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What is Inertia?
The tendency for motion to remain unchanged; until acted on by a resultant force, objects at rest remain at rest and objects moving at a constant velocity will continue to move that velocity (N1stLaw), this tendency to keep moving with the same velocity is called inertia.
What does an object’s inertial mass measure?
How difficult it is to change the velocity of an object
How can inertial mass be found?
Using Newton’s Second Law of F=m x a, rearranging this gives m = F/a, inertial mass is the ratio of force over acceleration
What is Newton’s Third Law of Motion?
When two objects interact, the forces they exert on each other are equal (referring to magnitude) and opposite (referring to direction) e.g. if you push something (like a trolley), it will push back against you, just as hard and as soon as you stop pushing, so does the trolley
What is the force that an object exerts called
The normal contact force
What has an effect on which object moves when two objects interact?
The mass of the objects, the object with the lower mass is more likely to move. If you (pushing the object) have a lower mass than the object (being pushed), then the object won’t move at all, and you will be pushed backwards
What is needed for an object to accelerate and move?
Either a high force or a small mass
