Question

Could someone explain how to solve projectile motion problems?

Answer 1

Movement in the horizontal and vertical directions are independent of each other so you want to use sine and cosine to break up vectors into their components.

Answer 2

I don't get this concept at all

Answer 3

The problems related to this are had

Answer 4

Hard*

Answer 5

ok, so force is a vector. moving up does not affect moving right. so to calculate the direction moving right you use F cos theta.
For upward motion you use F sin theta

Answer 6

Is this high school level physics?

Answer 7

vectors? it's high school math. You're just applying it in physics. What grade are you in?

Answer 8

9

Answer 9

If you've taken calculus or are taking it, it would help immensely. if not, you'll get there

Answer 10

Ok can I ask a question from my physics book?

Answer 11

sure,

Answer 12

A bowling ball is moving at 10m/s when it rolls off the edge of a tall building. What is the ball'sspeed one second later?

Answer 13

19.8 m/s?

Answer 14

How did you calculate that?

Answer 15

\[v_f = v_i +at\]
a=9.8m/s^2

Answer 16

What are vf and vi in this equation?

Answer 17

initial and final velocity

Answer 18

So what do you use this formula for in physics

Answer 19

kinematics

Answer 20

Ok thanks

Answer 21

So how do u find the time?

Answer 22

it was given

Answer 23

Oh nvm

Answer 24

I get a different answer. Time is given in the problem. 1 sec

Answer 25

What answer did u get?

Answer 26

I got 19.8 m/s

Answer 27

Horizontal speed will stay constant because no acceleration is acting on it.

Answer 28

Right

Answer 29

Vertical velocity is what changes using the formula given earlier.

Answer 30

So what is the formula?

Answer 31

The initial velocity in the vertical direction is 0, acceleration is -9.8 m/s^2 and time is. 1.

Answer 32

It could be

Answer 33

So, the final velocity in the vertical direction is -9.8 m/s.

Answer 34

Is it ok if its negative?

Answer 35

Using the pythagorean theorem to find the resultant velocity gives 14 m/s.

Answer 36

Yes, negative just means downward.

Answer 37

Which 2 numbers did you use to find the resultant?

Answer 38

10 m/s and -9.8 m/s.

Answer 39

So which solution is right?

Answer 40

Have you studied vectors yet?

Answer 41

Yes

Answer 42

But I don't get them fully

Answer 43

Then, I think that my solution is probably the way you are supposed to work the problem.

Answer 44

I'm assuming 24 m/s? I haven't studied kinematics in a while

Answer 45

You can only use projectile motion equations in the horizontal and vertical directions separately.

Answer 46

Then connect them back together using right triangles.