JeydinNewWon
Member
- Joined
- Oct 28, 2017
- Messages
- 49
- Gender
- Male
- HSC
- 2020
For question 20, there has been disputes over where it is A) or D). But I think I have a definitive case for why it is, in fact, A. When the ball undergoes a projectile-ish motion with the semi-circular ramp, it has both horizontal and vertical velocity components, right?
However! the centripetal force has a velocity component that is PERPENDICULAR to it. Considering the centripetal force is the Normal, this means the horizontal velocity component of the "projectile path" must be the velocity in the centripetal force, hence the centripetal force must be constant.
Also, remember, the centripetal force cannot have a velocity that is not constant--I don't think that makes sense.
So I'm a bit confused as to why MATRIX has set Q20 as D).
However! the centripetal force has a velocity component that is PERPENDICULAR to it. Considering the centripetal force is the Normal, this means the horizontal velocity component of the "projectile path" must be the velocity in the centripetal force, hence the centripetal force must be constant.
Also, remember, the centripetal force cannot have a velocity that is not constant--I don't think that makes sense.
So I'm a bit confused as to why MATRIX has set Q20 as D).