A - fossil fuel C - Wind energy D - Hydroelectric Renewable energy source : Wind energy / hydroelectric energy
3
2
a
P or R
1
b
potential energy
1
c
Potential energy
a
c d a
Kinetic energy -/
Potential energy
-/
Kinetic energy
i. N ii. M/L iii. M/L iv. N the total energy is the same i. Light Light energy ii. Kinetic energy p = potential energy S= kinetic energy
c d a
6
2 1
5
1 2
1 chemical energy electric energy
b
6
7
1
-/
TOTAL
1
c
b
5
(a)TV mechanical energy Boy singing sound energy Lightning bulb light energy Food chemical energy A stretched cord of a bow potential energy Top spinning kinetic energy Electrical energy heat energy + light energy
Non renewable energy source : Fossil fuel does not pollute the environment
d 4
MARKS
CHARACTERISTICS
2 6 2 3
1 3 2 P /S P / R R Q kinetic energy , potential energy i. lime water changes to cloudy ii. carbon dioxide is released when sugar is heated iii.carbon dioxide is released when sugar is heated
2 2
9
5
1
7
b
burning sugar releases / produces energy
1
c
2
d
manipulated variable - oxygen responding variable - lime water turn cloudy water, gas carbon dioxide, energy
e
water, gas carbon dioxide, energy
2
a
P : sun energy Q : fossil fuel R : wind energy S: water energy T : animals and plants i. Group 1
