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# Redlands PHYS 231 - Study Notes

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Reading Worksheet 3a Name:_____________________Read Sections 2.1 – 2.5 of Ch.2 (handout-version)Due Monday 15-JanuaryBefore doing this assignment, study the textbook, doing the "stop and think" activities and the in-line exercises.1. A spring is 0.16 m long when it is relaxed. When a force of magnitude 150 N is applied, the spring becomes 0.30 m long. What is the stiffness of this spring?ks = ______________________N/m2. The spring in the previous exercise is now compressed so that its length is 0.14 m. What magnitude of force is required to do this?|F| = ____________________N3. A balloon experiences a gravitational force of <0, -0.04,0> N and a force due to the wind of <0.03, 0 , 0.02. N. What is the net force acting on the balloon?NFnet ______________,____________,__________4. At t = 18.0 seconds an object with mass 3 kg was observed to have a velocity of <9, 30, -9> m/s. At t = 18.3 seconds its velocity was <18, 22, 23> m/s.What was the average (vector) net force acting on the object?netF= < ________, ________ , ________ > N5. A hockey puck is sliding along the ice with nearly constant momentum <14, 0, 4>kg · m/s when it is suddenly struck by a hockey stick with a force = <0, 0, 2000> N that lasts for only 4milliseconds (4 ×10-3 s).What is the new momentum of the puck? fp = <________ ,______ ,_______ > kg · m/s6. At t=0s, a ball is kicked from a location m4,0,3  (on the ground) with an initial velocity sm /4,10,9 .a. What is the velocity of the ball 0.4 seconds after being kicked?smsv /_______________,_______,)4.0( b. What is the location of the ball 0.4 seconds after being kicked?msr _______________,_______,)4.0( c. What is the maximum height reached by the ball?mypeak_____________d. At what time does the ball reach its maximum height?stpeak_____________e. At what time does the ball hit he ground?sthit_____________f. What is the location of the ball when it hits the

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