wheels and distance

7/23/2019 Wheels and Distance

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Wheels and DistanceIntroductory Presentation


2/21

Opening Activity

In Full Speed Ahead we made our robot moveforward with the program below.


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Opening Activity

1. How far did your robot move forward?

In this program

!. "hat affe#ted the distan#e it moved?

$. How #ould you get it to move a longer distan#e?

A shorter distan#e? An e%a#t distan#e you want?


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Opening Activity

&any things affe#ted how far your robot traveled.

' (he number of degrees your "ait For blo#)

is set to wait for

'(he si*e of your tires


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Wheels and Distance

In this a#tivity we+re going to program ourrobot to move an e%a#t distan#e.

(o do so we must understand a few things

about #ir#les.

S(A,( FI-ISH


6/21

Review

et+s start with the basi#s.Answer the following

1. "hat is a radius of a #ir#le?

!. "hat is a diameter of a #ir#le?

$. "hat is the formula for the

#ir#umferen#e of a #ir#le?

(he distan#e from the

#enter to the outside of

a #ir#le.

(he distan#e/ through a

#ir#le+s #enter/ from one

edge to another.

0ir#umferen#e

diameter 2

r

d


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Preview

"ith our )nowledge of #ir#umferen#e/ we

#an start figuring out how to #ontrol the

distan#e our robot goes.


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Preview

First/ we need to understand that the

#ir#umferen#e of a #ir#le is really 3ust a line

#urled around a #enter point.


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Review

From this/ we )now that the #ir#umferen#e of a

#ir#le and the length of the line it rolls out are

e4ual in length. Finish the following

d 50ir#umferen#e 5 2

ength of ine

So we )now that6

5 2


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Preview

et+s try a few more. Finish this #hart

ength of line 0ir#umferen#e

1 meter

! meters

7 meters

1 meter

! meters

7 meters


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Preview

8redi#t what would happen if we were to #hangethe number of rotations that the wheel ma)es?

9r #hange the diameter of the wheel?

9n#e you have #ompleted the

a#tivity #he#) your predi#tion


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Preview

In the meantime/ let+s review a few more topi#s

that you will need to su##essfully #omplete the

"heels and :istan#e Investigation.


13/21

Review: Average

(o find the averageof a #olle#tion of

measurements

'Add all of your measurements together

':ivide by the number of measurements

Average &easurement 1 ; &easurement ! ; &easurement $

$


14/21

Review: Average

Suppose your robot moved forward three times

with distan#es of meters. "hat is

the average distan#e it moved forward?

Average ;

of measurements

&easurement 1 &easurement ! &easurement $;< = 1>

$

7 meters


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(here are $=>@ in one full rotation of a wheel

Review: Degrees

>@

>@

1B>@

!7>@

$=>@


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Review: Degrees

If there are $=>in one rotation of a wheel/

how many degrees are there in two rotations?

Answer 7!>

7!>@ ! rotations 2 $=>

Co to the ne%t page for more pra#ti#eD


17/21

0omplete the following #hart to get some pra#ti#e

of :egrees 9f ,otations

1 rot.

$ rot.

1.< rot.

$=>@

1>B>@

@

Review: Degrees


18/21

Review

Eeep the following in mind as you #omplete

the "heels and :istan#e Investigation

'0ir#umferen#e the length of line a #ir#le rolls out

'0ir#umferen#e diameter 2

'Average sum of measurements

number of measurements

'(here are $=>@ in one rotation of a #ir#le


19/21

Review: Scientific Inquiry

Scientific Inquiry

(his is the pro#ess by whi#h

people as) 4uestions/ and

see) out answers to their4uestions through the use of

e%periments and s#ientifi#

)nowledge.


20/21

Review: Scientific Inquiry

ypothesis

A )ey element to S#ientifi# In4uiry is the

s#ientistGs hypothesis. A hypothesis is an

edu#ated guess #on#erning the out#ome

of the in4uiry pro#ess and the e%periments

#ondu#ted within.


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-ow you have the ne#essary )nowledge to getstarted in the "heels and :istan#e Investigation.

!ood "uc#$

wheels and distance

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