Energy Flashcards
1
Q
State the conservation of energy
A
Energy cannot be created or destroyed. It can only be changed from one form into another.
2
Q
Forms of energy
A
Kinetic Heat Chemical Potential Light Nucleur Electrical Sound
3
Q
What is the most common type of wasted energy?
A
Heat energy
4
Q
Gravitational field strength
A
The gravitational field strength is the force of gravity acting on 1kg of mass.
5
Q
What happens when the force of friction acts?
A
When the force of friction acts, kinetic energy is converted into heat energy. Heat is often a wasted form of energy.
6
Q
Work done formula (object moved horizontally by a force)
A
Ew = Fd
Ew = work done (J) F = force (N) d = distance (metres)
7
Q
Potential energy formula
A
Ep = mgh
Ep = potential energy (J) m = mass (kg) g = gravitational field strength (9.8 Nkg-¹) h = vertical height (metres)
8
Q
Kinetic energy formula
A
Ek = 1/2 mv²
Ek = kinetic energy (J) m = mass (kg) v² = speed (ms-¹)
9
Q
Formula for falling objects
A
Ek gained = Ep lost
1/2 mv² = mgh
(Mass cancels out)
(Assuming no energy lost to heat due to air resistance)
