Activity 3-1: Kinetic Energy In this activity you will explore the meaning of kinetic energy, and see how it is calculated. 1. Toss one book up in the air and catch it. If you throw it faster it will go higher. Alternate between fast tosses and slow tosses. Notice how much effort it takes to throw it and to catch (stop) it when it is moving quickly or slowly. Question 3-1: Does the effort needed to stop the book seem to change as its speed increases? How does it change? Explain. Question 3-2: Does the effort needed to throw the book seem to change as its speed increases? How does it change? Explain. 2. Now toss the two books together (some rubber bands will help in having them stay together). Compare tosses of one and two books that go up at the same speed. Again notice how much effort it takes to toss and stop the book(s). Question 3-3: Does the effort needed to stop the two books seem to change as the mass increases compared to a single book? How does it change? Explain. Question 3-4: Does the effort needed to throw the two books seem to change as the mass increases compared to a single book? How does it change? Explain.

Activity 3-1: Kinetic Energy In this activity you will explore the meaning of kinetic energy, and see how it is calculated. 1. Toss one book up in the air and catch it. If you throw it faster it will go higher. Alternate between fast tosses and slow tosses. Notice how much effort it takes to throw it and to catch (stop) it when it is moving quickly or slowly. Question 3-1: Does the effort needed to stop the book seem to change as its speed increases? How does it change? Explain. Question 3-2: Does the effort needed to throw the book seem to change as its speed increases? How does it change? Explain. 2. Now toss the two books together (some rubber bands will help in having them stay together). Compare tosses of one and two books that go up at the same speed. Again notice how much effort it takes to toss and stop the book(s). Question 3-3: Does the effort needed to stop the two books seem to change as the mass increases compared to a single book? How does it change? Explain. Question 3-4: Does the effort needed to throw the two books seem to change as the mass increases compared to a single book? How does it change? Explain.

Inquiry into Physics

8th Edition

ISBN:9781337515863

Author:Ostdiek

Publisher:Ostdiek

Chapter3: Energy And Conservation Laws

Section: Chapter Questions

Problem 7Q: (Indicates a review question, which means it requires only a basic understanding of the material to...

See similar textbooks

Similar questions

(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) 26. Is it possible for one object to gain mechanical energy from another without touching it? Explain.
(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) 13. When you throw a ball, the work you do to accelerate it equals the kinetic energy the ball gains. If you do twice as much work when throwing the ball, does it go twice as fast? Explain.
(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) 15. How can the gravitational potential energy of something be negative?
What do we pay the electric company for, power or energy? In what units?
A couple of soccer balls of equal mass are kiched off the ground at the same speed but at different angles. Soccer ball A is kicked off at an angle slightly above the horizontak, whereas boll B is kicked slightly below the vertical. How do each of the following compare for ball Aand ball B? (a) The initial kinetic energy and (b) the change in gravitational potential energy from the ground to the highest point? If the energy in part (a) differs from part (b), explain why there is a differenne between the two energies.
(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) 6. Describe several things you have done today that involved doing work. Are you doing work right now?
A man of mass 80 kg runs up a flight of stairs 20 m high in 10 s. (a) how much power is used to lift the man?(b) If the man’s body is 25 efficient, how much power does he expend?
How much work does the force do on a particle as it moves from to
Give an example of something we think of as work in everyday circumstances that is not work in the scientific sense. Is energy transferred or changed in form in your example? If so, explain how this is accomplished without doing work.
Give an example of something think of as work in everyday circumstances that is not work in the scientific sense. Is energy transferred or changed in form in your example? If so, explain how this without doing work.
Most electrical appliances are rated in watts. Does this rating depend on how long the appliance is on? (When off, It is a zero-wan device.) Explain in terms of the definition of power.
A single force F(x)=4.0x (in newtons) acts on a 1.0-kg body. When x=3.5 m, the speed of the body is 4.0 m/s. What is its speed at x = 2.0 m?