These notes are provide detailed information on the forces chapter in the Mind Action Series Physical Science Grade 12 textbook. These notes are colourful, have diagrams for further explanation and are very easily understood.
Forces
Chapter 2
Free Body Diagram:
push / pull (is a vector)
•represent obj w/ dot
•1 N = when 1kg accel @ 1m.s-2
𝐹𝑁
Types of Forces: 𝐹𝐹 𝐹𝐴
Weight (Fg) : grav force bet earth &
object
- acts down towards center of earth
(accelerates at 9.8m.s-2) 𝐹𝑔
- vector (Newtons)
Mass : quantity of matter found in Explanations:
object 𝐹𝑁 : Normal force of surface on
- scalar (kg) car
- mass x change but weight change 𝐹𝐴 : Applied force of engine on car
depending on position in universe 𝐹𝑔 : Gravitational force of earth
that changes the grav acceleration
on car
Fg = mg
𝐹𝐹 : Frictional force of surface on
(g = grav accel of earth 9.8m.s-2)
car
Normal: (Fn)
force = exerted by surface on an Adding Forces
object w/ which it is in contact Add 2 find resultant (same
- is perpendicular to surface (90°) & effect as combo of indiv forces)
= to force that object exerts on Forces Acting in a Straight
surface Line:
- needs to be in contact +/- 2 show direct
Friction: (Ff) w/e act same direct angle
force that acts to oppose motion between = 0° & will have maximum
- caused by dragging over another btw forces
surface & acts parallel to surfaces w/e act opp direct angle between
that are in contact = 180° & will have minimum value
- heavier objects = more friction & Forces Acting at 90°
increase by pressing obj against 2 forces act @ right angle 2 e/o
e/o draw rect/paralellogram 2 add
Tension: (Ft) Forces form the sides
force that acts through a rope when it The diagonal gives
is stretched (pulling force) magnitude &
- acts along the rope from the direct of 𝐹𝑅
object that exerts pulling force
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