# Force and Newton's Laws

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a push or a pull

### net force

the combination of all the forces acting on an object

### balanced forces

two or more forces exerted on an object cancel each other out and do not change the object's velocity

### unbalanced forces

two or more forces exerted on an object do not cancel each other out so the objects velocity changes

### Newton's first law of motion

if the net force on an object is zero, the object at rest stays at rest, while the object in motion stays in motion

### friction

the force that brings nearly everything to a stop

### Newton's second law of motion

the acceleration of an object equals the net force divided by the mass and is in the direction of the net force

### weight

the size of the gravitational force exerted on an object

### center of mass

the point in an object that moves as if all the object's mass were concentrated at that point

### Newton's third law of motion

forces always act in equal but opposite pairs

### static friction

a force that prevents an object from moving

### sliding friction

a force that opposes the motion that occurs when one solid surface slides over another

### rolling friction

a force that opposes the motion that occurs when an object rolls over a surface

### gravity

a force of attraction between objects that is due to their masses

### air resistance

a force that opposes the motion of objects that move through the air

### acceleration

the rate at which velocity changes

### mass

the amount of matter in an object

### velocity

the speed and direction of an object

### centripetal force

a force that causes an object to move in a circular path

accelerate

Friction

static

sliding

wheel

strength

### The speed an object reaches when the force of gravity is balanced by the fore of air resistance is called ____________________.

terminal velocity

inertia

Static

### A force can ____________

either push or pull

friction`

net force

motion

third

slow down

balanced

### Why is it easy to miss an action reaction pair?

It is easy to miss an action reaction pair because one of the objects is often more massive and appears to be motionless

### Why does friction never speed up an object?

If 2 objects are in contact, frictional forces always try to prevent one object from sliding on the other.

pause

size/inertia

### Action reaction forces are always the same _________ but are in opposite ___________

force...directions

### The ______________ is reached when the force of gravity; the size of the air resistance depends on the shape of an object and its speed

terminal velocity

unbalanced

### Galileo realized that an object could be in motion if the ________ acting on it were _____________. In real life, _____________ is the force that ________ _____objects down and causes them to ________. Newton's _________ law of motion described how forces cause the motion of objects to _________: An object at rest remains at rest and an object in motion continues to move in a ___________ line with constant _________if the net force action on it is _____.

force...balance...friction...slows...stop...first...change...straight...speed...zero

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