/u/datguy030's posts in /r/askscience

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Why does the air not escape from basketballs (orany sports ball for that matter, where there is an open air tube) or from bike tires (when the cap is removed)?

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According to Newton's 2nd Law, if I push an eraser across a table with the same force, it should keep accelerating. Why does it stay at constant speed though?

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How does gravity make things like the moon travel in a circle/ellipse around the Earth?

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For outlet plugs, why is there always a hole in each of the prongs?

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When a tow-truck pulls a car, the tow-truck exerts a force on the car, causing it to move. But (because of Newton's third law), what's the opposite and equal force in this?

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Why does banking a race car road prevent fast cars from flipping over (in terms of torque and centripetal force)

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(1) If cars had normal tires, would they be able to move on a frictionless surface? (2) Would it work the other way around (frictionless tires, normal surface)? (3) How about if the tires and surface were frictionless?

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Why does typing excessively lead to carpal-tunnels syndrome, while playing the piano, which has essentially the same movements, doesn't?

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What is the difference between Force and Pressure (preferably with examples)?

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Why do some devices (like a lightbulb) require a certain amount of Power, not Work?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Why does the air not escape from basketballs (orany sports ball for that matter, where there is an open air tube) or from bike tires (when the cap is removed)?	0
According to Newton's 2nd Law, if I push an eraser across a table with the same force, it should keep accelerating. Why does it stay at constant speed though?	0
How does gravity make things like the moon travel in a circle/ellipse around the Earth?	0
For outlet plugs, why is there always a hole in each of the prongs?	0
When a tow-truck pulls a car, the tow-truck exerts a force on the car, causing it to move. But (because of Newton's third law), what's the opposite and equal force in this?	0
Why does banking a race car road prevent fast cars from flipping over (in terms of torque and centripetal force)	0
(1) If cars had normal tires, would they be able to move on a frictionless surface? (2) Would it work the other way around (frictionless tires, normal surface)? (3) How about if the tires and surface were frictionless?	0
Why does typing excessively lead to carpal-tunnels syndrome, while playing the piano, which has essentially the same movements, doesn't?	0
What is the difference between Force and Pressure (preferably with examples)?	0
Why do some devices (like a lightbulb) require a certain amount of Power, not Work?	0