Physics 1 - Energy and Energy resources (P1 - P3) Flashcards Preview

Physics > Physics 1 - Energy and Energy resources (P1 - P3) > Flashcards

Flashcards in Physics 1 - Energy and Energy resources (P1 - P3) Deck (13)
Loading flashcards...
1
Q

What is a closed system?

A

An isolated system in which no energy transfers take place out of or into the energy stores of the system.

2
Q

What is the equation for work done (energy transferred)?

A

Work done (Joules J) = Force applied F (Newtons N) x Distance moved along the line of action of the force S (Metres m)

3
Q

What is the equation for change in an object’s gravitational potential store?

A

Change in G.P.E store (J) = Weight (N) x Change of Height (m)

4
Q

What is the equation for change in G.P.E store?

A

Change in G.P.E store (J) = Mass (Kg) x Gravitational field strength (N/Kg) x Change of height (Metres m)

5
Q

What is the equation for kinetic energy?

A

Kinetic energy (Joules J) = 0.5 x mass (Kg) x speed2 (m/s squared)

6
Q

What is the equation of efficiency of a device?

A

Efficiency = Useful output energy (J) / Total input energy energy (J) (x 100 for percentage)

7
Q

What is power?

A

Rate of transfer of energy

8
Q

What is the equation of power?

A

Power (watts W) = Energy transferred to appliance (Joules J) / Time taken (Seconds s)

9
Q

What radiation is emitted from the sun?

A

Infrared

10
Q

What is the equation for specific heat capacity?

A

Energy transferred (Joules J) = Mass (Kg) x SH capacity (J/Kg per degree celsius) x Temp change (degree Celsius)

11
Q

What is the specific heat capacity?

A

The energy needed to change the temperature of 1kg of the substance by 1 degree celsius.

12
Q

What is a biofuel + example?

A

Renewable sources of energy. Biofuels such as methane and ehtanol can be used to generate electricity.

13
Q

What is the equation for gravitational potential energy?

A

G.P.E = Mass (Kg) x Gravitational field strength x Height (m)