Momentum and Force | Physics with Professor Matt Anderson | M9-02
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- Опубликовано: 6 авг 2024
- Momentum has units of kg-m/s.
Force has units of kg-m/s^2.
These are really close to each other. There must be some relationship between the two. Let's hope so.
Physics with Professor Matt Anderson
Amazing video professor Anderson! The visual demonstrations make it super engaging. I have one question, when does impulse/change in momentum come into play? Because if we draw a force diagram with the dotted lines, doesn’t basically every situation include external forces such as gravity or friction? So isn’t change in momentum not possible?
Thank you so much for these awesome videos by the way. I’ve been watching your playlists in preparation of my physics exam and you make things so much clearer.
(Edit: sorry if this comment landed on a wrong video topic, the playlist feature automatically skips to another video even when writing comments)
Excellent point! Impulse refers to a force acting over some amount of time which leads to an object's change in momentum. Specifically, you have to look at the net force. Namely, if you have a hockey puck on ice that is hit by a stick, there are three forces that act on it: the stick, gravity, and the normal force from the ice. In that case, the stick imparts a force over some time which leads to a change in the puck's momentum. Gravity is exactly equal and opposite to the normal force from the ice, thus these vertical forces cancel out.
Cheers,
Dr. A
@@yoprofmatt thanks so much for your input! My physics professor never went into the other forces and explained how they don’t contribute to the impulse, which I didn’t understand why, but reading your comment that now makes sense. Also, thanks to you professor Anderson, I got a 93% on my last midterm exam! Excellent teaching you explain things so well.
What does dp or dt means does it mean delta momentum and delta time respectively ?
Your instructions are a bit confusing because when F is a vector you label it with an arrow on top which I understand perfectly but then when you tell us that F in not a vector and yet you continue to label it with an arrow on top as if it were a vector I get confused. Am I missing something here?