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Physics Yr 8 > Chapter 5: Exploring Contact and Non-Contact Forces > Flashcards

Chapter 5: Exploring Contact and Non-Contact Forces Flashcards

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1
Q

Everything that has mass has gravitational pull.

Is it True/False?

A

False

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2
Q

Gravity still works when there are objects in between

Is it True/False?

A

True

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3
Q

Gravity stops working when there are objects in between.

Is it True/False?

A

False

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4
Q

Gravity weakens with distance.

Is it True/False?

A

True

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5
Q

Gravity weakens with speed.

Is it True/False?

A

False

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6
Q

Mass and Gravity are the same thing. They both involve gravity.

Is it True/False?

A

False

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7
Q

There is a difference between mass and weight. Mass involves gravity.

Is it True/False?

A

True

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8
Q

When gravity is the only force, all objects have the same acceleration.

Is it True/False?

A

False

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9
Q

What is the “mass”?

A

The mass of an object is the amount of matter or “stuff” it contains. The more matter of an object contains, the greater its mass.

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10
Q

What is the “weight”?

A

The weight of an object is the gravitational force between the object and the Earth. The weight of an object depends upon its mass and the gravitational field strength.

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11
Q

What is the calculation that combines Mass, Weight and Gravitational Field Strength?

A

Weight (N) = Mass (kg) multiply Gravitational Field Strength (N/kg)

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12
Q

What is acceleration caused by?

A

Acceleration is due to gravity

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13
Q

When we drop something, what causes things to fall?

A

When we drop something, the thing that causes things to fall is gravity.

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14
Q

What affects everything in the same way?

A

Gravity affects everything in the same way.

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15
Q

What happens when gravity effects everything to fall in the same way?

A

Gravity affects everything in the same way - causing it to accelerate towards earth at the same speed.

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16
Q

When things fall more slowly, what are they being affected by?

A

When things fall more slowly, they are affected by air resistance.

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17
Q

What is “air resistance”?

A

Air resistance is a force which acts in the opposite direction to gravity.

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18
Q

What affects how slowly or quickly the object will fall?

A

The surface area affects how slowly or quickly and object falls.

Items with a larger surface area will fall more slowly.
Items with a smaller surface area will fall more quickly.

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19
Q

Why don’t camels sink in the sand?

A

Camels don’t sink in the sand because they spread the force along their feet. This scenario will result in lower pressure because it spreads the force to its whole feet. It’s helpful in this scenario as it will prevent the camels from sinking.

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20
Q

Why do rugby/football boots have spikes on them?

A

Rugby/football boots have spikes on them so that they can have a grip on the ground to prevent the footballers/rugby players from tripping. This scenario will result in higher pressure as there’s less surface area.

21
Q

What are narrow tyres better on a snow-covered road than wide tyres?

A

Narrow tyres are better on a snow-covered road than wide tyres because the smaller are has a higher pressure so it cuts through the snow and can grip the tarmac below.

22
Q

Why do tractors have wide tyres?

A

Tyres have very wide tyres because the weight is spread over a wider area and the pressure is reduced.

23
Q

Why is it easier to hammer a sharp nail into wood than a blunt one?

A

It is easier to hammer a sharp nail into wood than a blunt one because the pressure is greater through a sharp point than through a blunt one.

24
Q

Why would trying to walk across a frozen pond be even more dangerous than sliding across in a sitting position?

A

Trying to walk across a frozen pond would be even more dangerous than sliding across in a sitting position because when you sit your weight is spread through a wider area and the pressure is reduced.

25
Q

If the ice on a frozen pond was just holding your weight than when standing still, why would starting to walk cause you to fall through

A

If the ice on a frozen pond was just holding your weight than when standing still, starting to walk could cause you to fall through because when you lift one foot to step forwards all your weight is acting through one foot and so the pressure is doubled.

26
Q

What is the equation for pressure?

A

Pressure = N (force) divided by M squared (area)

The units are N/m2 or Pa ( 1N/m2 = 1Pa )

27
Q

What is up thrust?

A

Up thrust is the force which comes from the displaced water. It is equal to the weight of the water displaced.

28
Q

What is static electricity?

A

Static electricity is when an object gains or loses electric charge in the form of electrons.

Objects that lose electricity electrons become positively charged.
Objects that gain electrons become negatively charged.

29
Q

The three magnetic elements are iron, nickel and copper.

True/False

A

False

The three magnetic elements are nickel, iron and cobalt.

30
Q

The Earth’s core contains materials that are rich in iron.

True/False

A

True

31
Q

Lightning occurs when a small charge escapes quickly from clouds that have become charged during a storm.
True/False

A

False

Lightning occurs when a large charge escapes quickly from clouds that have become charged during a storm.

32
Q

The nucleus has a positive charge because it contains positively charged protons.
True/False

A

True

33
Q

An electrostatic field exists around a charged object that can exert a contact force.
True/False

A

False

An electrostatic field exists around a charged object that can exert a non-contact force

34
Q

Paint spraying can be improved by using spray guns that give a positive charge to the the paint.
True/False

A

True

35
Q

The stronger the gravity is, the greater the weight is of an object.
True/False

A

True

36
Q

When a person lies down, they can feel comfortable even on a hard surface.
True/False

A

True

37
Q

If the force of a weight is acting over a small surface area, the pressure is greater.
True/False

A

True

38
Q

Force is measured in Newtons.

True/False

A

True

39
Q

Pressure is a non-contact force.

True/False

A

True

40
Q

Pressure is measured in newtons.

True/False

A

False

Force is measured in Newtons.

41
Q

The formula for pressure is force divided by area.

True/False

A

True

42
Q

Pressure increases as the area increases.

True/False

A

False

Pressure decrease as the area increases.

43
Q

Magnetism is a contact force.

True/False

A

True

44
Q

North to North attracts, South to South attracts and North to South repels
True/False

A

False

North to North repels;
South to South repels;
North to South attracts.

45
Q

Static energy: When an object loses/gains electrons.

True/False

A

True

46
Q

Pressure increases in water when the depth increases.

True/False

A

True

47
Q

The higher you go in atmosphere the more pressure

True/False

A

False

The higher you go in atmosphere, the less pressure.

48
Q

The up thrust is less than the pressure, the object floats.

True/False

A

False

The weight is less than the pressure, the object floats.

Physics Yr 8 (3 decks)

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