Science - Physics (Mechanics) Flashcards
displacement
distance than an object is from some starting point
how is motion described?
displacement, velocity, acceleration
equation for speed
speed = distance traveled/time
velocity
speed in a given direction (speed and direction)
acceleration
the rate of change in velocity
deceleration
negative acceleration or decrease in velocity - can cause change in direction
acceleration equation
acceleration = final velocity - original velocity / time
what can be described using vectors
velocity and acceleration (they both have magnitude and direction)
equation for momentum
momentum = mass x velocity
what is the main law of classical physics that states that the total momentum of an isolated system is always constant
conservation of momentum
what is newton’s first law
law of inertia
object in motion stays in motion..rest
inertia
property of matter that resists any change in motion
what is newtons second law
force = mass x acceleration (f=ma)
The newton (N) unit
unit that represents a force that accelerates a mass of 1 kg, 1 m per second
force of attraction between all objects in the universe
gravity
density equation
density = mass/vol
Torque
perpendicular force times the lever arm
lever arm
distance from the axis of rotation to the point where the force is exerted
the farther the force from the axis of rotation,
the easier it is to rotate the object and the more torque is produced
newtons third law
for every action there is, there is an equal and opposite reaction
energy
ability to do work
kinetic energy
energy associated with motion
equation for kinetic energy
kinetic energy = 1/2 (mass x velocity)^2
potential energy
energy stored in a body because of position