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