Force and Motion 2017
Terms in this set (26)
a change in position relative to a reference point
the point of reference used to describe an object's motion; typically, an object that appears to stay in place
push or pull exerted on an object; measured in newtons; may or may not cause motion!!
combination of all forces acting on an object; direction and magnitude must be considered to calculate this
a force that always acts to oppose motion
friction that exists between a stationary object and the surface on which it is resting; does not appear unless a force is acting on the object in the opposite direction (unit = newton)
friction between bodies in motion with respect to each other (unit = newton)
amount of matter in an object - does not change when location changes. A measure of an objects inertia.
the gravitational pull on an object. (unit = newton)
a force of attraction between objects that is due to their masses and the distance between the objects. (unit = newton)
combined forces that do NOT cause a change in motion.
combined forces that cause a change in motion (aka "net force"
the distance traveled in a certain amount of time; distance divided by time.
speed in a given direction
change in velocity; any change in motion (speeding up, slowing down and/or changing direction); (final velocity - original velocity) divided by time.
law of universal gravitation
all objects in the universe have a gravitational pull on all other objects in the universe; all mass has gravity; depends on mass and distance
when the only vertical force acting on the object is gravity
when gravitational pull is equal to the force of air resistance; maximum speed of a falling object
a curved path an object follows when thrown near Earth's surface
an object moves forward and is in free fall
a force that keeps objects in motion
Newton's First Law of Motion
An object at rest remains at rest and an object in motion remains in motion unless acted upon by an unbalanced force.
Newton's Second Law of Motion
The acceleration of an object depends on the mass of object and amount of force applied; F = ma
Newton's Third Law of Motion
For every action force there is an equal and opposite reaction force; forces come in pairs!
If object A acts on object B, then object B acts on object A with a force that is equal in force and opposite in direction.
the tendency of an object to keep doing what its doing (if moving, keeps moving like it is; if sitting it, keeps sitting). The mass is equal to the inertia of the object.
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