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Forces Notes #4: Newton’s Laws
Newton’s 1st Law: Law of Inertia
What does Newton’s 1st Law
of Motion say?
1. All objects have ________________
(the tendency to __________ change
in motion).
2. An object will only change its motion
if ___________________ forces act
on it .
What is Inertia?
Tendency for an object to ___________
_____________________________.
Objects with ______________ have
__________________which means it is
harder to change their velocity.
Objects with ______________ have
__________________ so it is easier to
change their velocity.
Which has more inertia?
A 5 kg ball with a volume of 5 cm3
A 10 kg ball with a volume of 1 cm3
What happens to an object if
balanced forces are exerted
on it?
The object’s velocity _______________
The object is either ________________
or moving in a ____________________
_______________________________.
Net force = ______
What happens to an object if
unbalanced forces are exerted
on it?
The object’s velocity _______________
It will ___________________________
_______________________________
Net force = ________________
Newton’s 2nd Law: F = ma
What does Newton’s 2nd Law
of Motion say?
1. The force an object can exert
depends on the object’s _________
and _____________________.
How do I calculate Force?
Force = ______
Acceleration = ______
Mass = _____
Force = ________ x _______________
What happens to the force of an
object if you double the mass?
When you double an objects ________,
you ____________the force it can exert.
F = ma
F = (2kg)(10m/s2)
F = _________
What happens to the force an
object can exert if you double
the acceleration?
F = ma
F = (4kg)(10m/s2)
F = _________
When you double an objects acceleration
you _______________________ it can
exert.
F = ma
F = (10kg)(5m/s2)
F = _________
F = ma
F = (10kg)(10m/s2)
F = _________
Newton’s 3rd Law: Action/Reaction
What does Newton’s 3rd Law of
Motion say?
The forces are ___________ and
_____________________.
Forces come in _______________.
Summary: Write 3 complete sentences explaining Newton’s three laws.
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