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physics: mass density weight > Physics: Mass Density Weight > Flashcards

Physics: Mass Density Weight Flashcards

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1
Q

Explain what is MASS

A

Mass is the amount of matter in an object.

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2
Q

What is the measure of Mass?

A

Mass is measured in kilograms (kg).

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3
Q

Explain what is Weight?

A

Weight is a force due to the pull of gravity on an object

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4
Q

What is the measure of Weight?

A

Weight is a force and so is measured in newtons (N).

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5
Q

Explain what is Density

A

Density describes how closely packed the particles are in a solid, liquid or gas.

Density is the amount of mass per unit volume.

Density is a measure of the mass in a given volume of a substance. It can be calculated using a equation:

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6
Q

How is Density calculated?

A

Density is a measure of the mass in a given volume of a substance. It can be calculated using the equation:

Density = Mass / Volume

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7
Q

What is the measure of Density?

A

Density is measured in kilograms per metre cubed (kg/m³)

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8
Q

What is the measure of Volume?

A

Volume is measured in metres cubed (m³)

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9
Q

Explan what is Volume

A

The volume of a three-dimensional shape is a measure of the amount of space or capacity it occupies, eg an average can of fizzy drink has a volume of 330 ml.

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10
Q

What is the formula for calculating weight?

A

The following equation can be used to calculate the weight of an object:

Weight = mass (kg) x gravitational field strength (N/kg)

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11
Q

Explain what is gravitational field strength here on Earth

A

Gravitational field strengthis the force with which tje planet Earth attracts any object towards it’s centre.

The gravitational field strength on Earth is 10 N/kg.

This means that a 1 kg mass would be attracted to Earth by a force of 10 N

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12
Q

What is the gravitational field strength on Earth?

A

The gravitational field strength on Earth is 10 N/kg.

This means that a 1 kg mass would be attracted to Earth by a force of 10 N

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13
Q

Calculate the weight:

An apple has a mass of 0.2 kg. Calculate the weight of the apple on Earth (g = 10 N/kg).

A

W = ?

m = 0.2 kg

g = 10 N/kg

Use the weight equation: W = M x g

and substitute in the values you know:

W = 0.2 x 10

The weight of the apple on Earth is 2 N.

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14
Q

How to calculate mass
A big textbook weighs 90 N. Calculate the mass of the book (g = 10 N/kg).

A

W = 90 N

m = ?

g = 10 N/kg

Remember to use the equation: W = m x g

Substitute in the values you know: 90 = m x 10

Now divide both sides by 10: 90//10 = (m x 10) / 10

9 = m

The mass of the book is 9 kg.

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15
Q

A student has a mass of 45 kg. The gravitational field strength on Earth is 10 N/kg. What is the weight of the student?

A

This is calculated by multiplying their mass by the gravitational field strength.

45 x 10 = 450.
The weight of the student is 450 N.

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16
Q

Explain what is WEIGHT

A

Weight is a result of gravity interacting with mass. This means that an object’s weight will change depending on the strength of the gravitational field acting on it.

17
Q

What is a NEWTON METER used for?

A

A force meter, also called a newton meter, is used to measure forces

18
Q

What is the key difference between MASS and WEIGHT?

A

the mass of an object is constant but its weight depends on the gravitational force.

19
Q

Convert from kg/m3 to g/cm3,

A

To convert from kg/m3 to g/cm3, divide by 1,000.

20
Q

Convert from g/cm3 to kg/m3

A

To convert from g/cm3 to kg/m3, multiply by 1,000.

21
Q

What is the equivalent of 1g/cm3 in kilograms?

A

Calculating density using grams and cubic centimetres would give a density unit of grams per cubic centimetre (g/cm³).

1 g/cm3 is equal to 1,000 kg/m3

22
Q

Iron has a density of 7.9 g/cm3 what is this in kg/m3 ?

A

Iron has a density of 7.9 g/cm3 what is this in kg/m3 ?

7.9 multiplied by 1,000 gives 7,900 kg/m3.

23
Q

What is the density of an object in kg/m3 if it is 6.531 g/cm3 ?

A

6.531 multiplied by 1,000 would give 6,531 kg/m3.

24
Q

To calculate density, the _________ of the material must be known.

A

To calculate density, the volume of the material must be known.

physics: mass density weight (3 decks)

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