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Phy107Spr07Lect05

# Phy107Spr07Lect05 - H W 1 d u e T h u rsd a y m id n it e...

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1 Phy107, Spring 2007 1 Wed. Jan. 31 From Last Time… Defined momentum (signified by letter ‘p’) : momentum describes the ‘amount of motion’ momentum = mass x velocity ( p = mv ) • Conservation of momentum: total momentum is fixed it can be transferred between objects • Newton: changes in momentum are caused by forces HW#1 due Thursday midnite Course web site: uw.physics.wisc.edu/~rzchowski/phy107 Phy107, Spring 2007 2 Wed. Jan. 31 Newtonian Forces • Newton investigated how momentum was changed. • Quantified notion of a ‘disturbance’. • Said that a force changed the momentum. F 1 Phy107, Spring 2007 3 Wed. Jan. 31 More than one force… • Total force determines momentum change • If F 1 and F 2 balance, momentum change is zero. if no momentum change observed, net (total) force is zero F 1 F 2 Phy107, Spring 2007 4 Wed. Jan. 31 Forces An object moves to the right in a straight line at constant speed. Which one of the following is true? A. No forces are acting on the object. B. A larger number of forces are acting on the object to the right than to the left. C. The net force acting on the object is to the right. D. Just one force is acting on the object. E. No net force is acting on the object. Phy107, Spring 2007 5 Wed. Jan. 31 How does force change motion? • Direction of motion change? – same direction as force • Effect of applying bigger force? – bigger force gives bigger momentum change

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Phy107Spr07Lect05 - H W 1 d u e T h u rsd a y m id n it e...

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