Period 9 Period 10
Dr Kirkpatrick
ACTION - REACTION PREFLIGHT

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The following three questions refer to the material you were to read in preparation for the lesson. Questions one and two require you to write a three or four sentence response. Number three is a multiple choice question. Click in the appropriate circle.

You may change your mind as often as you wish. When you are satisfied with your responses, click the SUBMIT button at the bottom of this page.


1.

Consider a hand holding a ball at rest. The ball weighs 10 N. The forces acting on the ball are the weight of the ball and the force of the hand on the ball. The forces acting on the hand are the weight of the hand and the force exerted by the ball on the hand.
A) How big is the reaction force associated with the weight of the ball? What object is responsible for that force?
B) How big is the force the ball exerts on the hand? How big is the reaction force associated with that force?

Now let the hand exert a 15 N force on the ball.
C) How big is the reaction force associated with the weight of the ball? What object is responsible for that force?
D) How big is the force the ball exerts on the hand? How big is the reaction force associated with that force?



2.

Suppose the astronaut working on the Hubble telescope got himself completely loose of the shuttle and threw away a 2 kg hammer at 2 m/s. Could the astronaut remain at rest? If not, how fast would he be moving? How could he stop himself from drifting away?



3.

A 500 g piece of clay hits a stone at 80 m/s and sticks to it. The clay momentum must change by

80 Ns

- 40 Ns

40 Ns

more data are needed to answer





honors extra

The space shuttle assembly on the launch pad has a mass of about 2 million kg. The exhaust velocity of the propellant gases is about 4000 m/s. The gases are streaming out of the nozzles at the rate of about 18,000 kg/s. Given this information, estimate the acceleration of the space shuttle assembly.




Below is a space for your thoughts, including general comments about today's assignment (what seemed impossible, what reading didn't make sense, what we should spend class time on, what was "cool", etc.):




You may change your mind as often as you wish. When you are satisfied with your responses, click the SUBMIT button.

I received no help from anyone on this assignment.

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