Equations of Motion Explantion

7/30/2019 Equations of Motion Explantion

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The Understanding Physics Group


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Requirements

Have an interest in science or at least thissession.

Stay motivated, even when it's difficult.

Bring highlighters, colour pens and flash drives ifyou want the slideshows.

Ask questions.

Help and be helped; we are a group of non-

judgement and understanding.


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The Cycle

5th of Feb: The first Grade 12 Physics Cycle

Apparently:

Grade 11: Equations of Motion

Grade 12: Motion in Two Dimensions

There are 11 days until our physics cycle.


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Equations of Motion: Recap

This section falls into Motion in Two Dimensionsbecause these Equations of Motion describe the

problem, in notation that can be solved.

Remember: almost all of these equations are

vectors (deal with magnitude and direction).

You need to decide which direction will be the

positive and work out the equation accordingly.


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Vectors: Recap

For example: If you take left as positive, andyour answer comes out as a negative, the

direction andthe sign have to change i.e.

- answer left + answer right


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Equations of Motion: Recap

Vi = initial velocity (ms-1) at t= 0 s

Vf= final velocity (ms-1) at t

x/y = vertical displacement (m)

t= time (s) t= time interval/change in time (s)

g = acceleration due to gravity (ms-2)


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Motion In Two Dimensions


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Motion in Two Dimensions

Introduction

We are going to look at momentum in twodimensions.

In Grade 10:

Free fall motion with objects at g [9,8 (ms-1) ]

In Grade 11:

Conservation of momentum.

In Grade 12:

Application of free fall motion and momentumconservation

in two dimensions.


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Terms In This Section

Momentum: Theproductof a bodys mass and itsvelocity.

(kg)(ms-1) = kgms-1 is the unit momentum has.

It is a vector quantity.

p = mv is a common equaition in working out

momentum (p)

Conservation of Momentum: A law

Statement: The principle of conservation of

momentum states that in an isolated system, the

total momentum remains constant.

Projectile Motion: The motion of objects that are

thrown upwards and then fall back to Earth.


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Vertical Projectile Motion

We will only consider the situation where theobject is thrown straight upwards and then falls

straight downwards.

There will be no horizontal displacement of the

object, only a vertical displacement.


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Motion in a Gravitational Field

An object always experiences the Earthsgravitation field, which causes it to go

downwards, whether its going upwards or

downwards.


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Equations of Motion Explantion

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Transcript of Equations of Motion Explantion