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science test on 2/7

science test

QuestionAnswer
motion an objects change in position relative to a reference point
speed the distance traveled by an object divided by the time taken to travel the distance
velosity the speed of an object in a particular direction. must include reference direction*velosity changes if speed or direction changes*
acceleration the rate at which velocity changes. object accelerates if its speed direction or both change
forces a push or pull on an object. newtons (N)
net force the combination of all the forces acting on an object
balanced forces when the forces on an object produce a net force of 0n
unbalanced forces when the net force on an object is not 0n
friction a force that opposes motion between two surfaces that are in contact
greater the force = greater the friction
rougher the surface = greater the friction
kinetic friction = moving friction
what are two types of kinetic friction? sliding and rolling friction
static friction not moving friction
ways to reduce friction adding lubricants (oil or wax) switching from sliding to rolling friction making the surfaces smoother
ways to increase friction make the surface rougher or to increase force
gravity a force of attraction between objects that is due to their masses
all matter is affected by what? gravity, all objects experience an attraction towards other objects (depends on mass)
force must be applied to overcome what? to overcome gravitational force
newtons law of universal gravitation all objects in the universe attract each other through gravitational force, the size of force depends on the mass and the distance between the objects
part 1 gravitational force increases as mass increases
part 2 gravitational force decreases as distance increases
weight a measure of gravitational force on an object
mass the amount of matter in an object
Created by: maddybrz
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