Forces
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| founder of modern physics | isaac newton
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| a push or pull | force
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| anything that can change the motion of a body | force
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| newton is the unit for | force
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| if a body begins to move | a force has acted
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| if a body slows down | a force has acted
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| if a body changes direction | a force has acted
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| to find the total force when two forces are acting in the same direction | add the forces
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| to find the total force when two forces are acting in the oppoite direction | subtract the smaller force from the larger force
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| forces that are in opposite direction and equal in size are called | balanced forces
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| can not change the motion of a body | balanced forces
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| can change the motion of a body | unbalanced forces
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| the force that opposes the motion of a body | friction
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| type of surface | one factor determing amount of friction
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| weight of body on a surface | one factor determing amount of friction
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| friction produced by objects such as wheels or ball bearings is called | rolling friction
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| friction produced by objects moving across each other is called | sliding friction
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| friction produced by an object moving through the air or through water is called | fluid friction
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| the tendency of objects to remain in motion or stay at rest | inertia
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| an object at rest will remain at rest and an object in motion will remain in motion at constant velocity unless acted upon by an unbalanced force | newton's first law of motion
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| an object moving in a straight line will continue moving in a straight line because of | inertia
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| an unbalanced force acting on a body will cause it to | accelerate
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| the greater the force acting upon a body, the _____ the acceleration | larger
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| under a given force, the greater the mass of an object, the _______ the acceleration | smaller
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| unit for acceleration | m/s^2 (meters per second squared)
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| for every action, there is an equal and opposite reaction | newton's third law of motion
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| all objects in the universe attract all other objects | newton's law of universal gravitation
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| the greater the distance between two bodies, the ______ the attraction between them | smaller
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| the greater the mass of two object, the ______ the attractive force between them | greater
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| rate of acceleration of gravity on earth | 9.8 m/s^2 (meters per second squared)
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| when a falling body no longer accelerates, it has reached its | terminal velocity
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| when the force of gravity and the air resistance are equal | termingal velocity will occur
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| a measure of the force of gravity on an object | weight
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| amount of matter in a body | mass
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| increasing the mass of a body causes the weight to ______ | increase
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| increasing the acceleration of gravity, causes the body's weight to _____ | increase
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| the weight of a body can change, but the mass is _________ | constant
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| the formula for calculating weight is | w = mg
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| _______ is constant; _______ can change | mass, weight
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| force is | a push; a pull; the ability to change motion
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| forces that are opposite and equal are called | balanced
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| the force that opposes motion of an object is called | friction
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| the type of friction that exists for a shark swimming in the ocean is | fluid
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| the property of matter that resists a change in motion is | inertia
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| according to newton's second law of motion, force equals | mass X acceleration
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| the force of attraction that exists etween all objects in the universe is | gravity
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| a change in the force of gravity pullin on you will change your | weight
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| "slippery"substances such as oil, wax, and greases that reduce friction are called | lubricants
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| in a vacuum, a heavier object will fall to earth _______ than a lighter object | faster than
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