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43 Cards in this Set
- Front
- Back
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friction
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The force that one surface exerts on another when the two surfaces rid against each other.
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static friction
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Friction that acts on objects that are not moving.
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sliding friction
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Friction that occurs when one solid surface slides over another.
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rolling friction
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Friction that occurs when an object rolls over a surface.
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fluid friction
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Friction that occurs as an object moves through a fluid.
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gravity
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The force that pulls objects toward each other.
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mass
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The amount of matter in an object.
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weight
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The force of gravity on an object at the surface of a planet.
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free fall
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The motion of a falling object when the only force acting on it is gravity.
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air resistance
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The fluid friction experienced by objects falling through the air.
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terminal velocity
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The greatest velocity a falling object can achieve.
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projectile
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An object that is thrown.
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Newton’s first law of motion
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every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. This is normally taken as the definition of inertia.
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inertia
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The tendency of an object to resist any change in its motion.
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Newton’s second law of motion
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The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
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Newton’s third law of motion
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For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object.
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momentum
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The product of an object’s mass and velocity.
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Law of conservation of momentum
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The rule that in the absence of outside forces the total momentum of objects that interact does not change.
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motion
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The state in which one object’s distance from another is changing.
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reference point
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A place or object used for comparison to determine if an object is in motion.
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meter
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The basic SI unit of length.
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speed
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The distance an object travels per unit of time.
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average speed
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The overall rate of speed at which an object moves; calculated by dividing the total distance an object travels by the total time.
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instantaneous speed
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The speed of an object at one instant of time.
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velocity
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Speed in a given direction.
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slope
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The steepness of a line on a graph, equal to it’s vertical change divided by its horizontal change.
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acceleration
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The rate at which velocity changes.
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force
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A push or pull exerted on an object. mass times acceleration
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newton (unit)
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A unit of measure that equals the force required to accelerate 1 kilogram of mass at 1 meter per second.
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net force
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The overall force on an object when all the individual forces acting on it are added together.
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unbalanced forces
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Forces that produce a nonzero net force, which changes an object’s motion.
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balanced forces
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Equal forces acting on an object in opposite directions.
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motion
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an object is in _____ when its distance from a reference point is changing.
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100
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centimeters in a meter
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1,000
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meters in a kilometer
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750mph
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speed of sound
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186,000 miles per second
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speed of light
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200mph
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speed of a race car
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15,000 miles per hour
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speed of a rifle bullet
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25,000 mph (7 miles per second)
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Speed of a rocket into orbit
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final velocity - initial velocity
______________________________ time |
Acceleration =
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distance
___________ time |
speed =
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mass x acceleration
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force
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