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Chapter 2 Study Sheet Name: _______________________________ Match the vocabulary words with their definition. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. ____ force ____ contact force ____ noncontact force ____ net force ____ unbalanced force ____ balanced force ____ Newton’s 1st Law ____ gravity ____ law of universal gravitation ____ weight ____ friction ____ elastic force ____ tension force ____ compression force ____ normal force ____centripetal force ____ Newton’s 2nd Law ____ Newton’s 3rd Law A. Is the net force of an object is zero, an object at rest stays at rest of an object in motion stays in motion B. When the net force of an object is not zero C. When one object exerts a force on a second object, the second object exerts an equal force in the opposite direction on the first object D. Gravitational force exerted on an object E. Force that one object exerts on another when they are not touching F. Pushing force exerted by a material when it is squeezed or compressed G. Force exerted by material when it is stretched or compressed H. Force exerted only when two objects are touching I. Force that is perpendicular to the velocity and toward the center of the circle J. When the net force of an object is zero K. Pulling force exerted by a material when it is stretched L. Attractive force that exists between all objects that have mass M. Push or a pull N. The acceleration of an object equals the net force divided by the object’s mass O. The combination of all the forces acting on an object P. Force that opposes the movement between two surfaces in contact Q. All object are attracted to each other with a force that depends on the masses of the objects and the distance between them R. Force exerted by an object that is perpendicular to the surface of the object 19. A force must include: a.___________________________ and b. ___________________________________ 20. What do you need to know to determine the net force? __________________ and ___________________ 21. A force of 20N is applied to an object in a positive direction and a force of 10N is applied in the negative direction. What is the resulting force? ___________________ 22. How much force is needed to stop the bicycle? 23. What forces act on a basketball flying in the air? 24. How are inertia and mass related? 25. If gravity on earth increased, how would this affect the solar system? If gravity decreased? 26. As the mass of one or more objects increases, the gravitational force becomes (stronger/weaker). 27. You are moving into a new house and packing boxes of kitchen supplies. Box A weighs 400g and box B weighs 200g. In order to push both boxes with the same speed, what will you need to do? 28. Susie is pulling a wagon with a watermelon in it. As she continues to shop at the farmers market, she adds more fruits and vegetables to her wagon. She does not change the amount of force she is using to pull the wagon. What is happening to the speed of the wagon? 29. Label forces A, B, and C. 30. Circle the objects that need a larger force to overcome inertia. Bus/Bike Dog/Bear Truck/Motorcycle School Bus/Car 31. Stretching force works in opposition to ___________________ 32. Solve for the following net forces. Draw the net force and label it: a. 20N 30N 50N 75N 75N 25N 10N 5N 15N 25N b. c. d. e.