Force and Newton's Laws

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force

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

An object will________________ when the net force is zero.

accelerate

_________will never speed up an object.

Friction

the friction that prevents an object from moving when a force is applied is __________ friction

static

The friction that slows down an object that slides is ___________ friction

sliding

A(n)_________helps reduce sliding friction.

wheel

Normal force is supplied by the ________ of the surface

strength

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

terminal velocity

Earth has so much ____________ that it hardly accelerates when you push against it.

inertia

__________ friction keeps an object a rest.

Static

A force can ____________

either push or pull

The unbalanced force that stops almost anything is _________________

friction`

An object will accelerate in the direction of the _______________

net force

A net force acting on an object changes the object's __________

motion

Newton's__________ law of motion describes the connection between an object supplying force and the object receiving the force.

third

A force in the opposite direction to the motion of the object will cause the object to ____________

slow down

If an object is at rest, all forces acting on that object must be ____________

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.

There is no __________ in time between the action and the reaction

pause

One reason it's often easy to miss an action reaction pair is b/c of the _____________ of one of the objects

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

An object can speed up, slow down or turn in the direction of the net force when the __________ forces act on it.

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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