Physics Definitions And Formulas

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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