Science Ch 15 Question Preview (ID: 54915)


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A magnet created by using an electric current is called
a) electromagnet
b) poles
c) lodestones
d) gold

A________________is a simple machine that consists of two inclined planes back to back.
a) pulley
b) wedge
c) wheel and axle
d) screw

A___________is a lever coiled around a cylinder
a) wedge
b) pulley
c) screw
d) wheel and axle

Newton's first law of motion states that an object at rest will remain unless__________acts on it.
a) a force
b) time
c) inertia
d) velocity

To calculate distance, ___________the average speed by the time it took the object to travel that distance.
a) add
b) subtract
c) divide
d) multiply

________magnets have a north and south pole.
a) All
b) Some
c) Two
d) A few

To calculate the ____________of an object, divide the distance the object travels by the amount of time it takes to travel that distance.
a) Speed
b) Velocity
c) Acceleration
d) Work

____________is a measure of an object's speed and its direction.
a) Speed
b) Acceleration
c) Velocity
d) Work

____________is done when a force moves an object over a distance.
a) Work
b) Acceleration
c) Velocity
d) Speed

The amount of force needed to accelerate a mas of 1 kg by a speed of 1 mps per second is ___________________
a) friction
b) Newton
c) work
d) speed

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