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5 Minute Class Starter Write this in your notes Describe the motion of a falling object. • Does it have a constant speed? • Does it have a constant acceleration?

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Page 1: 5 Minute Class Starter Write this in your notes Describe the motion of a falling object. Does it have a constant speed? Does it have a constant acceleration?

5 Minute Class StarterWrite this in your notes

Describe the motion of a falling object. • Does it have a

constant speed? • Does it have a

constant acceleration?

Page 2: 5 Minute Class Starter Write this in your notes Describe the motion of a falling object. Does it have a constant speed? Does it have a constant acceleration?

Physics 11Unit 1 Lesson 20

Star International AcademyMr. David Anderson

Page 3: 5 Minute Class Starter Write this in your notes Describe the motion of a falling object. Does it have a constant speed? Does it have a constant acceleration?

Today’s Agenda

1.Class Starter

2.Free Fall – free body diagram

3.Free Fall – mathematical formulas

Page 4: 5 Minute Class Starter Write this in your notes Describe the motion of a falling object. Does it have a constant speed? Does it have a constant acceleration?

2. Free Fall – Free Body Diagram

Page 5: 5 Minute Class Starter Write this in your notes Describe the motion of a falling object. Does it have a constant speed? Does it have a constant acceleration?

Free Body Force Diagram

What is a free body force diagram?

- A free body force diagram is a picture or a model showing the different forces acting on an object

Page 6: 5 Minute Class Starter Write this in your notes Describe the motion of a falling object. Does it have a constant speed? Does it have a constant acceleration?

Example: Pushing on a crate

Page 7: 5 Minute Class Starter Write this in your notes Describe the motion of a falling object. Does it have a constant speed? Does it have a constant acceleration?

Draw three free body diagrams

Beginning

of fall

Middleof fall

End of fall(no bounce)

Page 8: 5 Minute Class Starter Write this in your notes Describe the motion of a falling object. Does it have a constant speed? Does it have a constant acceleration?

Draw two free body diagrams

Sheet of paper

Balled up paper

Falling

Page 9: 5 Minute Class Starter Write this in your notes Describe the motion of a falling object. Does it have a constant speed? Does it have a constant acceleration?

Summary

Conclusion:

What forces are acting on a falling object?

Is a falling object accelerating? How do you know this?

Page 10: 5 Minute Class Starter Write this in your notes Describe the motion of a falling object. Does it have a constant speed? Does it have a constant acceleration?

PAUSE

Page 11: 5 Minute Class Starter Write this in your notes Describe the motion of a falling object. Does it have a constant speed? Does it have a constant acceleration?

Class Starter

Review the project description.

- Write down at least one question that you have about it.

Page 12: 5 Minute Class Starter Write this in your notes Describe the motion of a falling object. Does it have a constant speed? Does it have a constant acceleration?

3. Free Fall – Mathematical Model

Page 13: 5 Minute Class Starter Write this in your notes Describe the motion of a falling object. Does it have a constant speed? Does it have a constant acceleration?

Review of motion formulas

Velocity (speed) = change in position / change in time

a = d / t

Acceleration = change in velocity / change in time

a = v / t

Page 14: 5 Minute Class Starter Write this in your notes Describe the motion of a falling object. Does it have a constant speed? Does it have a constant acceleration?

Motion formula: constant speed

What is the acceleration?

a = 0

What is the velocity?

v = v0 (v0 = constant or initial velocity)

What is the position?

x = x0 + v0t

initialpositio

n

position change due to velocity

Bonus for Calculus students:

Start with the formula for position:

x = x0 + v0t

Differentiate implicitly with respect to time twice. Can you derive the other formulas?

Page 15: 5 Minute Class Starter Write this in your notes Describe the motion of a falling object. Does it have a constant speed? Does it have a constant acceleration?

Motion formula: constant acceleration

What is the acceleration?

a = a (a = constant acceleration)

What is the velocity?

v = v0 + at

What is the position?

x = x0 + v0t + ½at2

initialpositio

n

position change due to velocity

Bonus for Calculus students:

Start with the formula for position:

x = x0 + v0t + ½at2

Differentiate implicitly with respect to time twice. Can you derive the other formulas?

position change due to acceleration

Page 16: 5 Minute Class Starter Write this in your notes Describe the motion of a falling object. Does it have a constant speed? Does it have a constant acceleration?

Constant Acceleration Formula

x = x0 + v0t + ½at2

In math terms, what is the order of this formula?

If you graphed this formula, what is the shape of the graph?

Does this match your idea of free fall?

How does the formula change if the acceleration is zero?

Page 17: 5 Minute Class Starter Write this in your notes Describe the motion of a falling object. Does it have a constant speed? Does it have a constant acceleration?

Application to Projectile Motion

Page 18: 5 Minute Class Starter Write this in your notes Describe the motion of a falling object. Does it have a constant speed? Does it have a constant acceleration?

Projectile Motion

Projectile motion is a combination of motion types.

How does a projectile move in the horizontal (X) direction?

How does a projectile move in the vertical (Y) direction?


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