Example 1 Conservation of Momentum Bar Graph Examples If the system includes both the man and the...

Example 1 Conservation of Momentum Bar Graph Examples If the system includes both the man and the boy it is then an isolated, closed system and momentum is conserved. Man Man / 70. kg Man / 70. kg / 0 m/s Boy Boy / 35 kg Boy / 35 kg / 0 m/s Man Man / 70. kg Man / 70. kg / - 0.30 m/s Boy Boy / 35 kg Boy / 35 kg / ? Init ial Fina l Object / Mass / Velocity + - Momentum + - Momentum Object / Mass / Velocity boy? the of velocity final the is What of speed a with away moves man the that so apart other each push They surface. ice smooth a on together standing are mass of boy a and mass of man A . 30 0 35 70 s m . kg . kg 0 0 s kgm 21 s kgm 21

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Transcript of Example 1 Conservation of Momentum Bar Graph Examples If the system includes both the man and the...

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Example 1

Conservation of Momentum Bar Graph ExamplesIf the system includes both the man and the boy it is then an isolated, closed system and momentum is conserved.ManMan / 70. kgMan / 70. kg / 0 m/sBoyBoy / 35 kgBoy / 35 kg / 0 m/sManMan / 70. kgMan / 70. kg / -0.30 m/sBoyBoy / 35 kgBoy / 35 kg / ?InitialFinalObject / Mass / Velocity

+-Momentum

+-MomentumObject / Mass / Velocity

1Example 1

ManMan / 70. kgMan / 70. kg / 0 m/sBoyBoy / 35 kgBoy / 35 kg / 0 m/sManMan / 70. kgMan / 70. kg / -0.30 m/sBoyBoy / 35 kgBoy / 35 kg / ?InitialFinalObject / Mass / Velocity

+-Momentum

+-MomentumObject / Mass / Velocity

Notice the boy has half the mass so twice the velocity!Conservation of Momentum Bar Graph Examples2Example 2

a.What is the final velocity of the bullet and the block after the collision?If the system includes both the bullet and the wood it is then an isolated, closed system and momentum is conserved.BulletBullet / 0.010 kgBullet / 0.010 kg / 400. m/sWoodWood / 0.39 kgWood / 0.39 kg / 0 m/sComboCombo / 0.40 kgCombo / 0.40 kg / ?InitialFinalObject / Mass / Velocity

+-Momentum

+-MomentumObject / Mass / Velocity

Conservation of Momentum Bar Graph Examples3Example 2

a.What is the final velocity of the bullet and the block after the collision?BulletBullet / 0.010 kgBullet / 0.010 kg / 400. m/sWoodWood / 0.39 kgWood / 0.39 kg / 0 m/sComboCombo / 0.40 kgCombo / 0.40 kg / ?InitialFinalObject / Mass / Velocity

+-Momentum

+-MomentumObject / Mass / Velocity

Notice that more mass is moving at a slower velocity!Conservation of Momentum Bar Graph Examples4Example 2

b.What are the initial and final kinetic energies of the bullet, wood block system?

This is an inelastic collision.Most of the energy is dissipated and is stored as increased thermal energy in the bullet/block system.Conservation of Momentum Bar Graph Examples5