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28 Cards in this Set
 Front
 Back
force

force
a push or a pull 

net force

net force
the overall force on an object after all the forces are added together. 

unbalanced forces

unbalanced forces
a nonzero net force that changes an object's motion. (can cause an object to start moving, stop moving, or change direction) 

balanced forces

balanced forces
equal forces acting on one object in opposite directions 

inertia

inertia
the tendency of an object to resist change in its motion. 

mass

mass
the amount of matter in an object. 

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. 

friction

friction
the force that one surface exerts on another when the two rub against each other 

sliding friction

sliding friction
the kind of friction that occurs when solid surfaces slide over each other 

rolling friction

rolling friction
the kind of friction that occurs when an object rolls over a surface 

fluid friction

fluid friction
the kind of friction that occurs when an object moves through a fluid 

free fall

free fall
When the only force acting on a falling object is gravity (the object accelerates as it falls) 

projectile

projectile
an object that is thrown 

air resistance

air resistance
the fluid friction experienced by objects falling through air 

terminal velocity

terminal velocity
the maximum or greatest velocity a falling object achieves 

momentum

momentum
the product of its mass and its velocity (it is in the same direction as its velocity) 

law of conservation of momentum

law of conservation of momentum
the rule that the total momentum of objects in an interaction does not change 

satellite

satellite
any object that travels around another object in space 

centripetal force

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

What is the difference between
"balanced" and "unbalanced" forces? 
Balanced forces acting on an object will NOT change the object's motion.
Unbalanced forces acting on an object WILL change the object's motion. 

What is Newton's First Law of motion?

This law states that an object at rest will remain at rest and an object that is moving at constant velocity will continue moving at constant velocity unless acted upon by an unbalanced force.


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 Acceleration
Acceleration = Force divided by mass 

The strength of the force of friction depends on what two factors?

the types of surfaces involved
how hard the surfaces push together 

What is weight?

the force of gravity on a person or object at the surface of a planet.


What is the law of universal gravitation?

The law of universal gravitation states that the force of gravity acts between all objects in the universe. Any two objects in the universe, without exception, attract each other.


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.


To find weight how can one rewrite Newton's second law of motion?
Force = Mass x Acceleration 
Weight = Mass x Acceleration due to gravity


What is the formula for finding the momentum of an object?

Momentum = Mass x Velocity
