Newtons Law 1 Flashcards
WHAT DOES NEWTONS 1ST LAW STATE?
An object will not change its motion unless acted on by an external unbalanced force.
AN EXAMPLE OF NEWTONS 1ST LAW?
For example, a plant at rest (not moving) on a table will stay at rest until an external force moves it.
WHAT IS THE OTHER NAME FOR NEWTONS 1ST LAW?
the Law of Inertia
WHAT IS INERTIA?
Inertia is the tendency of an object to resist changes to its motion.
If the object is at rest, it ‘wants’ to stay at rest.
Likewise, if it is moving, it ‘wants’ to keep moving
WHAT IS AN EXAMPLE OF INERTIA?
When you are moving in a car and it brakes, the friction of the brakes stops the car, but does not stop you.
Your body keeps moving forward until stopped by your seatbelt.
HOW DOES MASS AFFECT INERTIA?
An object with a larger mass has more inertia than an object with a smaller mass.
EXAMPLE OF MASS AFFECTING INTERTIA?
A bowling ball has more inertia than a netball because it has more mass.
They are a similar size, but it takes more force to move the bowling ball than the netball because it has more mass.
It also takes more force to stop the bowling ball once it is moving than it would take to stop a netball moving at the same speed.
