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Physics Unit 1 > Materials > Flashcards

Materials Flashcards

1
Q

What is density?

A

Mass/Volume

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2
Q

How do you work out the volume of a sphere?

A

4/3pir^3

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3
Q

What is viscosity?

A

The resistance to flow

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4
Q

If a liquid has a high viscosity, will the liquid flower faster or slower?

A

Slower

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5
Q

What is viscous drag?

A

The resistive force by a solid moving through a liquid

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6
Q

What is upthrust?

A

The weight of fluid displaced

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7
Q

How do you calculate the upthrust? (4)

A

Work out the volume of the object
This is equal to the fluid displaced
Calculate mass of fluid displaced (p=m/v)
Calculate the weight of fluid displaced (w=mg)

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8
Q

Describe the characteristics of laminar flow (3)

A

Same direction
Parallel layers
No abrupt change in speed

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9
Q

Describe the characteristics of turbulent flow (3)

A

Eddie currents

Mixed up layers
Abrupt change in speed

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10
Q

What is the limit of proportionality?

A

A point beyond which behaviour no longer conforms to Hooke’s law

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11
Q

What is the elastic limit?

A

A point beyond which the spring will no longer return to its original shape when the force is removed

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12
Q

What is the yield point?

A

The point at which the material starts to stretch with any extra load

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13
Q

What are the units for stress?

A

Nm^-2

Pa

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14
Q

What is the young modulus?

A

Stress/Strain

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15
Q

State Hooke’s law

A

F=kx

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16
Q

What’s is tensile strength?

A

The greatest stress a material can undergo before fracturing

17
Q

How does a golf ball have a longer range in air, than a normal ball? In terms of area (2)

A

Less resistive force

Less deceleration

18
Q

What is elastic potential energy?

A

The energy stored in a body due to a load causing a deformation

19
Q

What is a compressive force?

A

A force applied to a material such as a spring that causes it to compress

20
Q

What is a tensile force?

A

A force applied to a material such as a spring that causes it to stretch

21
Q

How could you produce a greater extension for a given mass?

A

Use a thinner wire

Physics Unit 1 (3 decks)

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