Newtons First Law
Motion
what is a change in position over time
If you push a swing with 5 units of force and then push it with 10 units of force, the second push will make it speed up by this many times
What is double
Newtons Third Law is famous for saying that for every action there is an equal and opposite _______
what is a reaction
When the net force acting on an object is exactly this number the forces are considered balanced
What is zero
This specific type of force opposes motion when two surfaces slide past each other
What is friction
This property determines how much inertia an object has
What is mass
If you want an object to speed up faster you need to use more of this
what is force
Newtons Third Law states that forces always come in these
what are pairs
An object moving at a constant speed in a straight line has this type of net force acting on it
What is a balanced force
friction always pushes in this direction
what is opposite
The tendency of an object to resist any change in its motion
what is inertia
if you double the net force applied to an object while keeping its mass the same this will occur
what is acceleration
If you blow up a balloon and let it go without tying it the air rushes out the back while the balloon flies this way
what is opposite direction
an object stays at rest unless acted on by this
What is an unbalanced force
fluid friction when an object moves through Earth's atmosphere
what is air resistance
This changes based on gravity
What is weight
This formula represents Newtons second law
what is F=ma
when you stand on the ground your feet push down on Earth and Earth pushes back up on you with this exact amount of force.
What is equal
This standard metric unit is used to measure the strength or magnitude of a force
What is a Newton
this is created when two surfaces rub together
what is heat
acceleration is measured in these units
What is meters per second squared
In F = m × a the letter m stands for this
what is mass
The action force and the reaction force never cancel out because they always act on two different ______
what are objects
This is what happens to the motion of an object when it is acted upon by perfectly balanced forces
What is nothing
once an object is already in motion this type of friction acts against its movement as the surfaces slide against each other
what is kinetic friction