Energy Flashcards
Def of kinetic energy
All moving things eg. a roallarcoaster
Def of thermal energy
The energy of a substance or an object store because of its temp
Eg. Hot chocolate
Def of elastic potential energy
The energy stored in a springy object when you stretch or squash it
Eg. A hairband
Def of gravitational potential energy
The energy stored in an object because of it’s position above the ground
Eg. Bungee jumping
Is energy ever used up?
NO, it is just transferred between objects
Def of mechanical working
-Includes soundwaves
-involves a force
-surfaces being in contact
Def of electrical working
-via current(through wires)
Def of heating by particles
-heat moving from one place to another via conduction and convention
Def of heating by radiation
-heat radiation
-any electromagnetic waves (light waves)
What is the principle of conservation of energy
ENERGY CANNOT BE CREATED OF DESTROYED only transferred from one store to another
What stores of energy does a kettle boiling go through
Electrical working>thermal/internal energy store of the heating element>heating by particles>thermal/internal energy store of the water
What stores of energy does a ball thrown in the air go through
Chemical energy store of the arm muscles>mechanical working>kinetic energy store of the arm and the ball>mechanical working> gravitational potential>gravitational potential energy store of the ball
What stores of energy does a car braking go through
Gravitational potential energy store of the ball>mechanical working>kinetic energy store of the ball
Energy transferred = ?
Work done
W= ?
WORK measured in J, joules
F=?
FORCE measured in N, newtons
S=?
DISTANCE
How do u find W?
W=fxs
How do you dine F?
F=w/s
How do you find s?
S=w/f
Find work (J) fxs
F= 50
S= 5meters
5meters x 50 = 250 J
Find work (J) fxs
F= 3
S= 5meters
3 x 5 = 15J
Find work (J) fxs
F= 20
S= 40meters
20 x 40 = 800J
Find force (N) w/s
W= 20
S=5
20/5=4N
Find force (N) w/s
W= 300
S=6
300/6=50N
Find force (N) w/s
W= 1000
S=200
1000/200=5N
Find distance (M) w/f
W=300
F=6
300/6=50M
Find distance (M) w/f
W=2000
F=80
2000/80=25M
Mass def
Mass is a measure of the amount of physical material an object is comprised of with the unit KG
Weight def
Weight is a measure of the force from gravity acting on a mass with the unit N
W=?
Weight N
g=?
Gravitational field strength N/KG
m=?
Mass KG
Find W mxg
m=20
g=9.8
20x3=60N
Find W mxg
m=600
g=9.8
600x10=6000N
Find m w/g
W=500
g=9.8
500/50=10KG
Find m w/g
W=6000
g=9.8
6000/300=20KG
Find g w/m
W=40
s=2
40/2=30N/KG
Find g w/m
W=1000
s=250
1000/250=4N/KG
Def of gravitational potential energy
Gravitational potential energy (GPE) is the energy stored by an object by its position above the ground
Eg=?
Gravitational potential energy J
m=?
Mass KG
g=?
GPE N
h=?
Height M
Find m eg/gxh
Eg=
