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100
A ferris wheel is run by what simple machine?
a wheel and axle
100
Why can't you feel the Earth's movement?
You cannot feel the Earth's movement because Earth moves steadily and smoothly.
100
What kind of motion does a guitar string move in after it is plucked?
a back and forth motion
100
What is work?
pushing or pulling on an object to make it move
100
What can you describe using speed and direction?
velocity
200
What side of the moon faces Earth as the moon orbits around the Earth?
the same side
200
What happens to the effort when an additional pulley is added to a compound pulley?
The amount of effort is reduced.
200
Why does day turn into night?
the Earth rotates
200
When does a lunar eclipse occur?
when the moon passes through the Earth's shadow
200
How do simple machines make tasks easier?
They decrease the amouont of force needed to do a task.
300
What is rotation?
the spinning of Earth around its axis
300
What is a constellation?
a pattern of stars
300
In what direction does the Earth rotate?
from west to east
300
What happens if balanced forces are applied to a moving object?
The object keeps moving at the same speed and direction.
300
What is the spinning of Earth around its axis?
rotation
400
What type of simple machines are nutcrackers, pliers, and ice tongs
levers
400
What is a medium-sized star nearest Earth?
the sun
400
Why do the seasons change?
because of the Earth's tilt
400
What kind of simple machine is a wheel chair ramp?
an inclined plane
400
What is a pattern of stars?
constellation
500
How much of the moon can you see during the first quarter and last quarter moon?
You can see half of the lighted half of the moon.
500
What three simple machines are found in a can opener?
lever, wedge, and a wheel and axle
500
Where should you place the fulcrum to use the least amount of effort with a lever?
closer to the load than the effort
500
What kind of simple machine is made from two inclined planes?
a wedge
500
What 3 simple machines are found in a can opener?
lever, wedge, and wheel and axel