## Coach Francis Chapter 10 CPA

##### Created by:

MSgirl369  on May 9, 2010

##### Description:

Physical Science for Coach Francis 8th grade at CPA in Nashville CHAPTER 10!!! :)

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# Coach Francis Chapter 10 CPA

 forcepush or pull
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#### Definitions

force push or pull
newton the strength of a force is measured in the SI unit
net force the combination of all forces acting on an object
unbalanced forces can cause an object to start moving, stop moving, or changing direction
balanced forces equal forces acting on one object in opposite directions
balanced forces... acting on an object do not change the object's motion
unbalanced forces... acting on an object result in a net force and cause a change in the object's motion
friction the force that two surfaces exert on each other when they rub against each other
the strength of the force of friction depends on 2 factors: (1) How hard the surfaces push together and (2) The types of surfaces involved
static friction the friction that acts on objects that are not moving
sliding friction occurs when two solid surfaces slide over each other
rolling friction when an object rolls across a surface
fluid friction occurs when a solid object moves through a fluid
gravity a force that pulls objects toward each other
law of universal gravitation states that the force of gravity acts between all objects in the universe
two factors affect the gravitational attraction between objects: mass and distance
mass a measure of the amount of matter in an object
SI unit for mass the kilogram
weight the force of gravity on a person or object at the surface of a planet
free fall when the only force acting on an object is gravity
air resistance The fluid friction experienced by objects falling through the air
terminal velocity the greatest velocity a falling object reaches
projectile an object that is thrown
Newton's first law of motion states that an object at rest will remain at rest, and an object moving at a constant velocity will continue moving at a constant velocity, unless it is acted upon by an unbalanced force
inertia the tendency of an object to resist a change in motion
Newton's second law of motion states that acceleration depends on the objects mass and on the net force acting on the object
Newton's third law of motion 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
momentum a characteristic of a moving object that is related to the mass and the velocity of the object
momentum= mass*velocity
law of conservation of momentum states that in the absence of outside forces, the total momentum of objects remains the same, or is conserved, unless outside forces act on the objects
satellite any object that orbits another object in space
centripetal force (center seeking) any force that causes an object to move in a circular path
Satellites in orbit around the Earth continuously fall toward the Earth, but because Earth is curved they travel around it

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