# Topic 3.3: Acceleration

Topic 3.3
Acceleration
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Slide 1: Tekstslide
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In deze les zitten 36 slides, met interactieve quizzen, tekstslides en 1 video.

## Onderdelen in deze les

Topic 3.3
Acceleration

#### Slide 1 -Tekstslide

The unit for force is:

A
N
B
F
C
kg
D
Nm

#### Slide 2 -Quizvraag

There are 2 Forces working on an object. When is the resulting force zero?
A
When the forces are working in the same direction
B
When the forces are opposites
C
When the forces have te same magnitude
D
When they are the same magnitude and opposite to each other

#### Slide 3 -Quizvraag

Dog A is pulling with a force of 60 N and dog B is pulling in the opposite direction with a force of 75 N
What is the resultant force?
A
15 Newton to dog A
B
75 Newton to dog B
C
60 Newton to dog A
D
15 Newton to dog B

#### Slide 4 -Quizvraag

The symbol for speed is
A
s
B
v
C
m/s
D
km/h

#### Slide 5 -Quizvraag

3.2 : Speed
The speed can be given in 2 different units
m/s  (meters per second)
km/h (kilometers per hour)

#### Slide 6 -Tekstslide

recap 3.2: Speed
Speed (velocity) is the distance you travel in a given time

v for velocity in [m/s or km/h]
s for distance in [m or km]
t for time in [s or h(our)]

#### Slide 7 -Tekstslide

time can be calculated with the following formula
A
t= v/s time = speed / distance
B
t = s/v time = distance /speed
C
t = s x v time = distance * speed
D
t = s + v time = distance + speed

#### Slide 8 -Quizvraag

Convert 100 km/h to m/s?
A
27,8 m/s
B
360 m/s
C
103,6 m/s
D
96,4 m/s

#### Slide 9 -Quizvraag

3.3 Acceleration
Learning goals
1. You can describe the concept of acceleration and understand which measurements and units are necessary to calculate it
2. i can create and interpret v,t-diagrams relating to an object's change in motion
3. i can use an object's resultant force to determine what type of motion it has

#### Slide 10 -Tekstslide

3.3 Acceleration
Acceleration is change in speed, so speeding up or slowing down, measured in meters per second squared (m/s2).

#### Slide 11 -Tekstslide

acceleration is an increase in speed
a is a positive number

#### Slide 12 -Tekstslide

a decrease in speed is called decelaration
a is a negative number

#### Slide 13 -Tekstslide

Johanie is at a traffic light. As soon as it hits green, he starts to speed up on his bike. He accelerates with 5 m/s2.
What is his speed after 4 seconds?

A
9 m/s
B
1 m/s
C
20 m/s
D
1,25 m/s

#### Slide 14 -Quizvraag

convert 18 m/s to km/h
A
14,4 km/h
B
65 km/h
C
5 km/h
D
21,6 km/h

#### Slide 15 -Quizvraag

3.3: acceleration

#### Slide 16 -Tekstslide

3.3: acceleration
acceleration is positive when speed increases
delta v = v(final) - v(initial)
delta v = 20 - 0 = 20 m/s (so it is positive)

a = 20/5 = 4 m/s2 (also positive)

#### Slide 17 -Tekstslide

3.3: acceleration
acceleration is negative when speed decreases
delta v = v(final) - v(initial)
delta v = 0 - 20 = -20 m/s (so it is negative)

a = -20/5 = -4 m/s2 (also negative)

#### Slide 18 -Tekstslide

The mass of Mohamed is 45 kg. What is his gravitational force, Fg
A
350 N
B
45 N
C
441 N
D
882 N

#### Slide 20 -Video

How far did this object travel after 16 seconds?
A
500 km
B
1000 km
C
0 km
D
300 km

#### Slide 21 -Quizvraag

I want to draw a force with a magnitude of 600 N.
The scale must be 1 cm = 60 N
How large should the arrow (vector) be?
A
2 cm
B
5 cm
C
10 cm
D
12 cm

#### Slide 22 -Quizvraag

3.3 acceleration
Moving at a constant speed gives me these 2 graphs
Notice that the first is an s,t-diagram,
The second one is a v,t-diagram

#### Slide 23 -Tekstslide

3.3 acceleration
Moving at a constant acceleration gives me these 2 graphs
Notice that the first is an s,t-diagram,
The second one is a v,t-diagram

#### Slide 24 -Tekstslide

3.3 acceleration
Moving at a constant negative acceleration gives me these 2 graphs
Notice that the first is an s,t-diagram,
The second one is a v,t-diagram

#### Slide 25 -Tekstslide

A car is accelerating for 8 seconds, increasing by 20 m/s every second. What is his final speed?
A
28 m/s
B
160 m/s
C
2,5 m/s
D
12 m/s

#### Slide 26 -Quizvraag

Homework
make exercises 22,23 and 24

Have a good time in Bath

#### Slide 27 -Tekstslide

3.3 acceleration
resultant force

The result of multiple forces

same direction ? add them up

opposite direction? subtract them

3.3 Acceleration

#### Slide 29 -Tekstslide

3.3 Acceleration
If the resultant force is 0 N, the object is not accelerating
The speed is constant

standing still is also a constant speed (0 m/s)

#### Slide 30 -Tekstslide

3.3 Acceleration
If the resultant force is + N, the object will accelerate
(+ means it is in the same direction as the movement)

#### Slide 31 -Tekstslide

3.3 Acceleration
If the resultant force is - N, the object will decelerate
(- means the resultant force is opposite to the direction of movement)

#### Slide 32 -Tekstslide

What kind of movement will happen in this situation?
A
constant speed to the left
B
constant speed to the right
C
acceleration to the left
D
acceleration to the right

#### Slide 33 -Quizvraag

What kind of movement wil happen here
A
constant speed downwards
B
constant speed upwards
C
deceleration downwards
D
deceleration upwards

#### Slide 34 -Quizvraag

On an object the following forces are acting:
50 N to the right
20 N upwards
75 N to the left
20 N downwards
What type of motion will happen?
A
acceleration upwards
B
acceleration to the right
C
acceleration downwards
D
acceleration to the left

#### Slide 35 -Quizvraag

3.3 Acceleration
Learning goals
1. You can describe the concept of acceleration and understand which measurements and units are necessary to calculate it
2. i can create and interpret v,t-diagrams relating to an object's change in motion
3. i can use an object's resultant force to determine what type of motion it has