8.1 Force and Acceleration Flashcards
what is newton’s first law of motion
objects either stay at rest or moves with constant velocity unless acted on by a force
what is needed to change an objects velocity
a resultant force
when an object is moving at a constant velocity there must be
no forces acting on it
forces acting on it are balanced so resultant force is zero
what is force proportional to
mass x acceleration
if there is a constant force acting on an object what else must be constant
constant acceleration
what is the equation for newtons second law for constant mass
f=ma
how do you find weight
mass x gravity
when an object is in equilibrium what is the support force on the object equal and opposite to
the weight of the object
what is gravitational field strength
the force of gravity per unit mass on a small object at that position
dependent on the object location e.g on the moon it is 1.62N
why is the mass of an object a measure of
its inertia (its resistance to the change of motion)
more force is needed to give an object acceleration than an object with a smaller mass the same acceleration
why does the coin flick into the glass
the force of the friction on it due to moving the card is too small to shift the coin sideways
