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Projectiles. About projectile motion To the tune: “The Old Folks at Home” by Stephen Foster C is a comfortable key to sing it in. Projectiles – verse 1. When a thing is thrown and it zips off It will chase a parabolic arc We can do this with a gun or ball

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Presentation Transcript
slide1

Projectiles

About projectile motion

To the tune: “The Old Folks at Home” by Stephen Foster

C is a comfortable key to sing it in

slide2

Projectiles – verse 1

When a thing is thrown and it zips off

It will chase a parabolic arc

We can do this with a gun or ball

Or even Fido’s stick when in the park

slide3

Projectiles - Chorus

Horizontally, its speed is set

Of acceleration that way, it is free

Vertically, everything that’s not held up

Accelerates to earth, with value “g”

slide4

Projectiles – verse 2

An object that’s not held up by anything

Will plunge to earth like concrete in free-fall

As well as that, in a horizontal sense

There is no force that pushes it at all

slide5

Projectiles - Chorus

Horizontally, its speed is set

Of acceleration that way, it is free

Vertically, everything that’s not held up

Accelerates to earth, with value “g”

slide6

Projectiles – verse 3

Projectiles are objects that are in the air

Free from almost all external force

We ignore all lift and thrust and drag but we

Must include the vector, weight, of course

slide7

Projectiles - Chorus

Horizontally, its speed is set

Of acceleration that way, it is free

Vertically, everything that’s not held up

Accelerates to earth, with value “g”

slide8

Projectiles – verse 4

To find the range of anything that’s thrown about

We need to find the time until it lands

The vertical velocity, when t is nought

Combined with “g” will put it in our hands

slide9

Projectiles - Chorus

Horizontally, its speed is set

Of acceleration that way, it is free

Vertically, everything that’s not held up

Accelerates to earth, with value “g”

slide10

Projectiles – verse 5

Finally, now we know our time of flight

And the constant horizontal speed

We can find the distance ‘til the object drops

And thus we then have all the stuff we need

slide11

Projectiles - Chorus

Horizontally, its speed is set

Of acceleration that way, it is free

Vertically, everything that’s not held up

Accelerates to earth, with value “g”

slide12

Projectiles – Chorus – last time

Horizontally, its speed is set

Of acceleration that way, it is free

Vertically, everything that’s not held up

Accelerates to earth, with value “g”

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