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physics > energy conservation > Flashcards

energy conservation Flashcards

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AP® Physics flashcards Physics 101 flashcards
1
Q

What is a system

A

objects or group of objects

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2
Q

what happens in terms of energy when an object is projected upwards

A

it gains gravitational potential energy and kinetic energy decreases

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3
Q

what happens in terms of energy when a moving object hits an obstacle

A

the kinetic energy is transferred to heat and sound and kinetic energy if that obstacle that was hit

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4
Q

what happens in term of energy when an object is accelerated by a constant force

A

work is done by a force on an object. this work is converted to the objects kinetic store

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5
Q

what happens in terms of energy when a vehicle is slowing down

A

the kinetic energy of the vehicle decreases while energy is dissipated through heat and sound

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6
Q

what happens in terms of energy when water is brought to boil in an electric kettle

A

energy transfers from the electrical store of the mains power supply ti the thermal store of water

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7
Q

what is the formula for kinetic energy

A

kinetic energy=0.5 x mass x (speed)squared

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8
Q

what js the unit for kinetic energy

A

joules, J

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9
Q

what is the unit for mass

A

kilograms Kg

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10
Q

what is the unit for speed

A

metres per second m/s

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11
Q

what is the unit for elastic potential energy

A

Joules J

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12
Q

what is the unit for speing constant

A

newtons per metre

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13
Q

what is the unit for extension

A

metre, m

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14
Q

what is the formula for gravitational potential energy

A

gpe= mass x gravitational field strength x height

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15
Q

what is the unit for gpe

A

Joules J

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16
Q

what is the unit for gravitational field strength

A

newtons per kilogram N/kg

17
Q

what is the unit for height

A

metres, m

18
Q

what is the definition of power

A

the rate at which energy is transferred or the rate at which work is done

19
Q

what formula would you use to calculate power if you had a value for energy transferred

A

power = energy transferred/time

20
Q

what formula would you hse to calculate power if you had a value for energy transferred

A

power= work done/time

21
Q

what is the unit for power

A

Watts W

22
Q

what is the unit for wnergy transferred

A

Joules J

23
Q

what is the unit for time

A

Second S

24
Q

what is the unit for work done

A

Joules J

25
Q

what is an energy transfer of 1 Joule per second equal to

A

1 Watt

physics (11 decks)

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