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Physics > P1 > Flashcards

P1 Flashcards

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1
Q

What are all the ways in which energy can be stored

A

Chemical,Kinetic,Gravitational potential,Thermal,Elastic potential,Magnetic,Nuclear,Electrostatic

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2
Q

How does energy get lost

A

When it is dissipated to the surroundings

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3
Q

If a ball hits the ground will it return to it’s height it was dropped from

A

No due to it losing energy in the thermal energy store,sound store and going back into gravitational potential energy

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4
Q

What is the equation for work done

A

W=ForceX distance

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5
Q

Calculate the work done when a person applies a force of 250N to move a box moving it 31M

A

W=FXS
250X31
7750J

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6
Q

Equation for gravitational potential energy

A

Delta Ep=mXgx deltah

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7
Q

Calculate the gravitational potential energy gained if a 10kg object is lifted 12m high

A

Gpe=mxgxh,10x9.8x12=1176

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8
Q

Equation for kinetic energy with mass and velocity

A

1/2XmassXvelocity

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9
Q

Calculate the kinetic energy stored in a vhicle of mass 500kg moving at a speed of 12m/s

A

500X12^2/2=36000

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10
Q

What does hooke’s law state

A

That if you double the force you also double the extension as long as the limit of proportionality hasn’t been reached

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11
Q

How do you calculate energy efficiency

A

Useful output energy/total input energy

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12
Q

What is the useful energy % if a hairdryer has a total input of 500j and a useful output of 200j

A

200/500X100=40%

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13
Q

How could you improve the efficiency of a bycicle

A

Use oil or lubricant in order to reduce friction

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14
Q

What is the equation for power using energy and time

A

Power=energy/time

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15
Q

A light bulb is on for one hour and uses 144000J of energy,What is the light bulbs power rating

A

144000/3600s=40w

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16
Q

What is a system

A

Its the word for a single object/a group of objects

17
Q

What is the net change in the total energy of a closed system

A

Zero

18
Q

Equation for change in thermal energy

A

Change in thermal energy=massXspecific heat capacityXtemperature change

19
Q

What practical investigates specific heat capacity

A

The practical where you use a block of the material and wrap it in an insulating layer before measuring the temperature and then setting the power supply on.Take readings of the temperature during (about 10) and then record your results after turning it off

20
Q

What are the two equations for power

A

Power=energy transferred/time
Power=Work done/time

Physics (10 decks)

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