## GBS Physics Resources

The Physics Classroom

# Henderson's Physics 163

### Chapter 9 Opening Questions

Tuesday, November 27:

Which has more momentum - a supertanker tied to a dock or a falling raindrop? (p. 235, #8)

Wednesday, November 28:

Egg A is thrown into a blanket with a speed of 30 m/s. Egg A slows down to a stop without breaking. Egg B - an identical egg - is thrown with the same speed of 30 m/s at a wall. Egg B again slows down to a stop and breaks.

1. In which case did the egg encounter the greatest momentum change?

Egg A or Egg B or Both the same

2. In which case did the egg encounter the greatest impulse?

Egg A or Egg B or Both the same

3. In which case did the egg encounter the greatest force?

Egg A or Egg B   or Both the same

Thursday, November 29:

Consider the diagram at the right for the next three questions. The diagram depicts Before and After velocities of an 800-kg car in two different collisions with a wall. In case A, the car rebounds upon collision. In case B, the car hits the wall, crumples up and stops. Assume that the collision time for each collision are the same.

1. In which case does the car experience the greatest momentum change?

 a. Case A b. Case B c. Both the same d. Insufficient information

2. In which case does the car experience the greatest impulse?

 a. Case A b. Case B c. Both the same d. Insufficient information

3. The impulse encountered by the 800-kg car in case A has a magnitude of ___ N.

 a. 0 b. 800 c. 3200 d. 4000 e. 7200 f. Not enough information to determine.

Monday, December 3:

Jocko the clown, who has a mass of 60.0 kg and stands at rest on the ice, catches a 15.0-kg ball that is thrown to him at 20.0 km/hr. Jocko catches the ball and slides across the ice after the "collision". With what speed does Jocko (and the ball) move across the ice after the collision?

Organize your work and show a clear solution to the problem. Accompany your answer by appropriate units.

Tuesday, December 4:

A 1.0-kg cart is rolling along at 60 cm/s. It collides inelastically with a 3.0-kg cart. The two carts roll together as a single object after the collision. Determine their velocity.

Wednesday, December 5:

During a space walk, the tether connecting an astronaut to the spaceship breaks. Using a gas pistol, the astronaut manages to get back to the ship. Use the language of the impulse-momentum theorem and a diagram to explain why this method was effective. (p. 251, #50)

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