Lesson 12 Chapter 4

Force and motion

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This lesson contains 22 slides, with text slides.

Lesson duration is: 45 min

Items in this lesson

Force and motion

Slide 1 - Slide

Work

Slide 2 - Slide

Work

a measure of how much energy a force transferred to an object.

Slide 3 - Slide

Work

W = F \cdot s

a measure of how much energy a force transferred to an object.

Slide 4 - Slide

Work

W = F \cdot s

a measure of how much energy a force transferred to an object.

Quantity

Unit

work (W)

Newton-meter (Nm)

Force (F)

Newton (N)

distance covered (S)

meters (m)

Slide 5 - Slide

Work

W = F \cdot s

a measure of how much energy a force transferred to an object.

Quantity

Unit

work (W)

Newton-meter (Nm)

Force (F)

Newton (N)

distance covered (S)

meters (m)

A force that causes an object to move is called a motive force

Slide 6 - Slide

Work & Energy

Slide 7 - Slide

Work & Energy

a measure of how much energy a force transferred to an object.

1 Unit of work = 1 unit of energy

1 Newton-meter (Nm) = 1 Joule (J)

Slide 8 - Slide

Work and energy

η = \frac{​ E ^{​ u s e d ​ ​} ​ ​}{​ E ^{​ t o t ​ ​} ​} \cdot 100

E^{​ u s e d ​ ​} = w o r k

Slide 9 - Slide

Work and energy

η = \frac{​ E ^{​ u s e d ​ ​} ​ ​}{​ E ^{​ t o t ​ ​} ​} \cdot 100

E^{​ u s e d ​ ​} = w o r k

Example

The work done by the force generated by a car engine is equal to the useful energy generated by that car enginge.

Slide 10 - Slide

Do exercise 7 and 8

From section 4.3

To apply this new material

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Do exercise 7 and 8 From section 4.3

To apply this new material

Work a measure of how much energy a force transferred to an object.

W = F \cdot s

η = \frac{​ E ^{​ u s e d ​ ​} ​ ​}{​ E ^{​ t o t ​ ​} ​} \cdot 100

E^{​ u s e d ​ ​} = w o r k

Unit of work: Newton-meter (Nm)

1 Newton-meter (Nm) = 1 Joule (J)

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Practice problem

1) In which segment does the greatest acceleration take place?

2) Calculate is the acceleration in segment B?

3) Calculate the distance covered.

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Acceleration

a = \frac{​ Δ v ​ ​}{​ Δ t ​}

Slide 14 - Slide

Acceleration

a = \frac{​ Δ v ​ ​}{​ Δ t ​}

a = \frac{​ v ^{​ f ​ ​} - v ^{​ i ​ ​} ​ ​}{​ Δ t ​}

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imagine a rollercoaster ride with the following start.

You sit down

35 seconds later the ride starts to move. Which starts with being pulled up a slope at a steady speed of 2.2 m/s.

now 55 seconds after sitting down you reach the top of the slope and get dropped down causing the speed to increase tremendously.

a moment later 61 seconds after sitting down you reach the bottom of the drop with a tremendous speed of 31 m/s.

Calculate the the acceleration during the drop.

Slide 16 - Slide

a = \frac{​ v ^{​ f ​ ​} - v ^{​ i ​ ​} ​ ​}{​ Δ t ​}

Δ t = \frac{​ v ^{​ f ​ ​} - v ^{​ i ​ ​} ​ ​}{​ a ​}

v^{​ i ​ ​} = v^{​ f ​ ​} - (a \cdot t)

v^{​ f ​ ​} = (a \cdot t) - v^{​ i ​ ​}

Slide 17 - Slide

a = \frac{​ v ^{​ f ​ ​} - v ^{​ i ​ ​} ​ ​}{​ Δ t ​}

Δ t = \frac{​ v ^{​ f ​ ​} - v ^{​ i ​ ​} ​ ​}{​ a ​}

v^{​ i ​ ​} = v^{​ f ​ ​} - (a \cdot t)

v^{​ f ​ ​} = (a \cdot t) - v^{​ i ​ ​}

Slide 18 - Slide

a = \frac{​ v ^{​ f ​ ​} - v ^{​ i ​ ​} ​ ​}{​ Δ t ​}

Δ t = \frac{​ v ^{​ f ​ ​} - v ^{​ i ​ ​} ​ ​}{​ a ​}

v^{​ i ​ ​} = v^{​ f ​ ​} - (a \cdot t)

v^{​ f ​ ​} = (a \cdot t) - v^{​ i ​ ​}

Slide 19 - Slide

a = \frac{​ v ^{​ f ​ ​} - v ^{​ i ​ ​} ​ ​}{​ Δ t ​}

Δ t = \frac{​ v ^{​ f ​ ​} - v ^{​ i ​ ​} ​ ​}{​ a ​}

v^{​ i ​ ​} = v^{​ f ​ ​} - (a \cdot t)

v^{​ f ​ ​} = (a \cdot t) - v^{​ i ​ ​}

Slide 20 - Slide

Study the concept of inertia

Get savvy with the Newtons second law

F^{​ r e s ​ ​} = m \cdot a

Slide 21 - Slide

Study the concept of inertia

Get savvy with the Newtons second law

F^{​ r e s ​ ​} = m \cdot a

know the meaning of its components
Be able to rearrange it
Understand what it means
Tip 1: look up some youtube videos
Tip 2: Do exercise from the book (answers will be provided)

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Lesson 12 Chapter 4

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