Forces and Machines
An object that makes work easier is called
a. force
b. machine
c. energy
d. gravity
What is a machine?
Everything contains small particles of electricity called:
a. positive charges
b. negative charges
c. electric charges
d. neutral charges
What are electric charges?
Objects that make their own light are
a. opaque
b. luminous
c. nonluminous
d. translucent
What is luminous?
Any object that travels around another object in space is called a
a. satellite
b. crater
c. revolution
d. rille
What is a satellite?
When water changes into a gas or water vapor, the process is called
a. evaporation
b. condensation
c. precipitation
d. water cycle
What is evaporation?
The amount of work you do depends on how much __________ you use to move an object.
a. energy
b. force
c. friction
d. gravity
What is force?
Objects that push away from one another, or repel, have this type of charge:
a. same
b. opposite
c. neutral
d. no charge
What is the same charge?
Allows all light rays to pass through
a. translucent
b. transparent
c. opaque
What is transparent?
A measurement of the amount of matter an object has is called its
a. weight
b. mass
What is mass?
When water vapor changes into water to form clouds, the process is called
a. evaporation
b. condensation
c. precipitation
d. water cycle
What is condensation?
The force applied to cause a simple machine to do work is called:
a. effort
b. energy
c. work
d. motion
What is effort?
a. conductor
b. insulator
c. circuit
What is an insulator?
Allows some light rays to pass through
a. transparent
b. translucent
c. opaque
What is translucent?
This word means something is traveling around something else-such as the moon traveling around the earth.
a. revolves
b. rotates
What is revolves?
The rise and fall of the water level of the ocean is called
a. wave
b. gravity
c. tide
What is a tide?
The weight of the object being moved is called the
a. load
b. mass
c. work
What is load?
A circuit that connects several objects in one complete path is called
a. parallel circuit
b. series circuit
What is a series circuit?
All the colors that make up light are called the __________ spectrum
a. light
b. visible
c. invisible
d. dark
What is visible spectrum?
Lenses that bend light outward are called
a. concave
b. convex
What is concave?
Which of the following does not determine the size of a wave?
a. wind speed
b. temperature
c. time the wind blows
d. distance the wind blows
What is temperature?
Which of the following is not a simple machine?
lever, wheel and axle, tractor, pulley, inclined plane, screw, wedge
What is a tractor?
Define each simple machine
A temporary magnet formed when electric current flows through a wire coiled around certain metal cores
a. generator
b. magnet
c. magnetism
d. electromagnet
What is an electromagnet?
The bending of light as it passes from one substance to another is called
a. reflection
b. absorption
c. refraction
What is refraction?
The moon's orbit is like a slightly flattened circle. This is also known as
a. eclipse
b. ellipse
What is an ellipse?
The usual weather of an area over a long period of time is called the
a. current
b. temperature
c. climate
d. ecosystem
What is climate?