History & Definitions
branch of physics that addresses the effects of forces on matter
mechanics
Newton's first law is known as the law of what?
inertia
type of friction that affects objects that are already sliding
kinetic
A change in velocity
acceleration
the fixed pivot point of a lever
fulcrum
study of motion and forces
dynamics
Force =
mass x acceleration
Friction is a force that _________ motion
resists/opposes
a quantity with magnitude but no direction
scalar
how much assistance a machine provides
mechanical advantage
whose teachings dominated scientific thought
Aristotle
For every action, there is an equal and ______________ reaction.
opposite
type of friction that affects rolling objects
rolling
has magnitude and direction
vector
a device used to multiply force or change how a force is applied
machine
discovered the laws of motion and gravitation
Newton
An object at rest tends to remain at _______
rest
type of friction that acts on objects that are not moving
static
how quickly or fast an object moves
speed
how well a machine converts input work into useful output work
efficiency
branches of physics before 1900s
classical
an object in motion tends to remain in ________
motion
what friction is the amount of friction between two surfaces
coefficient of friction
speed + direction
velocity
no real machine 100% efficient because of what?
friction