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Question 1

What is the equation for work done?

Answer 1

Work done = Force x change in displacement

Question 2

What is the equation for GPE?

Answer 2

GPE = 9.8 x height x mass

Question 3

What is the equation for kinetic energy?

Answer 3

kinetic energy = 0.5 x mass x V2

Question 4

What is the equation for elastic potential energy?

Answer 4

EPE = 0.5 x k x X2

Question 5

How do you work out the force of a gas?

Answer 5

Force = pressure x area

Question 6

How do you work out the pressure of a gas?

Answer 6

Pressure = force/area

Question 7

What is thermal equilibrium?

Answer 7

When two systems in thermal contact but there is no noet transfer of heat because they have reached the same temperature.

Question 8

What is internal energy?

Answer 8

Internal energy is the sum of the kinetic and potential energy of the particles.

Question 9

What is temperature?

Answer 9

the average kinetic energy of the particles.

Question 10

What is Adiabatic?

Answer 10

it is fast, temp can be changed, work done is due to change in the internal energy. Q=0 and delta U = -W

Question 11

What is isothermal?

Answer 11

is slow, temperature is constant, work done is due to the change in the net heat content of the system. delta U= 0 and Q=W

Question 12

What is the equation for stress? and what is stress?

Answer 12

Stress is defined as the force per unit area of a material. Stress= force/area and is measured as N/m2

Question 13

What is strain and what is the equation?

Answer 13

Strain is defined as extension per unit length. Strain= extension/length.

Question 14

in the equation delta W = p x delta v

what does W, P and V stand for?

Answer 14

W= work done
P= pressure
V= volume

Question 15

What is thermal equilibrium?

Answer 15

two physical systems are in thermal equilibrium if there is no net flow of thermal energy between them when they are connected by a path permeable to heat. And they are in thermal contact and eventually reach the same temp.

Question 16

In the equation delta q = mL what does delta q, m mean?

Answer 16

q = change in heat
m = mass

Question 17

In the formula Q = delta U = W what does delta U, Q and W mean?

Answer 17

delta U = change in internal energy
Q = heat added
W = work done

Question 18

What is internal energy?

Answer 18

The sum of potential and kinetic energy?

Question 19

What is the definition of a brittle material?

Answer 19

They show little to no plasticity and break under pressure such as nylon or graphite.

Question 20

What is the definition of a ductile material?

Answer 20

It is able to be shaped under pressure such as fishing rods or underground tubes.

Question 21

What is creep deformation?

Answer 21

Slow plastic deformation which increases with temperature. such as blades on a fan.

Question 22

what is malleable?

Answer 22

To be shaped by plastic flow under compression such as lead and clay.

Question 23

What is fatigue?

Answer 23

It is caused by repeated cycles of loading and unloading such as concrete or bridge support.

Question 24

characteristics of laminar flow.

Answer 24

parallel paths/flow. Slow and constant. Less air resistance.

Question 25

characteristics of turbulent flow.

Answer 25

irregular flow (whirl pooles/eddies). Fast but not constant. More air resistance.

Question 26

What is Zeroth law?

Answer 26

Temperature is a measure of the average kinetic energy of the particles. If two thermodynamic systems are each in thermal equilibrium with a third, then they are in thermal equilibrium with each other.

Question 27

What is the energy law?

Answer 27

Delta U=Q-W. | The change in internal energy of a system is equal to heat added to the system minus the work done by the system.

Question 28

What is the second law?

Answer 28

Entropy (disorder) always increases. Not to be reversed entirely. heat will not flow from cool to hot. it is impossible to change heat into work. Cannot reverse the direction of time.

Question 29

What is Bernoulli's principle?

Answer 29

At any point in a smooth flowing fluid (streamline) the sum of the pressure energy, the potential energy and the kinetic energy is equal. kinetic + potential + pressure = constant

Question 30

What is dilatant?

Answer 30

Thick when a shear force applied. viscosity increases with a rise in shear strain. such as dilatant fluid.

Question 31

What is a pseudoplastic

Answer 31

Thins when shear force applied. viscosity decreases with a rise in shear strain. such as paint.

Question 32

What is rheopectic?

Answer 32

Time-dependant thickening on stirring. More viscous over time, when shaken or otherwise stressed. such as synovial fluid.

Question 33

What is thixotropic?

Answer 33

Time-dependant thinning on stirring. Less viscous overtime when shaken or otherwise stressed. such as yoghurt.

Question 34

What is a Bingham plastics?

Answer 34

Behave like solids at low stress but flow above yield stress. Solid at stresses and as a viscous fluid at higher stresses. such as toothpaste.

Question 35

What is the equation for specific heat capacity?

Answer 35

``` Q = mc∆T The mass m specific heat c change in temperature ΔT and heat added (or subtracted) Q ```

Question 36

Describe what is meant by the term thermal capacity.

Answer 36

the amount of thermal energy added to the metal plate which gives a change in temperature of unit change.

Question 37

What is adiabatic?

Answer 37

An adiabatic process occurs without transfer of heat or mass of substances between a thermodynamic system and its surroundings. In an adiabatic process, energy is transferred to the surroundings only as work.

Question 38

Explain how the shape of the wing enables an aeroplane to fly.

Answer 38

Pressure difference produces an upward force. The curve on the top of the wig causes low pressure air. The flat underwing causes high pressure air.

Question 39

State what is meant by the term isothermal expansion.

Answer 39

(an expansion that) happens at a constant temperature.