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53 Cards in this Set
- Front
- Back
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what are the three fundamental dimensions?
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length mass time
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___ is the amount of material in an object
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mass
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___ is the distance b/w two points
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length
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___ is the duration b/w two instants
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time
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Examples of derived measurements?
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Area, volume, density, velocity, acceleration
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____ is defined as a quantity that as a magnitute only.
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Scalar
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Scalor examples
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time speed temp volume
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____ is defined as a quantity that has both magnitude and direction.
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vector
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when two or more vectors are added they yield the sum or _____ vector
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resultant
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_______ are added to determine the resultant vector
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component vectors
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Newtons first law
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and object remains at resst or moves in a straight line with constant velocity if the net force on it is zero
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Newtons second law
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the acceleration of a body is proportional to the net force acting on it and in the direction of that net force
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Newtons third law
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if a body exerts a force on a second body, the second body exerts an equal and opposite force on the first. AKA for every action there is an equal and opposite reaction.
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Newtons law of universal gravitation
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each and every mass in the universe exerts a mutual, attractive gravitational force on every other mass in the universe. For any two masses the force is directly proportional to the product of the two masses and is inversly proportional to the square of the distance b/w them
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______ is the measure of the motion of a moving body. Result of the product of the bodys mass and velocity. P= mv
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Momentum
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explain conservation of momentum
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if no net external force acts on an object, the momentum of the object remains constant
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_______ is defined as a vector quantity that tends to produce acceleration of a body in the direction of its application.
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Force
F=ma |
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_____ is a special application of the concept of force. It is defined as the force exerted on an object by the gravitational field of the earth.
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Weight
W= (mg)/(32.17) 32.17=g sub c |
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What shows an isolated body with the representation of all external forces acting on it?
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Free body diagram
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Standard units of measurements associated with teh American Engineering system
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foot, pound mass, second
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Standard units of measurement associated with System International
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meter, kilogram, second
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define POWER
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work done per unit time
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____ is the force produced by two or more forces acting together
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reultant force
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A vector has both ____ and ____
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magnitude and direction
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KE=
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(mv^2) / 2gsubc
Kinetic energy |
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W =
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W=Fd
Work |
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Hp=
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Hp= Fv/550
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PE=
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PE =(mgz)/gsubc
potential energy |
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___ is define as a vector quantity that tends to produce an accleration of a body in the direction of its application
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Force
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Force =
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Force = Mass X Acceleration
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_____ is a special application of the concept of force. It is defined as the force exerted on an object by the gravitational field of the earth, or more specifically the pull of the earth on the body.
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weight
weight = (mg) / g sub c |
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the force which results from all theforces acting on a body is defined as _____
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Net Force
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An object in ____ is considered to be in a state of balance, it can be surmised that the net force on the object is equal to ZERO
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Equilibrium
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Equilibrium has a net force equal to ____
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ZERO
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If an applied force on a member tends to pull the member apart, it is said to be in ____
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Tension
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If a force tends to compress the member, it is in _____
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compression
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____ is the force resulting from two surfaces in contact, where one of the surfaces is attempting to move parallel to or over the other surface.
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Friction
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Two types of friction are what?
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fluid and dry (aka Coulomb)
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_____ forces are those frictional forces present when an object is stationary.
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Static-frictional
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_____ forces are those frictional forces present when two objects are moving
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Kinetic-frictional
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The magnitude of the frictional force is affected by what?
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weight of the object being moved
type of surface on the object being moved type of surface on which the object is moving |
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This force appears to be a force directed away from the center of the circular path / is a fictitious force, apparent outward force
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Centrifugal Force
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net force acting towards the center of a circular rotation, without this force the object will move in a straight line
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Centripetal force
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____ is defined as the measure of the ability to do work.
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energy
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___ determines the capacity of a system to perform work and may be stored in various forms
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energy
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____ is defined as the energy stored in an object because of its position
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Potential
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_____ is defined as the energy stored in an object because of its motion
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kinetic
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The ____ of an object represents the amount of energy required to increase the velocity of the object from rest to its final velocity,or the work it can do as it pushes against something in slowing down (waterwheel or turbine for example)
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kinetic energy
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___ is done by a force acting on a moving object if the object has some component of motion in the direction of the force
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Work
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____ work can be done on an object by applying a force that causes it to move.
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Work
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What is the First law of Thermodynamics (conservation of energy)
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energy cannot be created or destroyed, only altered in form
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____ is defined as the amount of energy used per unit time or rate of doing work.
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Power
units include watt, btu , Hp or ft-lbf/sec |
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P=
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p= (Fd) / t
Power |
