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Lesson 12 Chapter 4
Force and motion
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Slide 1:
Diapositive
Physics
Middelbare school
vwo
Leerjaar 3
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Force and motion
Slide 1 - Diapositive
Work
Slide 2 - Diapositive
Work
a measure of how much energy a force transferred to an object.
Slide 3 - Diapositive
Work
W
=
F
⋅
s
a measure of how much energy a force transferred to an object.
Slide 4 - Diapositive
Work
W
=
F
⋅
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 - Diapositive
Work
W
=
F
⋅
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 - Diapositive
Work & Energy
Slide 7 - Diapositive
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 - Diapositive
Work and energy
η
=
E
t
o
t
E
u
s
e
d
⋅
1
0
0
E
u
s
e
d
=
w
o
r
k
Slide 9 - Diapositive
Work and energy
η
=
E
t
o
t
E
u
s
e
d
⋅
1
0
0
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 - Diapositive
Do exercise 7 and 8
From section 4.3
To apply this new material
Slide 11 - Diapositive
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
⋅
s
η
=
E
t
o
t
E
u
s
e
d
⋅
1
0
0
E
u
s
e
d
=
w
o
r
k
Unit of work: Newton-meter (Nm)
1 Newton-meter (Nm) = 1 Joule (J)
Slide 12 - Diapositive
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.
A
B
C
D
Slide 13 - Diapositive
Acceleration
a
=
Δ
t
Δ
v
Slide 14 - Diapositive
Acceleration
a
=
Δ
t
Δ
v
a
=
Δ
t
v
f
−
v
i
Slide 15 - Diapositive
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 - Diapositive
a
=
Δ
t
v
f
−
v
i
Δ
t
=
a
v
f
−
v
i
v
i
=
v
f
−
(
a
⋅
t
)
v
f
=
(
a
⋅
t
)
−
v
i
Slide 17 - Diapositive
a
=
Δ
t
v
f
−
v
i
Δ
t
=
a
v
f
−
v
i
v
i
=
v
f
−
(
a
⋅
t
)
v
f
=
(
a
⋅
t
)
−
v
i
Slide 18 - Diapositive
a
=
Δ
t
v
f
−
v
i
Δ
t
=
a
v
f
−
v
i
v
i
=
v
f
−
(
a
⋅
t
)
v
f
=
(
a
⋅
t
)
−
v
i
Slide 19 - Diapositive
a
=
Δ
t
v
f
−
v
i
Δ
t
=
a
v
f
−
v
i
v
i
=
v
f
−
(
a
⋅
t
)
v
f
=
(
a
⋅
t
)
−
v
i
Slide 20 - Diapositive
Study the concept of inertia
Get savvy with the Newtons second law
F
r
e
s
=
m
⋅
a
Slide 21 - Diapositive
Study the concept of inertia
Get savvy with the Newtons second law
F
r
e
s
=
m
⋅
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)
Slide 22 - Diapositive
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La durée de la leçon est: 45 minLa durée de la leçon est: 45 min
