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Momentum-Impulse Theorem Collision: If no external force, momentum always conserved.

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Presentation on theme: "Momentum-Impulse Theorem Collision: If no external force, momentum always conserved."— Presentation transcript:

1 Momentum-Impulse Theorem Collision: If no external force, momentum always conserved.

2 Is the kinetic energy conserved? Inelastic collision Completely inelastic collision: stick together

3 Elastic collision If v 1i,v 2i is same direction

4 Object sticks to together: 1200-kg car moving at 2.5 m/s is struck in the rear by a 2600-kg truck moving at 6.2 m/s. If the vehicles stick together the collision, what is their speed immediately after colliding? (assume that external forces may be ignored) kg 1200 kg 6.2 m/s 2.5 m/s vfvf

5 Ballistic Pendulum In a ballistic pendulum, an object of mass m is fired with an initial speed v 0 at the bob of a pendulum. The bob has a mass M, and is suspended by a rod of negligible mass. After the collision, the object and the bob stick together and swing to through an arc, eventually gaining a height h. Find h in terms of m, M, v 0, and g

6

7 collision in 2D m 1 =950 kg m 2 =1300kg Completely Inelastic collision

8 Elastic collision: 96 kg 135 kg 1.24 m/s 0 m/s 96 kg 135 kg Find the final velocity of the car?


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