Momentum and Impulse: Lesson 3.  It`s not how fast you are going: it is how fast you stop  To reduce the impact force, increase the stopping distance.

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Presentation transcript:

Momentum and Impulse: Lesson 3

 It`s not how fast you are going: it is how fast you stop  To reduce the impact force, increase the stopping distance or increase the stopping time constan t

What if the driver wears a seatbelt and the car has an airbag? The airbag inflates in 3/100 s so the driver comes to rest in 1.0 s. Determine the impact force now. Eg) The driver of a car has a mass of 100 kg. The car is travelling at 100 km/h. Impact The driver is not wearing a seat belt. It takes 0.10s for the driver to impact onto a concrete wall and stop Determine the impact force on the driver.

Concrete floor Very short stopping distance -High impact force F(up) foam Greater stopping distance, less impact force ball If you increase the stopping distance or increase the stopping time, there is less impact force resulting in less injury being sustained

 Definition: in an isolated system the total momentum before a collision or interaction is equal to the total momentum after the collision  Total momentum remains constant  Isolated system – is a condition in which there is no exchange of matter of energy  Collision – interaction or contact of two or more objects during a short period of time

1. Recoil Problems Eg) A 500 kg cannon fires an 800 g shell at a velocity of 700 east. Determine the recoil velocity of the cannon. After Before

Eg) A 500 kg cannon fires an 800 g shell at a velocity of 700 east. Determine the recoil velocity of the cannon.

 Eg) A bomb bursts into two fragments, X and Y. Fragment X has a mass of 0.50 kg and is directed at 240 m/s left. Fragment Y has a mass 3.5 times that of X and moves in the opposite direction. Determine the velocity of Fragment Y.