Phy201
Your 'cq_1_18.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
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A child in a slowly moving car tosses a ball upward. It rises to a point below the roof of the car and falls back down, at which point the child catches it. During this time the car neither speeds up nor slows down, and does not change direction.
• What force(s) act on the ball between the instant of its release and the instant at which it is caught? You can ignore air resistance.
The ball is actually traveling the same speed as the car along with the added velocity of the toss then gravity takes effect and brings it down.
What happens to the speed of the ball between release and catch? Describe in some detail; a graph of speed vs. clock time would also be appropriate.
You mentioned gravity but did not indicate whether this is a force or not, or whether other forces might also be acting on the ball.
The ball would go up losing speed until it came down with the help of gravity slightly behind the point at which the top of its curve though in relative it would actually be much further because of the movement of the vehicle.
Describe the path of the ball as it would be observed by someone standing along the side of the road.
The ball would go up then back down as the car moved so it would appear to be going the same speed as the car along with the vertical acceleration.
This isn't bad but does not actually describe the path. What does the path of the ball look like?
How would the path differ if the child was coasting along on a bicycle? What if the kid didn't bother to catch the ball? (You know nothing about what happens after the ball makes contact with the ground, so there's no point in addressing anything that might happen after that point).
It depends on how high the kid is throwing the ball up if not to high it may hit himin the head if high enough he couldn’t catch it because it would be behind the bike
Why would the ball fall behind the bike? It might well do so, but the reason needs to be specified.
What if the child drops the ball from the (inside) roof of the car to the floor? For the interval between roof and floor, how will the speed of the ball change? What will be the acceleration of the ball? (You know nothing about what happens after the ball makes contact with the floor, so there's no point in addressing anything that might happen after that point).
The ball would accelerate vertically but the horizontal acceration would decrease becase of resistance.
By 'resistance' do you mean air resistance? If so, how would this be connected to the horizontal acceleration? If not, then what do you mean by 'resistance'?
• What if the child holds the ball out of an open window and drops it. If the ball is dense (e.g., a steel ball) and the car isn't moving very fast, air resistance will have little effect. Describe the motion of the ball as seen by the child. Describe the motion of the ball as seen by an observer by the side of the road. (You know nothing about what happens after the ball makes contact with the ground, so there's no point in addressing anything that might happen after that point).
The ball would fall nearly straight down except for the ball would fall back a few feet behind the car.
Does the horizontal velocity of the ball change significantly?
Does its vertical velocity change significantly?
What are the implications of your answers for the path of the ball?
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25min
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&#Your work looks very good. Let me know if you have any questions. &#