Forces are contact forces or field forces.
When two bodies are in contact with each
other, contact forces can result e.g. friction,
twisting, pulling or pushing forces.
Forces are contact forces or field forces.
Field forces (non-contact forces) work over a
distance e.g. gravity, electrostatic forces and
magnetism.
A force can ...
make a moving object
stop.
cause a stationery
object to move.
change speed of
moving object.
change direction of
moving object.
change shape of
object.
have no effect at all.
Force of attraction that
two bodies have on
each other as a result
of their mass.
1.
The bigger the
mass, the stronger the
force of attraction.
2.
The smaller the
distance the stronger the
force.
Weight on Earth
calculated using
formula: F = mg
F = force (gravitation),
m = mass, g =
gravitational
accelleration of
9,8 m/s2.
Weight of 50 kg person
on Earth = 50 x 9,8
= 490 N
Weight on moon?
50 x 1,6 = 80 N
g on moon = 1,6 m/s2
MASS vs WEIGHT
Mass stays the same, weight
different on earth and moon
Charge
cannot be created
or destroyed, it can only
be transferred or
distributed.
Like poles (N and N, or S and S) repel each
other.
Opposite poles (N and S) attract each other.
We know that the apple probably didn’t fall
on Newton’s head, but a falling apple made
him think about gravity ... as well as many
other concepts.
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