science 4 Flashcards
what is the definition of a force
Forces are a push or a pull or twist…in a particular direction
what is the definition of a unbalnced force
If the effects of the forces don’t cancel each other, they are unbalanced forces.
what is the definition of a balanced force
Two or more opposite forces are balanced forces if their effects cancel each other
what is the definition of air restisistance
oppositie force to gravity
what is the definition of gravity
Is a non-contact force,
It is a force that pulls and
Gives an object its weight
what is the definition of friction
Friction is a resistance against the movement of an object
what is the definition of magnetism
non contact force
what causes friction
friction is caused by the interactions between the tiny bumps on the surface
what is the definition of neutral buoyancy.
neutral boyancy is If the buoyancy equals the weight
whats mass
how much matter is inside u
whats weight
measure of the pull of gravity on ur mass
what are newtons
the international unit of measure for force.
what are simple machines
Simple machines are devices that make it easier to do work.
what order does the 1st class lever go in
efl
what order does the 2nd class go in
elf
what order does the 3rd class lever go in
fel
what is a fulcrum
The turning point of a lever
what is a lever
A lever is a simple machine that uses the turning effect of a force to make a task easier
what is a effort
The force required to cause movement
what is a load
The resistance to motion that a lever works against is the load
what is newtons first law
An object in motion will remain in motion, or an object at rest will remain at rest unless acted upon by an external unbalanced force
what is terminal velocity
Terminal velocity is steady speed achieved by an object freely falling through a liquid
what is inertia
inertia is the quality in matter that lets it stay still if it is still and keeps it moving if it is moving
what is sinking
Objects that sink push on a liquid.
what is boyancy
The liquid pushes back on the object.
what is static friction
There is friction between stationary objects
what is kinetic friction
There is friction between objects that move
what is unwanted friction
whenu dont want friction
what is useful friction?
is when u want friction
what is floating
If the buoyancy exceeds theweight, then the object floats
what is density
how muchmassa substance has
what is densitys formula
D = m/V or density = mass/ volume
what is Archimedes’ Principle
Thebuoyant forceon a submerged object is equal to theweightof the liquid displaced by the object
