Collisions and Explosions Pre-Lab Unit 9

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Presentation transcript:

Collisions and Explosions Pre-Lab Unit 9

2 kinds of collisions - Inelastic and elastic

Make a prediction about the conservation of momentum and kinetic energy in both elastic and inelastic collisions.

What factors can you change and measure to test your prediction? ????

My suggestions: Mass of cart Velocity of each cart Sticking together or not

After lab, define elastic and inelastic to see if your prediction and your data are correct!

Website: http://www.physics.uoguelph.ca/phyjlh/Fendt/phe/collision.htm

Collisions and Explosions Post-Lab Unit 9

Examples of Momentum Charts A 40 kg girl rollerblades at 4 m/s toward her 20 kg dog, who is running at 7 m/s in the opposite direction. The dog leaps into the girl’s arms and they continue rolling together. Determine their velocity. m v 40 kg 20 kg 4 m/s 40 kg + 20 kg Vf -7 m/s

2) A 0.03 kg bullet travelling at 300 m/s ricochets off a wall at 100 m/s in the opposite direction. Determine the momentum transferred to the wall-earth system. m v 0.03 kg 300 m/s -100 m/s ∆pw

FDt = mDv = Dp If there is a large impulse, the Dp will be great. If there is a large force, there is a large acceleration, making Dv large Large changes in p damage skin, bones, car bodies, etc… Padding, follow through, seat belts, airbags reduce the change in momentum