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Grade 5 Sci Ch 2

Lesson 1 and 2

TermDefinition
force a push or pull that acts on an object
contact force a force that requires two pieces of matter to touch
friction the force that results when two materials rub against each other
non-contact force a force that acts at a distance
gravity the force of attraction between any two objects
acceleration the rate at which the speed or direction of motion of an object changes over time
inertia the tendency of an object to resist any change in motion
newton a unit of force
air resistance friction when air particles contact a surface
gravity, electric forces, and magnetic forces types of non-contact force
weight the force of Earth's pull on an object
repel each other objects with the same magnetic charge
attract each other objects with the opposite magnetic charge
uniform motion motion without acceleration
Newton's First Law an object will stay in uniform motion unless a net force acts on the object
Newton's Second Law part 1 the greater the mass of an object, the smaller its change in motion
Newton's Second Law part 2 the greater the force applied, the greater the change in motion for a given mass
Newton's Third Law when one object exerts a force on a second object, the second force exerts a force on the first
Created by: laroi
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