Physics 2 – Jan 31, 2017 P3 Challenge– A 2.3 kg object traveling east with a velocity 4.0 m/s bounces off a wall and turns around, traveling at 3.0 m/s.

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Presentation transcript:

Physics 2 – Jan 31, 2017 P3 Challenge– A 2.3 kg object traveling east with a velocity 4.0 m/s bounces off a wall and turns around, traveling at 3.0 m/s. Find the impulse given to this object. Today’s Objective: Review Assignment: Study for test Momentum Test (80 pt) is Thursday Agenda Extra Review Problems Extra problems as needed.

Content overview Basic Momentum p=mv; a vector Change of momentum in 1 and 2 dimensions / impulse Newton’s 2nd law: p=Ft with F = net force during contact Conservation of momentum in collisions in 1 and 2 dimensions General inelastic m1v1 + m2v2 = m1v1 + m2v2 Completely inelastic Elastic (Special elastic solution equations will be on test.)

Exit Slip - Assignment Exit Slip-A chair is pulled out from a person just about to sit down. The 70 kg person falls 0.50 m to land on the hard floor. If the person is in contact with the floor for 0.082 s (for the first bounce), what are the a) impulse and b) average force acting on the person during the collision? (Assume the person’s velocity when starting to fall is zero.) What’s Due on Feb 2? (Pending assignments to complete.) Study for test Momentum Test on Thursday What’s Next? (How to prepare for the next day) Read 3.1 p116- 124 about Thermal Energy