Density and pressure Flashcards

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1
Q

Define density.

1 mark

A

Density is the Mass per unit Volume.

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2
Q

What is the formula for density?

1 mark

A

Denity = Mass ÷ Volume

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3
Q

What is density measured in?

2 marks

A

Either g/cm³ or kg/m³

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4
Q

Liquid water has a density of 1.0g/cm³, while ice has a density of 0.92g/cm³.
Calculate the volume occupied by 250g of:
i) liquid water
ii) ice

6 marks

A

i) Volume = Mass ÷ Density
Volume = 250 ÷ 1
Volume = 250cm³

ii) V = M ÷ D
V = 250 ÷ 0.92
V = 271.74cm³

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5
Q

Define pressure.

1 mark

A

Pressure is the Force per unit Area.

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6
Q

What is the formula for pressure?

1 mark

A

Pressure = Force ÷ Area

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7
Q

What is pressure measured in?

2 marks

A

Either N/m² or N/cm²

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8
Q

What is an alternative for N/m²?

1 mark

A

1N/m² = 1 Pa (pascal)

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9
Q

Find the pressure when the force applied is 200N and the surface area is 23cm².

3 marks

A

p = F ÷ A
p = 200 ÷ 23
p = 8.70N/cm²

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10
Q

Calculate the area if an object creates a pressure of 25 Pa when acting from the force of 300N.

3 marks

A

A = F ÷ p
A = 3000 ÷ 25
A = 120m²

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11
Q

Pressure acts at an angle of ……….°?

1 mark

A

90°

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12
Q

The smaller the area the 1)………. the pressure. The larger the area the 2)………. the pressure.

2 marks

A
  1. Higher
  2. Smaller
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