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Momentum-Impulse Theorem Collision:

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Presentation on theme: "Momentum-Impulse Theorem Collision:"— 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 v1i ,v2i 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). 2600 kg 1200 kg 6.2 m/s 2.5 m/s vf

5 Ballistic Pendulum In a ballistic pendulum, an object of mass m is fired with an initial speed v0 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, v0, and g


7 collision in 2D m1=950 kg m2=1300kg Completely Inelastic collision

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

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