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what is inertia?
the tendency of an object to stay at rest or continue in uniform motion
what sort of objects have high inertia?
high mass (e.g. bowling ball, wrecking ball)
hard to move/stop moving (trolley)
what is Newton’s first law?
if the resultant force is 0, the object stays at rest if it is stationary, or keeps moving at a constant speed in the same direction (inertia)
how do the forces interact when the object moves at a constant velocity?
the resistive forces (air resistance and friction) and the driving (motive) force are balanced
when will the velocity (speed/direction) of a vehicle change?
if the forces are no longer balanced
what is velocity?
travelling at a constant speed in the same direction
how does a space probe travel and why?
at a constant velocity: there are no forces at all on it (no air resistance or gravity)
how does applying brakes effect the car?
friction is increased to give a resultant force and decelerates the car
how does a car’s direction change?
the sideways friction between the tyres and track provides a result force
what is inertial mass?
the measure of how difficult it is to change the velocity of an object
the ratio of force over acceleration
