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conservation of energy Flashcards

1
Q

kinetic energy

A

kinetic energy =
0.5× mass × speed2

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2
Q

gravitational potential energy

A

GPE = mass × gravitational field strength × height

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3
Q

power=

A

work done/time taken

energy transferred/ time taken

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4
Q

change in thermal energy =

A

mass × specific heat capacity × temperature change

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5
Q

elastic potential energy

A

0.5 × spring constant x (extension)2

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6
Q

distance travelled

A

average speed x time

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7
Q

force

A

mass x acceleration

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8
Q

velocity

A

acceleration x time

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9
Q

energy transferred

A

efficiency x energy supplied

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10
Q

energy transferred

A

efficiency x energy supplied

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11
Q

A sports scientist analyses an athlete’s throw to help improve performance. The scientist takes pictures of the athlete every 0.1 s during one throw.

Explain how the scientist could improve this method of analysing the throw.

A

take pictures more frequently
in order to determine the exact time of release

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12
Q

A student investigates how the average speed of the trolley varies with starting height.

Describe how the student can determine the average speed of the trolley.

A

measurement of time between 2 distances
measure of distances along the runway
measure of vertical to starting position

average speed= distance travelled/time

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13
Q

The water in the panels reaches a constant temp even tho still absorbing energy from sun.
Why

A

Heat is lost
Heat is gained

Heat is lost=heat is gained

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14
Q

Energy transfer from bunsen burner

A

Chemical to thermal

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15
Q

Explain why heating the water using a kettle and bunsen burner waste different amounts of energy

A

Kettle is insulated
Kettle keeps in more energy

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16
Q

The energy reaching the ISS from the sun is carried by waves which are

A

Transverse and electromagnetic

17
Q

Pro and con of tidal power

A

Pro
Renewable
Reliable
Reduces reliance of fossil fuels

Cons
Not continuous
Exoensuve
Disturbes wild life like fish
High cost

18
Q

Explain why changing halogen lamps for energy saving lamps wont keep chicks warm

A

May have to use more lamps cause the lamps wont get that hot

19
Q

Compare hydro and solar

A

Both renewabke
Both saves fossil fuels
Hydro only possible in some locations so can damage environment
Solar aint reliable
Dependent on sunshine

20
Q

Pro and con of nuclear power

A

Last long time
No co2
No sulfur dioxide
Dont add to global warm
Reliable

Cons
Radioactive waste
Waste material that cant be normally exposed
Accidents
Isnt trusted

21
Q

Why r the pipes on solar power black

A

Good absorber of heat
Takes in more energy

22
Q

Antarctic ice melts surface area decreases
Area of water surface increases

What happens to the amount of radiation absorbed

And what effect will it have on the water

A

More radiation is absorbed
Water reflects less than ice

Temp rises

23
Q

Kettle energy transfer

A

Electrical to thermal

24
Q

Barbacue energy transfer

A

Chemical to thermal

25
Q

What colour absorbs the most

A

Black rough

26
Q

Guy throws egg
State energy changes

A

Chemical to kinetic (in his hand)
Kinetic to gpe
Gpe to kinetic
0m sound and thermal energy

27
Q

State at what point in a bungee jump does student have most kinetic energy

A

When the cord goes straught
At the bottom

28
Q

Solar cell energy transfer

A

Light to electrical

29
Q

The screen of the solar cell takes in energy from the sun
State how energy gets from sun to screen

A

Carried by electro magnetic waves

30
Q

Why heat on battery different to heat on oven

A

Heat on over power much higher so more heat

31
Q

Kmph to ms

A

Divide kmph by 3.6

32
Q

Change in gpe

A

Height increase x acceleration x mass

33
Q

When button pressed spring is released that projects the trolley up the track
Rolls back down
Investigate how the mass of the trolley affects the maximum vertical height
State measurements needed

A

Mass of trolley
Measure vertical height
Repeat with different masses

34
Q

That trolley experiment
How could he extend investigation to calculate average speed rolling back

A

Measure distance along runway from max height

Start watch when trolley stops
Stop when hits spring

Speed=distance/time

gh (11 decks)

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