Download Newton`s Three Laws: Answer the questions below using pages 389

Newton’s Three Laws: Answer the questions below using pages 389-405 in the textbook.
Use the back of this page for your answers if you need more room to write.
1. Who suggested that once an object is in motion no force is necessary to keep it
moving? Who built upon this idea?
2. What does Newton’s first law state? Give an example from the textbook. What
changes a tennis balls velocity on Earth? What is inertia? What is Newton’s first law
called? Explain how inertia depends upon mass.
3. What is Newton’s second law? How are acceleration, mass and force measured? Write
the law as an equation in two ways.
4. What is the net force acing on a 0.15 kg object accelerating at 12 m/s2? What is the
acceleration of an 800 kg car with a net force of 4000 N? Show your work.
5. What is Newton’s third law? What is another way to state the third law? Give three
examples from the textbook. Does a pencil dropped pull on the Earth? Why don’t you
see the Earth move? Why don’t action-reaction forces cancel? Explain why the forces in
Figure 17 don’t cancel in the left picture but do in the right picture.
6. What did Newton call momentum? What is the equation for momentum? Which is
harder to change a moving baseball or a moving tennis ball? Why? What is the
momentum of an object with mass 100 kg and velocity 10 m/s?
7. In everyday language what does conservation mean? What does it mean in science?
What does the law of conservation of momentum state? What is the outside force that
usually acts on objects? If the total momentum between two cars that collide is 1000 kg x
100 m/s before a collision what will it be after they collide?
8. What was the first artificial satellite? What is the mass of the space shuttle? Why can
a rocket rise into the air? What is the upward force called? What is a satellite? What is
centripetal force? Explain why satellites are accelerating?
9. Why do satellites fall around the Earth and balls thrown don’t? What is the speed
necessary to orbit Earth? How high is low Earth orbit? How high are communications
satellites? How often do they circle Earth?