Momentum-Impulse Theorem Collision: If no external force, momentum always conserved.
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Transcript of Momentum-Impulse Theorem Collision: If no external force, momentum always conserved.
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Momentum-Impulse Theorem
Collision:
If no external force, momentum always conserved.
fi pp
ifif vmvmppptFI
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Is the kinetic energy conserved?
Inelastic collision fi pp
fi KK
Completely inelastic collision: stick together
fii vmmvmvm
)( 212211
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Elastic collision fi pp
fi KK
222
211
222
211
22112211
2
1
2
1
2
1
2
1ffii
ffii
vmvmvmvm
vmvmvmvm
21
212112
21
121221
2211
)(2
)(2
mm
vmmvmv
mm
vmmvmv
vvvv
iif
iif
fifi
If v1i ,v2i is same direction
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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/svf
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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
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collision in 2D
m1=950 kgm2=1300kg
Completely Inelastic collision
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Elastic collision:
fi
fi
KK
pp
96 kg
135 kg
1.24 m/s 0 m/s
96 kg
135 kg
Find the final velocity of the car?