newton's laws of motion Flashcards
Push or pull that changes an object’s motion
force
Force that resists surfaces when one attempts to slide against the other; creating heat
friction
the force that prevents relative motion between two contacting surfaces when they are at rest
static friction
——- friction occurs when two surfaces rub together
sliding/kinetic friction
What can be done to reduce friction?
Lubrication
A force that attracts objects towards each other
gravity
Why can an object’s weight change while its mass is always constant?
Weight changes depending on how much gravity is put onto the object and an example would be your weight on the moon VS earth.
Newton’s first law
An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.
Tendency of a motion to resist changes in motion
Inertia
Newton’s second law
Newton’s second law states heavier objects take more force to move
Do smaller or larger objects contain more inertia?
Larger because an object’s mass is equivalent to it’s inertia.
Rate at which an object’s speed increases
acceleration
Newton’s third law
every action has an opposite and equal reaction; reaction will reciprocate back
An astronaut is sent with a backpack of tools out of a spacecraft to fix a satellite. She forgets to connect her tether to the ship. How can she use Newton’s third law to bring her back to the ship?
By creating an action that will exert on herself, sending her backwards.
The amount of motion in an object
momentum
energy cannot be created or destroyed, but it can change forms
law of conservation of energy
in an isolated system the total momentum of two or more bodies acting upon each other remains constant unless an external force is applied.
law of conservation of momentum
energy that’s stored in an object due to its position, shape, or arrangement
potential
a form of energy that an object or a particle has by reason of its motion.
kinetic energy
what increases kinetic energy?
work
both energies; the energy of an object due to its motion or position.
mechanical
