Progress Assessment 1 2012 KEY

# 8 what does the following position vs time graphs

• Notes
• apiccirello
• 6

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8. What does the following position vs. time graphs below illustrate about the objects speed? ^constant speed ^decreasing speed ^no motion changing speed 2 | P a g e x (m) t (s) x (m) t (s) x (m) t (s) x (m) t (s)

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9. Plot the following data on the axes below: Time (s) Position (meters) 0 0 1 5 2 15 3 30 4 50 5 80 10. Does it take more force to stop a bowling ball or a tennis ball? Why? 3 | P a g e
Bowling ball has more mass thus more inertia (the bowling ball requires a greater force to stop it.) 11. A force of 500-N propels a 1000-kg train down a track. If a frictional force of 200 N acts on the train determine the (a) the net force acting on the train and Looking For Given Relationship Solution Net force F 2 =500 N F 1 =200 N F 2 -F 1 300 N (b) the acceleration of the train and the direction the train is accelerating. Looking For Given Relationship Solution Acceleration F=300 N M=1000 kg a=F/m 0.3 m/s 2 12. A 50-N force is applied to a 2-kg box to move it across the floor. A 10-N frictional force acts on the box. Determine the net force acting on the box? Determine the acceleration of the box? Looking For Given Relationship Solution Net force F 2 =50 N F 1 =10 N F 2 -F 1 40 m/s 2 Looking For Given Relationship Solution Acceleration F=40 N M=2 kg a=F/m 20 m/s 2 13. What is Newton’s 1 st law of motion?

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• Fall '12
• Beatty

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