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Segment 1, p. 22-29, Earth's Movement in Space
By William Schammann
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The spinning of the Earth on it's axis is called a _______________. p. 23
rotation
revolution
orbit
cycle
One revolution of the Earth around the Sun takes approximately _______________. p.24
24 hours
30 days
365 days
10 years
We have different seasons because of ___________________. p. 25
the Earth's rotation
the Earth's revolution
the Earth's orbit
the Earth's tilt on it's axis
Look at figure 3 on p. 25. Which month is the sun shining most directly on the northern hemisphere?
June
September
December
March
The length of the day is the same everywhere in the world. p. 26
True
False
When the Northern Hemisphere is at its strongest tilt towards the sun, it is called _____________. p. 26
a solstice
an equinox
a rotation
spring
The force that attracts all objects toward each other is called ______________. p. 27
inertia
gravity
tension
normal force
Newton's law of univeral gravitation states that the strength of gravity between two objects depends on which 2 factors? p. 27
the weight of the objects and the distance between them
the density of the objects and the distance between them
the size of the objects and the distance between them
the mass of the objects and the distance between them
An object's mass can change depending on what planet it is on. p. 27
True
False
If you weighed 120 pounds on Earth, how much would you weigh on the moon? p. 27
120 pounds
60 pounds
720 pounds
20 pounds
If the sun is constantly pulling on the Earth then why doesn't the Earth crash into the sun? p. 28
the Earth's gravity
the Earth's weight
the Earth's inertia
the Earth's rotation
Which of these is
not
an example of inertia? p. 28
a book sitting on a desk
when you are riding in a car and it stops suddenly but you keep moving forward
a rock sitting on the ground
an apple falling out of a tree to the ground
What is Newton's first law of motion? p. 28
An object at rest will stay at rest and an object in motion will stay in motion.
Force is equal to mass times acceleration.
For every action there is an equal and opposite reaction.
The strength of gravity between two objects depends on their masses and the distance between them.
Planet's orbits are held in place by what two forces? p. 29
speed and velocity
gravity and inertia
gravity and speed
inertia and velocity