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Physics
The study of physical forces and qualities: the scientific
study of matter, energy, force, and motion, and the way
they relate to each other
The study of matter, motion, energy and forces.
Displacement
• The difference between the initial position and the final
position of an object that has moved.
• Object that has moved from its original place to somewhere
else.
Motion
• Changing your location or position.
• The process of changing places.
Speed
• The distance an object moves in a unit of time.
• How far something travels over a certain amount of time.
Constant Speed
• When an object moves the same distance over a given unit of
time, it is said to have a constant speed.
• When an object moves from place to place at the same speed.
Changing Speed
• When the distance an object covers increases or decreases
over a given unit of time.
• The distance an object can travel in an amount of time either
increases or decreases.
Average Speed
• You calculate the average speed by dividing the total distance
by the total time.
• The most common speed hit over a period of time.
Velocity
• The speed and direction of a moving object.
• How fast an object travels and the direction that it moves.
Constant Velocity
• An object moves with constant speed and its direction does
not change.
• An object maintains a constant speed without changing its
direction.
Changing Velocity
• The velocity changes when an object’s speed or direction
changes.
• When velocity is altered.
Acceleration
• A measure in the change of velocity in a period of time.
• Measure of how quickly the speed and/or direction of an
object changes.
Force
• To pull or push an object.
• Pushing or pulling on something.
Contact Force
• A push or a pull on one object by another object that is
touching it.
• A push or pull motion on one item by another touching it.
• Friction is the most common contact force.
Noncontact Force
• A force that one object applies to another object without
touching.
• To add pressure to an object without touching it.
• Gravity and magnets produce noncontact forces.
Gravity
• An attractive force that exists between all objects that have
mass.
• A force that keeps us on the ground. (noncontact)
Friction
• Force that resists the sliding motion of two surfaces that are
touching.
• When two surfaces rub together, they resist sliding motion.
• Contact force
Balanced Forces
• Forces acting on an object that combine and form a net force
of zero.
• When forces push and pull on an object equally.
Unbalanced Forces
• Forces acting on an object that combine and form a net (total)
force that is not zero.
• Pushing on different parts of an object causing movement.
Newton’s First Law of Motion
• Law of Inertia
• Forces acting on an object is zero, the motion of an object does
not change.
8th Grades Terms
Inertia-An object will continue to do what it is doing.
An object in motion will remain in motion until another force acts
upon it.
Newton’s Second Law of
Motion
• Law of Acceleration
• Acceleration = Force divided by mass
• 8th grade terms
• An object’s motion will change in the direction of and
proportional to the force acting upon it.
Newton’s Third Law of Motion
• The Law of Reaction
• For every action there is an equal and opposite reaction.