Terms  Definitions 

centripetal force 
centripetal forceany force that causes an object to move in a circle(first word means "centerseeking"

What unbalanced force causes objects to accelerate towards the Earth's surface at a rate of 9.8 m/s2? 
... gravity.

air resistance 
opposes the motion of objects that move through the air

What is regular friction? 
When two objects rub together.

weight 
the amount or quantity of heaviness or mass; amount a thing weighs.

velocity 
the time rate of change of position of a body in a specified direction.

What is the net force of forces that are equal in magnitude (size) but opposite in direction acting on an object? 
... zero.

What are BALANCED FORCES? 
... forces that are EQUAL in magnitude (size) but OPPOSITE in direction.

newton ( N ) 
newton ( N )a unit of measure that equals the force required to accelerate one kilogram of mass at a rate of one meter per second per second.

What law of motion best explains why you should wear a seatbelt when driving to ensure your safety? 
Newton's first law of motion.

Do you still have weight when you float in water? 
Yes, but you do not feel it.

What is Newton's second law of motion? 
The net force on an object is the product of its mass and acceleration.

projectile 
projectilean object that is thrown

momentum 
the product of its mass and velocity

In which unit is force measured? 
Newtons (N)

acceleration 
the act of accelerating; increase of speed or velocity.

The amount of force required to accelerate a 1 kg mass at a rate of 1 m/s2 (meter per second squared)is a _________. 
... Newton

What is INERTIA? 
... the tendency of an object to resist a change in its motion.

Newtons second law of motion 
states that the acceleration of an object is in the same direction as the net force on the object, and that the acceleration can be calculated

As the distance between two objects increases, what happens to the size of the universal force of attraction due to gravity between them? 
The force of gravity decreases.

The net force on an object is equal to the product of its acceleration and its mass. How can the equation be written to show the relationship among the quantities force, mass and acceleration? (2 ways) 
Force = Mass x AccelerationAcceleration = Force divided by mass

What is Newton's third law of motion? 
It states that if one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction on the first object.

force 
a push or pull

newton is the unit for 
force

amount of matter in a body 
mass

_______ is constant; _______ can change 
mass, weight

unit for acceleration 
m/s^2 (meters per second squared)

terminal 
The greatest velocity a falling object reaches

satellites 
in an orbit around the Earth continuolsy fall toward Earth, but because Earth is curved they travel around it

the greater the mass of two object, the ______ the attractive force between them 
greater

the property of matter that resists a change in motion is 
inertia

increasing the mass of a body causes the weight to ______ 
increase

when a falling body no longer accelerates, it has reached its 
terminal velocity

anything that can change the motion of a body 
force

if a body changes direction 
a force has acted

the tendency of objects to remain in motion or stay at rest 
inertia

can change the motion of a body 
unbalanced forces

freefall 
When the force on an object is gravity

Gravity 
A force that pulls objects toward each other

friction 
The force that two surfaces exert on each other when they rub against each other

a measure of the force of gravity on an object 
weight

according to newton's second law of motion, force equals 
mass X acceleration

balanced forces 
Equal forces acting on one object in oppisite directions.

centripetal force 
Any force that causes on object to move in a circular path

Unbalanced Forces 
Whenever there is a net force acting on an object the forces are unbalnced. Motion occurs.

to find the total force when two forces are acting in the same direction 
add the forces

weight of body on a surface 
one factor determing amount of friction

for every action, there is an equal and opposite reaction 
newton's third law of motion

law of conservation of momentum 
in the absence of outside forces the total momentum of objects that interact does not change.

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