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Physical science grade 12
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- 12th Grade
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lOMoARcPSD|23479258PHYSICAL SCIENCES
PAPER 2 AND PAPER 1
GRADE 12
TERMS & DEFINITIONS
QUESTIONS & ANSWERS
PER TOPIC
2019
AUTUMN CLASSES WEEK 1
This document consists of 33 pages.
Terms, definitions, questions & answers
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PROGRAMME
DAY ACTIVITY PAGE TIME
PRE-TEST 45 MIN
1 Electrostatics: One dimension (1D) 7-9 1 HOUR: 15 MIN
Give feedback: pre-test (Only electrostatics) 30 MIN
2
Electrostatics: One and two dimension (1D and 2D) 10 - 12 1 HOUR 30 MIN
Energy graphs (Endothermic and exothermic graphs) 16 - 19 45 MIN
3
Basic concepts of mole, Empirical formula, percentage composition. 24-25 1 HOUR: 15 MIN
33 - 36
4 Stoichiometry 26 – 32 2 HOURS
36 - 38
Summary: Electrostatics, Energy graphs, Stoichiometry. 2 HOURS
5
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PHYSICAL SCIENCE
GRADE 12
3
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Topic 14: Electrostatics (Grade 11)
Coulomb's law
State Coulomb's law: The magnitude of the electrostatic force exerted by one point
charge (Q1) on another point charge (Q2) is directly proportional to the product of
the magnitudes of the charges and inversely proportional to the square of the
distance (r)between them:
kQ1Q2
Solve problems using the equation F = for charges in one dimension (1D) (restrict
r2
to three charges).
kQ1Q2
Solve problems using the equation F = for charges in two dimensions (2D) – for
r2
three charges in a right-angled formation (limit to charges at the 'vertices of a right- angled
triangle').
Electric field
Describe an electric field as a region of space in which an electric charge experiences a
force. The direction of the electric field at a point is the direction that a positive test
charge would move if placed at that point.
Draw electric field patterns for the following configurations:
o A single point charge
o Two point charges (one negative, one positive OR both positive OR both negative)
o A charged sphere
Define the electric field at a point: The electric field at a point is the electrostatic
F
force experienced per unit positive charge placed at that point. In symbols: E .
q
F
Solve problems using the equation E
q
.
Calculate the electric field at a point due to a number of point charges, using the equation
kQ
E 2 to determine the contribution to the field due to each charge. Restrict to three
r
charges in a straight line.
ELECTRICITY AND MAGNETISM: ELECTROSTATICS
Coulomb's law The magnitude of the electrostatic force exerted by one point charge on
another point charge is directly proportional to the product of the magnitudes
of the charges and inversely proportional to the square of the distance (r)
kQ1Q2
between them. In symbols: F =
r2
Electric field A region of space in which an electric charge experiences a force.
Electric field at a The electric field at a point is the electrostatic force experienced per unit
point positive charge placed at that point.
F
In symbols: E Unit: N∙C-1
q
Direction of electric The direction of the electric field at a point is the direction that a positive test
field charge would move if placed at that point.
4
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