculate time?

A

Distance/speed

27
Q

What are the characteristics of a streamlined shape?

A

Rounded front, slowly tapering tail, smooth shape with no projections

28
Q

What affects the speed?

A

The mass of the object, the weight, how streamlined it is

29
Q

How do you calculate mass?

A

Weight/gravity

30
Q

How on this holy Earth does one calculate gravity?

A

Weight/mass

Y7&8 Science (3 decks)

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