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44 Cards in this Set
- Front
- Back
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when the objects collide the shapes are unchanged and they don't stick together
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elastic collision
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objects shape is deformed or stick together
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inelastic collision
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two types of collisions
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elastic and inelastic
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the inertia of a moving subject; variable is p
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momentum
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is mass times velocity and considered a vector
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momentum
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the total initial momentum of a system must be equaled to the total momentum of a system in its final state
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conservation of momentum
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forces exerted over a small period of time that results in a change in momentum
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impulse
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force times distance where both must be along the same axis
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work
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what do you normally work against when in the Y direction
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force of gravity
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work divided by time, unit is watt
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power
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equals one joule divided by second
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watt
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equals newton times and mass
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joule
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the ability to do work
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energy
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involves motion of objects and their potential to move
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mechanical energy
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two main types of mechanical energy
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potential and kinectic energy
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energy associated with motion
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kinectic energy
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stored energy
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potential energy
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two types of potential energy
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gravitational potential energy and elastic potential energy
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two scalar quantities
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energy and work
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what does a change in speed determine
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change in kinectic energy
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what happens whenever you do work on a system
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you change its energy
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sum of mechanical energy in initial state will equal the sum of mechanical energy in its final state
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conservation of mechanical energy
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energy cannot be created nor destroyed; it may be transformed from one form into another, but the total amount of energy never changes
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conservation of energy
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the work done on an object equals the change in kinectic energy of the object
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work- energy theorum
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the linear speed of something moving along a circular path
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tangential speed
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involves the number of rotations or revolutions per unit of time
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rotational speed
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when tangential speed undergoes change what occurs
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tangential acceleration
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the property of an object to resist changes in its rotational state of motion
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rotational inertia
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the product of force and lever-arm distance that are perpendicular to each other which tends to produce rotation
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torque
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what sign do you have when spin counter clockwise
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positive
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what sign do you have when spin clockwise
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negative
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what is the same as center of gravity
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center of mass
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a net force that acts on a system and causes circular motion at a constant speed and fixed radius
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centripetal force
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center of fleeing force
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centrifugal force
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the product of a body's rotational inertia and rotational velocity about a particular axis
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angular momentum
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when no external torque acts on an object or a system of objects, no change in angular momentum can occur
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conservation of angular momentum
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the product of the mass of an object and its velocity
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momentum
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the product of the force acting on an object and the time during which it acts
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impulse
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impulse is equal to the change in the momentum of the object that the impulse acts upon
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relationship of momentum and impulse
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in the absence of an external force, the momentum of a system remains unchanged
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law of conservation of momentum
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simple machine consisting of a rigid rod pivoted at a fixed point called a fulcrum
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lever
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the percentage of the work put into a machine that is converted into useful work output
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efficiency
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any object that moves through the air or through space under the influence of gravity
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projectile
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the curved path followed by a projectile under the influence only of constant gravity
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parabola
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