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Science Form 2 Unit 8: Force and Motion, image, image, image, image, image…
Science Form 2 Unit 8: Force and Motion
Force
Meaning
Force
push/pull upon object
Types of Forces
Gravitational force
Force act toward centre of Earth
cause objects to fall on Earth
Frictional force
Force oppose motion of object
when 2 surface in contact
Normal force
Force produced when
object in contact with surface
Elastic force
Exists when elastic objects
stretched
compressed
Buoyant force
Thurust force applied on
object
floating on water
Characteristics of force
Meaning
Force = vector quantity
which has magnitude/direction
Point of application of force
is point where force applied on object
Force measured with
spring balance
operate based on principle of spring extension
S.I. unit for force
Newton (N)
object with mass of 1 kg
has weight 10 N
Effects of Force
effects
Change direction of moving object
Stop a moving object
Move stationary object
Change shape of object
Change speed of object
Buoyant Force
When object in water
experience 2 force
which are
weight of object
buoyant force
Formula
Buoyant force = Actual weight - apparent weight
Lever
is a simple machine
enable to do work easily
made of bar that rotate
on fixed point (fulcrum)
Moment of Force
turning effect produced when force is exerted
on the object
=
moment of force
Enable to do work easily
depends on
force applied
perpendicular distance from force to pivot
Formula
Moment of force = Force (N) x perpendicular distance form pivot to force (m)
will increase when
for applied increases
perpendicular distance from pivot to force increases
Pressure
is force per unit surface area
S.I. unit
Pascal (Pa)
Formula
Pressure (N m−2) = Force (N) / Surface area (m²)
Gas Pressure
Air is made up of
fine & discrete gas particle
Kinetic theory of gas state
Air molecule always move freely
Air molecule collide against container wall
Collisions produce force
that push wall of container known as air pressure
