Physics
joeyb
14

30 POINTS!!!! You're on a skateboard, moving very fast but at a constant speed. Are you accelerating? Explain. Lara Claims that if an object is accelerating, it must be moving. She also claims that if an object is not accelerating, it must be at rest. Is lara correct? Explain. Is a dog chasing it's tail accelerating? Explain. Which one is accelerating? An airplane moving at a constant speed of 500 miles per hour in a straight line A race car rounding a corner at a constant speed of 200 miles per hour.

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(2) Answers
Sarita783

1.Yes beacause you are going fast but at a constant speed so yes. 2. Sara is correct you do need to be moving to accelerate so her answer is correct. 3. Yes because first of all its moving just like Sara said and yes because the dog will go faster over time. 4. The car is accelerating because the airplane is moving and so is the car though the plane is going in a straight line and the race car is rounding a. Corner at 200 miles an Hr. Hoped it helped.

BettieZumbrunnen

Here's the Rule:                "Acceleration" means any change in speed or direction . . .                 speeding up, slowing down, or turning. With just that rule, we can answer everything in this question. You're on a skateboard, moving very fast but at a constant speed. We don't know whether you're turning or not.  If you're turning, then you're accelerating.  If you're not, then you're not. Lara Claims that if an object is accelerating, it must be moving. That's a reasonable claim.  If the object is accelerating, then either its speed or direction is changing.  It has to be moving to do either one. Lara also claims that if an object is not accelerating, it must be at rest.  This one is NOT a reasonable claim.  "Not accelerating" only means that its speed and direction are not changing.  As long as it's moving at a steady speed in a straight line, it's not accelerating. In order to chase its tail, a dog has to run in a circle.  When he does that, his direction is constantly changing.  That's acceleration. An airplane moving at a constant speed of 500 miles per hour in a straight line is not accelerating, because neither its speed nor its direction is changing. A race car rounding a corner at a constant speed of 200 miles per hour is accelerating, because its direction is changing, and that's one kind of acceleration. I think we also need to mention that 'acceleration' does NOT mean 'speeding up'.  Yes, that's one kind of acceleration, but so are slowing down and following a curve at constant speed.

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