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Science Test

Chapter 12

TermDefinition
force a force can cause a resting object to move, or it can accelerate a moving object changing the object's speed or direction.
newton the force that causes a 1-kilogram mass to accelerate at a rate of 1 meter per second.
net force the overall force acting on an object after all the forces are combined.
friction a force that opposes the motion of objects that touch as they move past each other.
static friction the friction force that acts on objects that are not moving.
sliding friction a force that opposes the direction of motion of an object as it slides over a surface.
rolling friction the friction force that acts on rolling objects.
fluid friction it opposes the motion of an object through a fluid.
air resistance fluid friction acting on an object moving through the air.
gravity a force that acts between any two masses.
terminal velocity the constant velocity of a falling object when the force of air resistance equals the force of gravity.
projectile motion the motion of a falling object after it is given an initial forward velocity.
inertia the tendency of an object to resist a change in its motion.
mass a measure of the inertia of an object and depends on the amount of matter the object contains.
weight the force of gravity acting on an object.
momentum the product of an object's mass and its velocity.
law of conservation of momentum if no net force acts on a system, then the total momentum of the system does not change.
electromagnetic force it is associated with charged particles.
strong nuclear force a powerful force of attraction that acts only on the neutrons and protons in the nucleus, holding them together.
weak nuclear force an attractive force that acts only over a short range.
gravitational force an attractive force that acts between any two masses.
centripetal force a center-directed force that continuously changes the direction of an object to make it move around the center.
Created by: lizzyhearts432
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