intro

Motion

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2761

Mdcl1

Mdcl!

2315

2761

Mdcl1

Mdcl!

Intro

• Written Quiz

• More on proportionality

• Motion Diagrams in 1-D

General Quiz rules:

•Start when you are told to

•Stop writing as soon as you are told to

•Make sure that the TA can figure out which answer you circled

•Turn your paper over as soon as you are finished

•If you are not finished, look ONLY at your own paper

PRQ Rules

• You have 10 minutes

• I will give you a 30 second warning

• Please be sure to include your name AND student number!

This Quiz:

Quiz Answers

Proportionality

If x t2 x = C t2

Some constant

You can use initial conditions to find the value of the constant ‘C’. Once you do, you can use

the equation to predict future results.

- another way

QQ3 Prop

Worked Example

A spring compressed by a force of 5N is compressed by 10cm. If a force of 20N is used, how far would the spring compress, given that for a simple spring: F x, where F is the force and x the compression.

(A) 5 cm

(B) 10 cm

(C) 20 cm

(D) 30 cm

(E) 40 cm

Motion Diagrams

• Motions Diagrams help give information about position as a function of time

• The positions in a Motion Diagram are always shown at equal time intervals

Like Movie Frames

But Overlaid

Like Movie Frames

Constant Velocity Case:

a= ?

t

x

Demo

Extra QQ

Quick Quiz 5X - difficult

Draw a motion diagram for a bouncing ball. Start the diagram when the ball is released, and end the diagram when it gets back to the top of its bounce.

Get TAs to assist with the physics

Get TAs to assist with the physics

Do for next class:

• Read: sections 1.3 pay special attention to • Other preparation: WebCT Vectors/Scalars forum

r

Make a discussion thread that lets them list all possible vectors and scalars. Tell them that there will be a quiz question on identifying.

Make a discussion thread that lets them list all possible vectors and scalars. Tell them that there will be a quiz question on identifying.