Physics 1st Partial REPOSITION

Select the steps of THE SCIENTIFIC METHOD (2)

• explain the most fundamental features of various phenomena

• Interpret results, and revise the hypothesis if necessary.

• Select the topic

• Formulate and objectively test hypotheses by experiments.

What's the formula of displacement?

• ∆x = xi − xf

• ∆x = xf − xi

• ∆x = xi − xf²

• none.

What's the formula of Average Velocity?

• Vavg = Change in position / change in time = displacement / time interval

• Vavg = Change in time / change in position = time interval / displacement

• Vavg = Change in position / time interval = displacement /change in time

• Vavg = Displacement / change in time = Change in position / time interval

During a race on level ground, Andra runs with an average velocity of 8.02 m/s to the east. What is Andra’s displacement after 168 s?

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If Joe rides his bicycle in a straight line for 15 min with an average velocity of 12.5 km/h south, how far has he ridden?

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What is the total displacement from an object in which it's initial position was 34 cm and it's final is 89cm.

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A shuttle bus slows down with an average acceleration of 2.8 m/s2 . How long does it take the bus to slow from 5.0 m/s to a complete stop?

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A car traveling at 7.0 m/s accelerates uniformly at 2.5 m/s2 to reach a speed of 12.0 m/s. How long does it take for this acceleration to occur?

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Why is the frame of reference so important in physics?

• For specifying the precise location of objects in space and time.

• It's helpful to locate an specify object.

• Instead of using a frame of reference in physics we use an measurer.

• The change in position of an object

 $\frac{50km}{5hrs}\ -->\ \frac{m}{s}$  

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