# What is the relation of sinθ and time in projectile motion with angle

1. Apr 12, 2013

### xunok123

1. The problem statement, all variables and given/known data
I am wondering what is the relation of sinθ & time of flight in projectile motion with angle.
(under the case of same velocity)
Is the graph of this in a parabola shape??

2. Relevant equations
t = (2u sinθ) / g
(u in constant)

3. The attempt at a solution
would it be correct that sinθ ∝ time of flight ?

would the relation be affected after the angle of projection is lager than 45?

This puzzles me a lot...~_~

2. Apr 12, 2013

### Andrew Mason

Welcome to PF!

If you want to plot time of flight vs. angle I would put θ on the x axis and t on the y axis. The graph would be a sine curve, not a parabola. It is similar in appearance to a parabola, though. There is no change in the relation at θ=45° .

The range of θ is 0 → π (180°) and reaches a maximum at θ = π/2 (90°).

AM

3. Apr 12, 2013

### xunok123

HI Manson! Thank you so much for your answer@@!! It's a big surprise for me!!
would u mind have a little more explanation on this phenomenon??
I find it so interesting that the graph would appear as a sine curve.

Last edited: Apr 12, 2013
4. Apr 12, 2013

### cepheid

Staff Emeritus
Why does it surprise you so much when you have an equation right in your original post that says t = (some stuff)*sin(theta) ?

Andrew Mason: didn't the OP want the relation between t and sin(theta), not the relation between t and theta? The former would be linear.