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26 Cards in this Set
- Front
- Back
vector quantity
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a quantity that has both size and direction, as force does
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scalar quantity
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a quantity that has size only
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force
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is that which can impose a change in velocity on a material body
F=ma |
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work
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the amount of energy transferred by a force acting through a distance
W=energy W=Fd |
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power
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the rate at which work is performed or energy is converted
P=W/t |
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joule
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standard metric unit of measurement for kinetic energy
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watt
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unit of power
1 watt = 1J/1s |
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kinetic energy
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is the energy of motion
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potential energy
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is the stored energy of position possessed by an object
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friction
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the rubbing of two objects against each other when one or both are moving
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kinematics
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is the branch of classical mechanics or mechanical engineering that describes the motion of bodies (objects) and systems (groups of objects) without consideration of the forces that cause the motion
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newton's first law of motion
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a body remains at rest or, if already in motion, remains in uniform morion with constant speed in a straight line, unless it is acted on by an unbalance external force
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newton's second law of motion
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the acceleration produced by a particular force acting on a body is directly proportional to the magnitude of the force and inversely proportional to the mass of the body
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mechanical energy
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describes the sum of potential energy and kinetic energy present in the components of a mechanical system. Mechanical energy is the energy associated with the motion or position of an object
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inertia
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the name for the tendency of an object in motion to remain in motion, or an object at rest to remain at rest, unless acted upon by a force
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acceleration
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the rate at which something increases in velocity
acceleration=slope acc. of objects due to g= 9.81m/s² |
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velocity
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distance covered in unit time (m/s)
V=d/t |
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displacement
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a vector or the magnitude of a vector from the initial position to a subsequent position assumed by a body
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static
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still
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dynamic
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moving
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free-body diagram
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is a pictorial representation often used to analyze the forces acting on a free body
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newtons
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the newton is the unit of force (N)
1 N= 1 kg ∙ m/s² |
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formulas
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a simplified statement, generally using numerals and other symbols, expressing the constituents of a chemical compound, a method for preparing a substance, or a procedure for achieving a desired value or result
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weight
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the force that results from the acceleration by gravity on the mass of an object
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mass
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mass is the quantity of inertia possessed by an object or the proportion between force and acceleration
kg |
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adding vectors
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when you connect the head of one vector to the tail of the other
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