Projectile Motion Practical (1 Viewer)

[zenger69]

For physics task, I've got to investigate something regarding Projectile Motion.

The problem is I can't think of anything to investigate.

Can anyone tell me a practical regarding Projectile Motion and I have to investigate it.

Thanks

 

[helper]

Is there any other guidelines?

Make a little catapult that fires paper pellets or polystyrene balls.
Look at the range of your catapult for your dependent variable.
For your independent variable: Angle of elevation or force or projectile size or projectile shape etc.
Remember to keep everything else constant except for the two variables you chose.

 

[zenger69]

Ok. But is there anything like rolling a ball down a hill. Is that projectile motion?

 

[Constip8edSkunk]

No. you can roll a ball off the edge of a table of something, then it is projectile motion once it leaves the edge, but if its just down a hill and nothing else then it isnt.

 

[helper]

Any motion of an object through air is projectile motion.

 

[SarahMary]

we did a prac with a golf ball where we threw it up in the air and rolled it off the edge of a table, and took stroboscopic photographs of it every 1/10 of a second, which showed us it's trajectory etc.

 

[zenger69]

Ok. It's just I don't have very sophisticated equipment. Whats the most basic practical.

All it says is to

Plan, choose equipment or resources for and perform two first-hand investigations of projectile motion. For each investigation, you must choose two variables. Note: one must be an independent variable and the other will be the dependent variable.

 

[SarahMary]

well, for one prac, you could roll objects of different masses (independent variable) off a desk, seeing which would hit the ground first. then repeat it at a different height (dependent variable) with the same balls, timing how long it takes. Obviously you repeat each a few times, and average them to eliminate human error...

 

[helper]

Use your idea of rolling a ball down a slope. Have it then roll along a horizontal surface, like a table top, and then off the edge.
Measure range.
Vary starting height to vary initial velocity.

Look at relationship between initial velocity and range.
Control everything else.

 

[zenger69]

Ok.

So if I roll different balls off a table.

Which of the equations could I prove is true.

v=u+at
V2=u2+2as
s=u2+1/2at2

 

[helper]

Firstly you will have to support one of the equations in one dimension, horizontal and vertical.
The easiest is the last one.
Explain why height can be used to represent a change in initial velocity.
So looking at horizontal range you can show the last equation if you type it correct.

Showing there is no acceleration in the horizontal direction.

 

[aim54x]

look in ur txt book it will have something otherwise the ball and the table will work. from ur phrasin u can look at gallileo. he did a lot of work with projectiles

 

[zenger69]

I did a practical proving S=ut whether the range was dependent on the initial velocity.

Now the teacher says I have to do another one.

I'm doing as much research as I can but I can't seem to find any experiments or anything I can investigate.

 

[Jezzabelle]

Any motion of an object through air is projectile motion.

any object of mass launched in the air that has only the force of gravity acting on it once in the air, is a projectile (neglecting air resistance)

 

[jumb]

It's not really air...

 

[zenger69]

Is there anything like inverse proportional equations I can investigate.

According to my research

range^2 = (4xh) H

where H is height to ground

where h is height up slope

please help.

I'm really stuck for ideas.

 

[n00sey]

hey ji ji!! ^_^

 

[eleco]

lol, drive a car off a 20m cliff at 160ms-1, and predict where it would land

 

[Xayma]

Anything down a ramp off a table is valid, change the slope or length, know the angle it is at, and repeat. Measure range, time etc (from table edge)

 

[zenger69]

OMG Denise The Penis is a nightmare. RAAAAAAAAAAARRRRRRRRRRR