Physics stpm term 1 module 1 marking scheme_kelantan2016
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PENGGAL 1 960/1 STPM 2016 JABATAN PENDIDIKAN NEGERI KELANTAN SIJIL TINGGI PERSEKOLAHAN MALAYSIA PHYSICS 1 (FIZIK 1) SKEMA MODUL 1 1 D 6 B 11 B 2 C 7 C 12 C 3 D 8 C 13 A 4 B 9 C 14 D 5 A 10 C 15 C
Transcript of Physics stpm term 1 module 1 marking scheme_kelantan2016
PENGGAL 1 960/1 STPM 2016
JABATAN PENDIDIKAN NEGERI KELANTAN
SIJIL TINGGI PERSEKOLAHAN MALAYSIA
PHYSICS 1 (FIZIK 1)
SKEMA MODUL 1
1 D 6 B 11 B 2 C 7 C 12 C 3 D 8 C 13 A
4 B 9 C 14 D 5 A 10 C 15 C
19. (a) stress is force per unit cross sectional area
Strain is extension produced by the force per unit original length.
(b)
(c) (i) loss in the gravitational potential energy = mgh
=
(2.0)(9.81)(20x10-3
)
= 0.392 J
(ii) Energy stored in elastic thread = ½ FE
= ½ (2.0x9.81)(20 x 10-3
)
= 0.196 J
(iii) Energy difference = (0.392 – 0.196 )J
= 0.196 J is energy dissipated as heat.
(d) Rubber consists of long molecules that are entangled.
When stretched, the entangled molecules straightened.
This explains the large extension produced by a small force.
During unloading, the molecules entangled together again
And energy is dissipated as heat
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(a) stress is force per unit cross sectional area
Strain is extension produced by the force per unit original length.
(b)
(c) (i) loss in the gravitational potential energy = mgh
=
(2.0)(9.81)(20x10-3
)
= 0.392 J
(ii) Energy stored in elastic thread = ½ FE
= ½ (2.0x9.81)(20 x 10-3
)
= 0.196 J
(iii) Energy difference = (0.392 – 0.196 )J
= 0.196 J is energy dissipated as heat.
(d) Rubber consists of long molecules that are entangled.
When stretched, the entangled molecules straightened.
This explains the large extension produced by a small force.
During unloading, the molecules entangled together again
And energy is dissipated as heat
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