# Topic 3.3: Acceleration

Topic 4
Acceleration
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Slide 1: Tekstslide
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In deze les zitten 46 slides, met interactieve quizzen en tekstslides.

## Onderdelen in deze les

Topic 4
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

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

#### Slide 6 -Tekstslide

recap 4.1: 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

4.2 Force, Mass and 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

4.2 Force, Mass and 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

Tugra 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

4.2 Force, Mass and Acceleration

#### Slide 16 -Tekstslide

4.2 Force, Mass and 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

4.2 Force, Mass and 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 Siem is 45 kg. What is his gravitational force, Fg
A
350 N
B
45 N
C
441 N
D
882 N

#### Slide 19 -Quizvraag

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

#### Slide 20 -Quizvraag

4.2 Force, Mass and 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 21 -Tekstslide

4.2 Force, Mass and 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 22 -Tekstslide

4.2 Force, Mass and 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 23 -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 24 -Quizvraag

4.2 Force, Mass and Acceleration
resultant force

The result of multiple forces

same direction ? add them up

opposite direction? subtract them

#### Slide 25 -Tekstslide

4.2 Force, Mass and Acceleration

#### Slide 26 -Tekstslide

4.2 Force, Mass and 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 27 -Tekstslide

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

#### Slide 28 -Tekstslide

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

#### Slide 29 -Tekstslide

4.2 Force, Mass and Acceleration
F = m.a

Force in N
mass in kg
a in m/s^2

#### Slide 30 -Tekstslide

How can we calculate mass when knowing acceleration and force?
A
m = F.a
B
m = F/a
C
m = F + a
D
m = a/F

#### Slide 31 -Quizvraag

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

#### Slide 32 -Quizvraag

4.2 Force, Mass and 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 37 -Tekstslide

|What will the formula for distance be when we know work and force?
A
W = f/s
B
s= W/F
C
s = F/W
D
W = F+s

#### Slide 43 -Tekstslide

What formulas from this chapter do you remember?

#### Slide 44 -Woordweb

a carengine has to do work to get it to move. If the resultant force on the car is 500 N, how much work must be done to get it to go 250 m?
A
2 J
B
125000 J
C
750 J
D
0,5 J

#### Slide 45 -Quizvraag

F=m x a
F = m x g
W = F x s
a = v/t
V=s/t
E= P x t
Work
Resultant force
Gravitiational force
acceleration
Velocity
Energy