Physics 1 Flashcards
Newton’s first law states:
Law of inertia. An object in motion tends to remain in motion. An object at rest tends to remain at rest unless acted upon by an outside force
push or pull
Force
gravitational, electrical, magnetic, muscular are all different types of _____.
Force
Units of force (2):
Pounds and Newtons
When more than a single force acts on an object
Net force
a quantity such as force that has both magnitude and direction
Vector quantity
When the net force on something is zero.
∑F = 0
Mechanical equilibrium
vector sum of all forces = 0
The upward force opposite to the force of gravity
Support Force (normal force)
an object moving at a constant speed in a straight-line path is also in equilibrium.
Dynamic equilibrium
state of no change (requires 2 or more forces)
equilibrium
simplest form of motion. motion along a straight-line path.
Linear motion
speed at any instant in time
instantaneous speed
total distance covered/time interval =
Average speed
distance covered per unit of time
speed
distance/time =
speed
description of how fast AND in what direction an object is moving
Velocity
motion in a straight line at a constant speed
constant velocity
either the speed or the direction (or both) change
changing velocity
how quickly velocity changes
Acceleration
Acceleration = change in velocity/time interval
What acceleration IS
When direction doesn’t change, _______ may be expressed as the rate at which speed changes
acceleration
When a falling object is free of all restraints and falls under the influence of gravity alone
Free fall
V = acceleration x time
instantaneous velocity
how fast
distance traveled = 1/2 (acceleration x time x time)
Distance traveled by a uniformly acceleration object starting from rest
(how far)
Acceleration ~ net force/mass
Acceleration is directly proportional to net force and inversely proportional to mass
a force produced when surfaces are sliding over one another
Friction
_____ does not depend on area of contact.
Friction
Friction also occurs in _____ .
fluids
quantity of matter in an object
mass
force upon an object due to gravity
weight
when acceleration terminates.
Terminal speed
a = (mg – R)/m
acceleration is equal to (weight - air resistance)/mass.
To every action there is always an opposed equal reaction.
Newton’s 3rd Law
the upward reaction force caused when air particles are forced down (action) and the air forces the object up (reaction)
Lift
a quantity that can be described by magnitude only
Scalar quantity
an “arrow” that represents a vector quantity
Vector
The sum of two or more vectors
resultant
Construct a parallelogram wherein the two vectors are adjacent sides. The diagonal will show the resultant
Parallelogram Rule
