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55 Cards in this Set
- Front
- Back
What is the function of a generator?
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mechanical to electrical
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A circuit that has 2 or more branches to flow through is....
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parallel circuit
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Objects that keep their magnetic properties
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permanent magnets
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ride a bike up and down a hill....
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negative then positive
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formula for speed
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speed=distance/time
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A single point on a time graph tells
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instantaneous speed
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When a force is exerted on a box....
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action/reaction
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To which of the following is convection?
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liquids and gases
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If gravity did not affect the bath of a horizontally thrown ball...
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it would keep going horizontally
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abbreviation for momentum?
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P=momentum
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Newton's First Law of Motion is also called the...
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Law of Interia
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For an object, the greater the force the greater the...
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acceleration
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the speed on a speedometer...
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instantaneous speed
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the amount by which a machine multiples a effort force...
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mechanical advantage
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what is the acceleration due to gravity?
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9.8m/s2
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Which would be the best insulator?
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air
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a real car moving at 10km per hour has more momentum than a toy car b/c it has...
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greater mass
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a path that allows only one route for electricity...
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series circuit
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The unit for momentum is
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kgm/s2
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which of the following is a device to open an overloaded circuit?
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circuit breaker
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a static discharge differs from a electric current....
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blast for only a fraction of a second
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if a weightlifter is holding barbells above his head what does he have to do to do work?
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move to side to side
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the size of gravitational force depends on....
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masses and the distances between them..
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the unit for power
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watt
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a merry go round horse moves at a constant speed with changing....
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velocity
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a bus engine changes chemical potential energy so the bus moves and releases
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kinetic energy
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3 meters per second north
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velocity
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when 2 balls collide the momentum of the balls after the collision is explained by...
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the law of conservation of momentum
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a bad condutor
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air
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the SI unit for energy
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joule
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energy from the sun travels to the earth as...
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radiate energy
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in the absence of air, a penny and a feather will drop...
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at the same rate
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which does not make use of electric energy...
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piano
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a horizontal line on a velocity timegraph shows _____ acceleration..
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zero
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a bar that is free to pivate around a fixed point
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lever
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a transformer that increases voltage
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step up transformer
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the equation used to find acceleration?
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vf-vi/t
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the rate at which work is done
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power
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the statement that voltage differance is equal to current is...
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Ohm's law
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a material that reduces the flow of heat
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insulator
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the magnetic force of a magnet is
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stongest at the poles
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a device that increases or decreases voltage in a powerline
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transformer
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a winding mountain road
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incline plane
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in the u.s. powerlines can carry as much as 750,000 a transformer lowers it to
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120 volts
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increasing the speed of an object does what to it's pontential energy?
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has not effect
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a lever with mechanical advantage greater than one is used to
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increase force
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a current that reverses direction in a regular pattern
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alternating
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a device that does work with only one movement and changes direction and force..
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simple machine
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a feather will fall slower than a brick b/c of
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air resistance
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Motion is a change in
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position
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a material through which electrons do not flow
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insulator
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an object in freefall appears
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weightless
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an incline plane rapped around a cylentrical post is a
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screw
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the function of an electric motor is
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to change electrical energy into mechanical energy
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the function of generator is to
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change mechanical into electrical
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