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PHYS 131 - Review: Ch. 1 to 8 1

Midterm review

First, choose a team…

The Newtons

The Joules

The Watts

The Galileans

The Hookes

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25

55

67

43

1. The Newtons

2. The Joules

3. The Watts

4. The Galileans

5. The Hookes

PHYS 131 - Review: Ch. 1 to 8 2

Chapter 1: Preliminaries

• units

• significant figures, order of magnitude estimates

• dimensional analysis / sanity checks / diagrams

Chapter 2: 1-D Kinematics

• speed vs velocity / distance vs displacement

• average (speed/acceleration) vs instantaneous

• graphical approach to disp., vel., and acceleration.

• special case of motion at constant acceleration (eg. freefall):

v = v0+ at

vaver = (v + v0)/2

v2= v02+ 2a (x – x0)

x = x0+ v0t + ½at2

PHYS 131 Review: Chapters 1 – 8

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PHYS 131 - Review: Ch. 1 to 8 3

An acceleration vector:

Tells you how ...

Has a directio...

Points in the ...

Is parallel or...

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64

5

161

1. Tells you how fast an

object is moving

2. Has a direction that can be

determined from two

velocity vectors

3. Points in the direction of

motion

4. Is parallel or opposite to

the direction of motion

PHYS 131 - Review: Ch. 1 to 8 4

In 1-D motion, the slope at a point on a position-vs-time

graph of an object is

The object’s speed at...

The object’s average ...

The object’s instanta...

The object’s accelera...

The distance travelle...

12 15 12

215

1. The object’s speed at that

moment

2. The object’s average velocity

at that moment

3. The object’s instantaneous

velocity at that moment

4. The object’s acceleration at

that moment

5. The distance travelled by

the object to that point

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PHYS 131 - Review: Ch. 1 to 8 5

Chapter 3: Vectors

• vectors vs scalars

• vector components; unit vectors

Chapter 4: Motion in two dimensions

• Position and velocity vectors

• Derivatives by components

• 2-D motion at constant acceleration

• Projectile motion:

• parabolic shape

• range equation

• Uniform circular motion

• Tangential, radial accelerations

• Relative velocities (frames of reference)

v = v0+ at

vaver = (v + v0)/2

v2= v02+ 2a (x – x0)

x = x0+ v0t + ½at2

dproj = 2 (vy0vx0)/g

dproj = v2sin(2Θ)/g

a = v2/r

PHYS 131 - Review: Ch. 1 to 8 6

Which of the following is true?

A component of a vect..

A component of a vect..

A component of a vec...

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1. A component of a vector is

always larger than the

magnitude of the vector.

2. A component of a vector is

never larger than the

magnitude of the vector.

3. A component of a vector is

sometimes larger than, and

sometimes smaller than, the

magnitude of the vector.

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