Part B: Completion: Knowledge and Understanding (17) Complete each sentence or statement. 18. In the diagram below, when the system is being pulled to the right, the greatest tension is T₁ and the least is T₁₂ T3 19. For two given surfaces in contact with one another, the coefficient of kinetic friction is generally than the corresponding coefficient of static friction. 20. A rock is tied to the end of a string and whirled around in a circle that describes a vertical plane. The position of the stone when the tension in the string is the greatest is_ The position of the stone when the tension in the string is the least is_ 21. For a planet orbiting the Sun, the centripetal force is supplied by_ 22. If Earth's radius and mass were both twice their present values, the acceleration due to gravity at Earth's surface would have a value of 23. m/s². law states that the magnitude of the force exerted by an ideal spring is directly proportional to the distance the spring moves from equilibrium. 24. The change in momentum of an object is called the_ 25. A ball is dropped and bounces back to 90% of its original height. The collision between the ball and the ground was 26. The force of attraction between all objects with mass is called 27. One charge freely moves away from another charge. The force between the two charges changes while the total energy is 28. The bending of a wave due to changing speed is called_ 29. Energy radiates from an atom in bundles called 30. A decay that involves a high speed electron is a(n)_ _decay. 31. The time required to reduce radioactivity by 50% is the_ 5 of 13

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1. Here's our force diagram from Part 1:     In this drawing, we've rotated the coordinate axes so the x-axis is parallel with the ramp surface and the y-axis is perpendicular. Now most of the forces are aligned with the axes, except one. Which force is not aligned with the new axes?   Hint: Note: our textbook would label F_{string}Fstring​ as either F_TFT​ or just TT for the tension force.   F_gFg​ , the force of earth's gravity on the object, also known as the weight w of the object.   F_NFN​, the normal force (sometimes labeled n ) on the object by the ramp surface.   F_TFT​, the tension force on the cart by the string

Free-Body Diagrams and Forces Force and Motion Explore Student Journal Name: Date: Part I: Understanding Forces and Motion FN 3 N 3 N West East Fg 1.Are the forces balanced or unbalanced as shown on the free-body diagram? 2.Describe what you did to model the system shown. 3.When the block was released, did the result support your prediction? Explain using the terms balanced and unbalanced forces. FN 6 N West East Fg 4.Are the forces balanced or unbalanced as shown in the free-body diagram? 5.Describe what you did to model the system shown. 1 OAccelerate Learning Inc. - All Rights Reserved

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Newton's 3rd Law Discussed Learning Goal: To understand Newton's 3rd law, which states that a physical interaction always generates a pair of forces on the two interacting bodies. Part B In Principia, Newton wrote: To every action there is always opposed an equal reaction: or, the mutual actions of two bodies upon each other are always equal, and directed to contrary parts. The two forces in each pair act in opposite directions. (translation by Cajori) O true The phrase after the colon (often omitted from textbooks) makes it clear that this is a statement about the nature of force. The central idea is that physical interactions (e.g., due to gravity, bodies touching, or electric forces) cause forces to arise between pairs of bodies. Each pairwise interaction produces a pair of opposite forces, one acting on each body. In summary, each physical interaction between two bodies generates a pair of forces. Whatever the physical cause of the interaction, the force on body A from body B is…

1 Normal Heading 1 Heading 2 1 Table Ca.. 1 風風 Styles Paragraph body diagram of the pulley (Figure 4) to answer the Pre-Lab Questions. Pulley Ascending Mass, M, Descending Mass, M F, = M,g %3D F =M.g %3D Figure 4: Free Body Diagram: 2 objects with mass hanging on a pulley by string. %66 1O