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Chapter 6 Newton's Second Law of Motion-Force and Accessor 11. Circle the letter of each statement related to Newton's second law that is true. a. Acceleration is directly proportional to the net force. b. The direction of acceleration is the same as the net force C. Acceleration is inversely proportional to mass. d. Net force and mass are always equal. 12. When using the equation for Newton's second law, if force is measured in newtons, then the unit for acceleration is __ and the unit for mass is __ 13. Is the following sentence true or false?The acceleration of an object is equal to the net force acting on it divided by the object's mass __ 14. A 100-N force is used to accelerate a large push cart across the floor.Circle the letter of the force required to accelerate the push cart twice as fast. a. 50 N b. 100 N C. 150 N d. 200 N 15 An object accelerates when a net force is applied to it. Circle the letter describing the conditions that would double the object's acceleration. a. doubling the mass b. halving the force C. doubling the mass and halving the force d. halving the mass 16. During a lab experiment, a net force is applied to an object and the object accelerates. The mass of the object is then doubled, and the net force applied to it also doubles. Describe the object's acceleration. __ 17. Circle the letter of the equation that motion. a. a=(F)/(m) b. F=ma^2 C. F=(a)/(m) d. F=(1)/(2)(am)^2 18. Describe what causes friction between two solid surfaces. __ 6.4 Friction (page 90-91 19. Is the following sentence true or types of materials in contact with each other. __ 20. Is the following sentence true or false? Friction depends on how much the materials in contact are pushed together. __ 42 Conceptual Physics Reading and Study Workbook - Chapter 6

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Chapter 6 Newton's Second Law of Motion-Force and Accessor 11. Circle the letter of each statement related to Newton's second law that is true. a. Acceleration is directly proportional to the net force. b. The direction of acceleration is the same as the net force C. Acceleration is inversely proportional to mass. d. Net force and mass are always equal. 12. When using the equation for Newton's second law, if force is measured in newtons, then the unit for acceleration is __ and the unit for mass is __ 13. Is the following sentence true or false?The acceleration of an object is equal to the net force acting on it divided by the object's mass __ 14. A 100-N force is used to accelerate a large push cart across the floor.Circle the letter of the force required to accelerate the push cart twice as fast. a. 50 N b. 100 N C. 150 N d. 200 N 15 An object accelerates when a net force is applied to it. Circle the letter describing the conditions that would double the object's acceleration. a. doubling the mass b. halving the force C. doubling the mass and halving the force d. halving the mass 16. During a lab experiment, a net force is applied to an object and the object accelerates. The mass of the object is then doubled, and the net force applied to it also doubles. Describe the object's acceleration. __ 17. Circle the letter of the equation that motion. a. a=(F)/(m) b. F=ma^2 C. F=(a)/(m) d. F=(1)/(2)(am)^2 18. Describe what causes friction between two solid surfaces. __ 6.4 Friction (page 90-91 19. Is the following sentence true or types of materials in contact with each other. __ 20. Is the following sentence true or false? Friction depends on how much the materials in contact are pushed together. __ 42 Conceptual Physics Reading and Study Workbook - Chapter 6

Chapter 6 Newton's Second Law of Motion-Force and Accessor 11. Circle the letter of each statement related to Newton's second law that is true. a. Acceleration is directly proportional to the net force. b. The direction of acceleration is the same as the net force C. Acceleration is inversely proportional to mass. d. Net force and mass are always equal. 12. When using the equation for Newton's second law, if force is measured in newtons, then the unit for acceleration is __ and the unit for mass is __ 13. Is the following sentence true or false?The acceleration of an object is equal to the net force acting on it divided by the object's mass __ 14. A 100-N force is used to accelerate a large push cart across the floor.Circle the letter of the force required to accelerate the push cart twice as fast. a. 50 N b. 100 N C. 150 N d. 200 N 15 An object accelerates when a net force is applied to it. Circle the letter describing the conditions that would double the object's acceleration. a. doubling the mass b. halving the force C. doubling the mass and halving the force d. halving the mass 16. During a lab experiment, a net force is applied to an object and the object accelerates. The mass of the object is then doubled, and the net force applied to it also doubles. Describe the object's acceleration. __ 17. Circle the letter of the equation that motion. a. a=(F)/(m) b. F=ma^2 C. F=(a)/(m) d. F=(1)/(2)(am)^2 18. Describe what causes friction between two solid surfaces. __ 6.4 Friction (page 90-91 19. Is the following sentence true or types of materials in contact with each other. __ 20. Is the following sentence true or false? Friction depends on how much the materials in contact are pushed together. __ 42 Conceptual Physics Reading and Study Workbook - Chapter 6

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11. **a, b, c** are true. d is false. Mass and net force are directly proportional, not always equal.<br /><br />12. When using the equation for Newton's second law (F=ma), if force is measured in newtons, then the unit for acceleration is **m/s²** and the unit for mass is **kg**.<br /><br />13. **True**. This is a direct statement of Newton's second law (a = F/m).<br /><br />14. **d. 200 N**. Newton's second law states F=ma. To double the acceleration while keeping the mass constant, you must double the force.<br /><br />15. **d. halving the mass**. Since a = F/m, halving the mass while keeping the force constant will double the acceleration.<br /><br />16. The object's acceleration will remain the **same**. Doubling the mass would halve the acceleration, but doubling the force would double the acceleration. These two changes cancel each other out.<br /><br />17. **a. a = F/m** is the correct equation representing Newton's second law of motion.<br /><br />18. Friction between two solid surfaces is caused by **microscopic irregularities** in the surfaces that catch on each other. Even seemingly smooth surfaces have these irregularities. Also contributing is the **electromagnetic attraction** between the atoms of the two surfaces in close contact.<br /><br />19. **True**. The coefficient of friction is a property that depends on the types of materials in contact.<br /><br />20. **True**. The greater the force pushing the surfaces together (normal force), the greater the friction.<br />
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