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GAMSAT (SIII) - Physics > Unit 7 - Work and Energy > Flashcards

Unit 7 - Work and Energy Flashcards

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1
Q

ENERGY __>

A

Measure of ability to do ork
Never destroyed
Only ever transformed from one form to another

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2
Q

One Joule is

A

When one N of force is applied to move an object throguh 1m

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3
Q

What is one calorie

A

The ammount of energy required to raise 1 kg of water by 1 deg

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4
Q

W=

A

Fd

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5
Q

Only the component of force that lies __________ to the dispalcement does work

A

Parallel

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6
Q

Rewrite the equation for Fh

A

W = Fxcos theta

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7
Q

Kinetic energy is

A

The energy an object has due to motion which depends on the mass and speed of the object

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8
Q

Ke =

A

1/2 mv^2

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9
Q

Ke is always

A

Positive

Due to v^2 being positive or 0

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10
Q

Delta Ke =

A

W net

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11
Q

Ke is a ________ quantity

A

scalar

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12
Q

GPE is

A

Potential an object has to do work as a result of being located at a particualr position in a gravitational feield

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13
Q

GPE =

A

mgh

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14
Q

What happens if you remove the force holding the object up

A

GPE converted to Ke of the falling object

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15
Q

Energy (E) =

A

Power X time

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16
Q

Give the 2 laws of newtons laws of gravitation

A

F = gm1m2 / r^2

GPE = -Gm1m2 / r

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17
Q

In mechanics what fundamental quantities are conserved

A

Energy, momentum and angular momentum

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18
Q

Total energy in an isolated system always

A

Remains the same

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19
Q

What is the equation that shows conservation of energy in an isolated system

Define the terms

A

Eki + Ugi + Usi = Ekf + Ugf + Usf + Ehf

Ek - kinetic
Ug - GPE
Us - elastic string potential
Eh = heat

i - initial
f - final

20
Q

summarise the equation stating conservation of energy in an isolated system

A

Potential/inital energy = final energy

21
Q

Define thermal energy

A

Energy contained within a system responsible for its temperature

22
Q

Heat is the

A

Flow of thermal energy

23
Q

Equation for change in thermal energy

Define the terms

A

Uk . Fn . d

Uk - coefficient of kinetic friction
Fn - normal force
d - distance

24
Q

What type of friction generates heat, which type doesnt

A

Force a static friction

Force of kinetic friction

25
Q

1W =

A

1 J per second

26
Q

Power is

A

The rate at which work is done

27
Q

3 equations for power

A

P = delta E / delta t

P = Fv

P = mav

28
Q

What is stress

A

force applied per unit of area

29
Q

What is strain

A

Extent of streching/compression produced as the material responds to stress is called the strain

30
Q

Equation of strain

A

Change in L / Original length

31
Q

What are the two types of deformation

A

Elastic and plastic

32
Q

Elastic

A

When stress removed it returns to original dimension

REVERSIBLE AND NON PERMANENT

33
Q

Plastic

A

Stress is so large that when removed it does not return to its orignal dimensions

IRREVERSIBLE AND PERMANENT

34
Q

Hookels law is the

A

Force required to strech an elastic object such as a metal spring is directly proportional to the extension of the spring

35
Q

F (Hookes Law0 =

A
  • kx
36
Q

Why must you take care when calculating the length of a spring

A

substracting the nominal (resting) length

37
Q

Youngs Modulus –>

A

Elastic modulus measures the resistance of a material to be elastically deformed

38
Q

The stiffer the material the ________ the Young’s modulus

A

Higher

39
Q

Young’s Modulus =

A

Stress/Strain

40
Q

How can you obtain k from Youngs Modulus

A

K = EA/L

E = youngs modulus 
A = area 
L = length
41
Q

Spring constant when k in serioes

A

k/2

42
Q

Spring constant when k in parallel

A

2k

43
Q

What is elastic potential energy

A

EPE is energy tored as a result of applying force to deform an elastic object

44
Q

EPE =

A

1/2.k.(delta x)^2

45
Q

What are the two patterns energy follows

A

1/2 ab^2

abc

GAMSAT (SIII) - Physics (20 decks)

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