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Name_________________________
Forces and motion
Directions: Write the force words that complete each sentences.
1. The greater the ____________ the easier the object will move.
2. To do job in less time and with less energy, use a ______________
3. That rock will roll down the hill due to the force of _____________
4. to make something _________ both ends need to have the same weight.
5. It takes ___________ to get a job done.
6. ____________ is the idea that something in motion will remain in motion, and
something at rest will remain at rest, unless affected by an outside source.
7. It would be more difficult to _________ a wagon if it didn’t have wheels.
8. If you have a few people __________ on the rope,
the box will be easier to
move.
9. _________’s theories on motion are still believed correct today.
10. We added wheels to our bureau to create less ________ when we move it.
Name__________________________________
Gravity
In this lecture, Paul Hewitt focuses on Newton’s law of universal gravitation and
how to interpret the corresponding equation. He illustrates
the nature of the
inverse square law and discusses the physics of weightlessness.
Read the
following questions before the presentation begins.
Answer them while the
presentation is in progress.
1.The pattern that connects objects in the universe can be expressed as a simple
mathematical relationship. Write the relationship in the space below.
push pull gravity friction force
inertia machine energy balance Newton
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2.Isaak Newton did not discover gravity, but he did discover that gravity was
_______________________________________.
3.A certain gravitational force F exists between two planets having masses m
1
and
m
2
and a distance d between them.
What is the force if both masses are doubled?
A. one fourth as much
B. half as much
C. twice as much
D. four times as much
4.Which shape is a typical ellipse?
5.Which of this follows universe square law?
A. light intensity
B. radioactivity
C. magnetism
D. electricity
E. all of these
F. none of this
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