= Start from the energy from the source ( xx energy from xx) ----> xx energy from xx --------> xx energy + sound energy
(a) Pupils forget to write "Energy" = no marks (YES JUNWEN, just write the source)
(b) Pupils forget to start from the source of the energy./
(c) Pupils do not know what is the source of the energy.
E.g. elastic rubber band
[ Gravitational potential energy --> Elastic potential energy --> Kinetic energy = 0 marks]
Explanation:
(The elastic rubber band can be on the floor and when it is stretched, it still can move forward. The source of energy comes from the Rubber Band being stretched not the height)
(The elastic rubber band can be on the floor and when it is stretched, it still can move forward. The source of energy comes from the Rubber Band being stretched not the height)
Correct Answer:
[ Elastic potential energy --> Kinetic energy of rubber band --> Kinetic energy of the box --> Sound and heat energy = 1 mark]
(d) Pupils miss out 1 step
1 missing energy = 0 marks
E.g. swinging a golf club to hit a golf ball
(d) Pupils miss out 1 step
1 missing energy = 0 marks
E.g. swinging a golf club to hit a golf ball
Correct Answer:
[ Chemical potential energy (from the person who swing it) --> Kinetic energy (of the golf club)---> Kinetic energy (of the golf ball) + Sound energy (sound from the golf ball hit) + Heat energy (Friction) ] = 1 mark
Wrong Answer:
[ Chemical potential energy (from the person who swing it) --> Kinetic energy (of the golf club)--->Sound energy (sound from the golf ball hit) + Heat energy (Friction) ] = 0 marks
[ Chemical potential energy (from the person who swing it) --> Kinetic energy (of the golf club)--->Sound energy (sound from the golf ball hit) + Heat energy (Friction) ] = 0 marks
Explanation:
It is from the moving rubber band (Kinetic Energy) that transferred to the moving box (Kinetic Energy) that cause it to move. (missing Kinetic energy of golf ball)
Wrong Answer:
[ Chemical potential energy (from the person who swing it) --> Kinetic energy (of the golf ball) --> Kinetic energy (of the golf club) + Sound energy (sound from the golf ball hit) + Heat energy (Friction) ] = 0 marks
[ Chemical potential energy (from the person who swing it) --> Kinetic energy (of the golf ball) --> Kinetic energy (of the golf club) + Sound energy (sound from the golf ball hit) + Heat energy (Friction) ] = 0 marks
Explanation:
It is from the moving rubber band (Kinetic Energy) that changed to the moving box (Kinetic Energy) that cause it to move. (changed to - must show with an arrow not a plus)
We will go through more on Thursday as we finish Chapter 2 ws 2 and ws 3.
To do : Science activity correction, Ws 2, Ws 3, Spelling, Corrections for T1-2, T3, Term Test
4 comments:
from gravitation potential energy changes to kinetic energy.
I know what to do and I will not make this mistake.
there is a mistake in the title:Sccience....,Ms Wen is science...
[ Chemical potential energy (from the person who swing it) --> Kinetic energy (of the golf ball) --> Kinetic energy (of the golf club) + Sound energy (sound from the golf ball hit) + Heat energy (Friction) ]
:( i go write this thingi.. :(:(:(
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