Projectile Motion: Where will this ball hit a vertical wall?
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- เผยแพร่เมื่อ 26 ก.ค. 2020
- Algebra-Based Physics Final Exam
Question 3:
You have a ball launcher that shoots a 18 gram ball with an initial speed of 5 m/s. Suppose you place this launcher on the ground and aim at 55 degrees above the horizontal at a vertical wall that is 1.2 meters away. When the ball hits the wall, how high above the ground will it be?
Thank you!
3:49. do we always use the hypotenuse's velocity as the initial velocity, or is it depends on the question? if the question is the time taken to "travel horizontal distance", do we still use the hypotenuse's or the velocity in x direction?
It depends on the question. The most common way to present the initial launch is to give a magnitude and direction. You don't have to do it that way though.
Where did you find g=9.8? is that just a physics standard?
It's a physics standard. g is the local gravitational field. On the surface of the Earth, it has a value of 9.8 N/kg. We use this for the weight of an object as W = m*g. For an object with ONLY the gravitational force, it would have a vertical acceleration of g
Why there is no acceleration along x motion?
After the ball is launched, the only force is the downward pulling gravitational force. That means the force in the x-direction is zero and therefore the acceleration in the x-direction is also zero.
Ur going too fast. I have no idea what you are saying.
Sorry - I go fast for two reasons: 1) I get excited about physics. 2) I'm trying to keep the video length down to a reasonable value.
You might try changing the playback speed on TH-cam. That might help.
@@DotPhysics Okay. Thanks for responding!