first term of use Flashcards
what is weight
the force that pulls us down
what is air resistance
acts against anything moving through air
what is friction
friction keeps things still
what is a force
a push or a pull
what is upthrust
it keeps things floating
what is the difference between mass and weight?
mass is how much of something and weight is mass times gravitational field.
what moves faster a curved shape with a pointed back or a ball?
a curved shape with a pointed back.
what makes objects float?
when the water resistance is equal to (or more than) the weight.
what makes objects sink
when the weight is more than the water resistance
what is density
the mass of an object divided by the volume.
what is a description of the speed equation
speed=distance over time
do arrows point at the subject in a force diagram or away from?
away from (they have to touch)
what happens when two equal and opposite forces are both affecting the same object
it is not changing speed (unless there are more forces)
what is newtons third law
every action has an equal and opposite reaction
how can you measure the density of an object
by dropping it in water and measuring the amount of water displaced.
