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(forces, work and energy, machines, motion, gravity, friction, and…
forces
forces transfer momentum
objects in motion have momentum
momentum can be transfered from one object to another
momentum is conserved
two types of collisions
momentum and Newton's third law
forces change motion
types of forces
balanced and unbalanced forces
force and mass determine acceleration
newton´s first law
newton's second law
force equals mass times acceleration
mass and acceleration
centripetal force
circular motion and newtons second law of motion
forces act in pairs
newton first law relates to action and reaction forces
action and reaction pairs
action an reaction forces versus balanced forces
Newton's three laws describe and predict motion
work and energy
energy is transferred when work is done
work transfers energy
work changes potential and kinetic energy
calculating gravitational and potential energy
calculating kinetic energy
calculating mechanical energy
the total amount of energy is constant
conserving mechanical energy
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power is the rate at which work is done
power can be calculated from work and time
calculating power from work
horsepower
power can be calculated from time and energy
calculating power from energy
everyday power
work is the use of force to move an object
force is necessary to do work
force, motion, and work
calculating work
objects that are moving can do work
machines
six simple machines have any users
there are six simple machines
lever
wheel and axle
pulley
inclined plane
wedge
screw
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modern technology uses compound machines
compound machines are combinations of simple machines
gears
mechanical advantage of compound machines
modern technology creates new uses for machines
micro technology and nano technology
robots
machines help people do work
machines change the way force is applied
changing size and distance
changing direction
mechanical advantage of a machine
work transfers energy
energy
work
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motion
an object in motion changes position
describing a position
measuring distance
describing motion
relative motion
acceleration measures how fast velocity changes
calculating acceleration
acceleration over time
velocity- time graph
speed measures how fast position changes
calculating speed
average speed
distance- time graphs
velocity versus speed
gravity, friction, and pressure
Friction is a force in motion that opposes motion
friction occurs when surfaces slide against each other
forces and sufaces
friction and heat
motion through fluids produces friction
pressure depends on force and area
pressure describes how a force is spread over an area
pressure acts in all directions in fluids
pressure depends on depth
pressure in air
pressure in water
gravity is a force exerted by masses
masses attract each other
the force of gravity
gravity on earth
weight and mass
gravity keeps objects in orbit
spacecraft in orbit
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fluid can exert a force on objects
fluids can exert an upward force on object
buoyancy
density and Buoyancy
the motion of fluid affects its pressure
Bernoulli's principle
applying Bernoullis principle
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