Jessica Mai 12/5/14 4B
Newton’s 1st Law of Motion
An object in motion stays in motion (constant speed) unless acted on by another force.
Force - (N) newton, forces may be balanced or unbalanced.
Inertia - an object’s ability to resist motion
(depends on mass), a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.
A book is on a table and it will not move unless somebody exerts force on it externally.
This force has to be unbalanced (opposite force) if applied at same time, will not make the book move.
Examples of Newton’s 1st Law of Motion
The head of a hammer can be tightened onto the wooden handle by banging the bottom of the handle against a hard surface.
If you are stopped at a stop light on a level road, you need to step on the gas pedal when the light turns green to be able to go forward. Newton’s 2nd Law of Motion
If the same force is applied to an object with greater mass, the object accelerates at a slower rate because mass adds inertia.
Objects with more mass(kg) need more force (N) to accelerate. Formula for Newton’s 2nd Law of Motion
FORCE = MASS times ACCELERATION
Pushing a 10 lb ball as hard as you can, then pushing a 5 lb ball as hard as you can.
The 10 lb ball would accelerate less than the 5lb ball because the 10 lb ball has more mass.
Mike's car weighs 1,000 kg and is out of gas. Mike is trying to push the car to a gas station and he makes the car go 0.05 m/s/s. Using Newton's Second Law,…