Dynamics and Kinematics

question

Force formula
answer

F = ma
question

dynamics
answer

the description of *what* causes things to move
question

kinematics
answer

the description of *how* things move; measures the positions, speed or velocity, and acceleration of objects
question

vector
answer

a measurable quantity that has both a scalar value *and* a direction associated with it
question

scalar
answer

any measurable quantity that can be completely described with a single piece of information; can be positive, negative, or zero
question

displacement
answer

change in position that involves a distance *and* a direction
question

distance
answer

a positive scalar quantity; no direction associated with it
question

speed
answer

the rate of motion; scalar quantity
question

rate
answer

compares the change in the value of a quantity to a certain span of time
question

speed formula
answer

V = d/Δt
question

average speed
answer

total distance divided by the total time
question

velocity
answer

rate of displacement; vector quantity
question

acceleration
answer

rate of change of the speed or velocity during a given time interval
question

acceleration formula
answer

a = Δv/Δt
question

force
answer

a push or a pull on a system
question

force vector
answer

*F*
question

unit of force
answer

newton (N)
question

newton
answer

1 kg*m/s2
question

contact forces
answer

act only when one system touches another; caused by the attraction or repulsion of atom-sized particles; a.k.a. mechanical forces
question

field force
answer

acts between the objects that are not touching; matter is not needed to transmit them; \”action-at-a-distance\” force
question

weight
answer

the gravitational attraction exerted on an object’s mass by the earth
question

proportionality constant
answer

9.81 N/kg
question

inertia
answer

the property of a body by which it remains at rest or continues moving in a straight line unless acted upon by a directional force
question

Law of Inertia/Newton’s First Law
answer

An object will not move by itself and that, once in motion, it won’t stop unless some force acts upon it
question

Law of Accelerated Motion/Newton’s Second Law
answer

When you push an object with more force, it will move faster and farther away.
question

Law of Action-Reaction/Newton’s Third Law
answer

For every action, there is an equal but opposite reaction.
question

normal
answer

\”perpendicular to\”
question

friction
answer

a contact force that opposes the movement of objects past each other
question

gravity
answer

a basic property of all matter; depends on the masses of the two objects and the distance between their centers
question

law of universal gravitation
answer

Simply: if you double one of the masses, you double the gravitational force
question

air resistance
answer

friction on an object moving through the air
question

free fall
answer

objects that fall due to gravity alone (no other forces are acting upon it whatsoever)
question

gravitational acceleration
answer

9.81 m/s2
question

weight formula
answer

w = mg
question

terminal velocity
answer

the constant velocity of an object’s fall
question

momentum
answer

a property that determines how much force is required to change their motion; vector quantity; has magnitude and direction
question

momentum formula
answer

*p* = m*v*
question

linear momentum
answer

momentum of a system moving in a straight path
question

angular momentum
answer

momentum of a rotating object; depends on the mass of the system, how fast it is rotating, and the distance of its mass from the axis of rotation
question

impulsive forces
answer

considered to act during short periods of time and being much larger than the other forces acting on a system
question

conservation of momentum
answer

Momentum of a system remains constant when there are no net external forces acting on it.
question

law of universal gravitation formula
answer

Fg = G Mm/r2

Get instant access to
all materials

Become a Member