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Published byNorman Ramsey Modified over 9 years ago
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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.
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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.
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Motion Changing your location or position. The process of changing places.
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Speed The distance an object moves in a unit of time. How far something travels over a certain amount of time.
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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.
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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.
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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.
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Velocity The speed and direction of a moving object. How fast an object travels and the direction that it moves.
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Constant Velocity An object moves with constant speed and its direction does not change. An object maintains a constant speed without changing its direction.
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Changing Velocity The velocity changes when an object’s speed or direction changes. When velocity is altered.
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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.
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Force To pull or push an object. Pushing or pulling on something.
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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.
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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.
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Gravity An attractive force that exists between all objects that have mass. A force that keeps us on the ground. (noncontact)
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Friction Force that resists the sliding motion of two surfaces that are touching. When two surfaces rub together, they resist sliding motion. Contact force
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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.
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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.
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Newton’s First Law of Motion Law of Inertia Forces acting on an object is zero, the motion of an object does not change. 8 th 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.
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Newton’s Second Law of Motion Law of Acceleration Acceleration = Force divided by mass 8 th grade terms An object’s motion will change in the direction of and proportional to the force acting upon it.
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Newton’s Third Law of Motion The Law of Reaction For every action there is an equal and opposite reaction.
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