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Apply Newton’s First
Law to the following
illustration.
“The Law of Inertia”
An object at rest tends to stay at rest and
an object in motion tends to stay in
motion unless acted upon by an
unbalanced force.
The direction of the net force is in the same direction as the
acceleration. Thus, if the direction of the acceleration is known, then
the direction of the net force is also known. Consider the two oil drop
diagrams below for an acceleration of a car. From the diagram,
determine the direction of the net force that is acting upon the car.
Then click the buttons to view the answers.
1.1
To explain forces using Newton’s
three laws of motion.
Newton’s Second Law
Weight.
Every object in the universe with mass attracts every
other object with mass. The amount of attraction depends on the size
of the masses and how far apart they are. For everyday-sized objects,
this gravitational pull is vanishingly small, but the pull between a very
large object, like the Earth, and another object, like you, can be easily
measured. How? All you have to do is stand on a scale! Scales measure
the force of attraction between you and the Earth. Weight is a measure
of the force of attraction between you and the Earth (or any other
planet) is called your weight.
https://www.exploratorium.edu/ronh/weight/
What is the weight of a 75 kg
sack of flour on Earth?
What is the weight of a 75 kg
sack of flour on Earth?
75 kg
is the measure of the amount of
matter in an object. It is measured in
GRAMS (g).
Force is measured
in
“Newtons”
ACCELERATION of
GRAVITY
(Earth) = 9.8 m/s2
Weight (force) = mass x gravity
(Weight is a measure of the pull of gravity on an object .
One rock weighs 10 kg.
The other rock weighs 5 kg.
How much more force will be
required to accelerate the first
Rock at the same rate as the
second rock?