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Friction
________: a type of force that opposes the sliding of two surfaces touching each other.
Inertia
________: The tendency of an object to resist a change in its motion.
Gravity
________: an attractive force between two objects.
same direction
An object's momentum is in the ________ as its velocity.
Sir Issac Newton
________ developed the law of universal gravitation which states all objects are attracted to each other by a gravitational force.
Weight
________ is the gravitational force exerted on an object; because ________ is force it is measured in newtons.
Mass
________: matter in an object.
Velocity
________ is speed in a certain direction.
Elastic collision
________: when colliding objects bounce off each other.
contact force
A(n) ________ is a push or pull on one object by another that is touching it.
Inelastic collision
________: when objects collide and stick together.
Momentum
________ is a measure of how hard it is to stop a moving object.
net force
An object will accelerate in the direction of the (unbalanced) ________.
opposite direction
When an object applies a force on another object, the second object applies a force of the same strength on the first object, but the force is in the ________.
Arrows
________ can be used to show forces.
Newtons second law of motion
According to ________, the acceleration of an object is equal to the net force acting on the object divided by the objects mass.
Friction
________ and inertia cause objects to stop moving.
Gravity
________ is an attractive force that exists between all objects that have mass (the amount of matter in an object, measured in kilograms .)
net force
When unbalanced forces act on an object at rest, the object begins moving in the direction of the ________.
Friction
________ is a force that resists the motion of two surfaces that are touching.
net force
The combination of all forces acting on an object is the ________.
Chapter 2 study guide
The laws of motion
Force
a push or pull
Contact force
a force that one object exerts on on another object while touching it
Noncontact force
a force one object can exert on another without touching it
Gravity
an attractive force between two objects
Mass
matter in an object
Weight
the gravitational force exerted on an object
Friction
a type of force that opposes the sliding of two surfaces touching each other
Net force
the sum of all forces working on one object
Balanced force
when the net force acting on an object does not cause a change in its motion
Unbalanced force
when the net force acting on an object causes the motion of an object to change
Newton's 1st law of motion
an object will move at a constant velocity until unbalanced force acts on it
Inertia
The tendency of an object to resist a change in its motion
Newton's 2nd law of motion
f=ma force = mass x acceleration
Circular motion
any motion in which an object moves in a curved path
Centripetal force
a force that is exerted toward the center of a curved path
Newton's 3rd law of motion
if one object exerts a force on another the second object exerts an equal yet opposite force on the first object
Force pair
force two objects apply to each other
Momentum
a measure of how hard it is to stop an moving object
Law of conservation of Momentum
the total momentum of a group of objects stays the same unless outside forces act on the objects
Newton's second law equation
Force (Newtons) = Mass (kg) * Acceleration (m/s2)
Elastic collision
when colliding objects bounce off each other
Inelastic collision
when objects collide and stick together
Note 
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