Lesson 10 Chapter 4

Force and motion
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Slide 1: Slide
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This lesson contains 22 slides, with text slides and 1 video.

time-iconLesson duration is: 45 min

Items in this lesson

Force and motion

Slide 1 - Slide

This lesson
  • Classical mechanics
  • Distance time graphs
  • Speed time graphs
  • Key formula's
  • Quantities and units exercise
  • Practice exercise

Slide 2 - Slide

Slide 3 - Video

Distance time graphs

Slide 4 - Slide

Shows:
  • The distance traveled
  • How much time this took
  •  How this distance was traveled

Slide 5 - Slide


Which of the two is faster?
  •  The gradient of the slope shows the speed of a movement
  •  blue is faster

Slide 6 - Slide

A
B

What happens in segments 
A & B?

Slide 7 - Slide

What kind of movement does each graph show?

Slide 8 - Slide

A: Constant speed

Slide 9 - Slide

B: Constant speed – In the other direction

Slide 10 - Slide

C: Stationary

Slide 11 - Slide

D: Acceleration

Slide 12 - Slide

E: Decceleration

Slide 13 - Slide

Speed-time graphs
Shows:
  • the speed something is traveling it.
  • The gradient of the graph shows the acceleration.
  • The area under the graph gives you the distance covered.

Slide 14 - Slide

Lesson 10 Chapter 4

Slide 15 - Slide

Key formula's for force and movement.
v=td
a=tvfvi
F=ma
W=fs
Speed
acceleration
Newtons second law of motion
Work

Slide 16 - Slide

Key formula's for force and movement.
v=td
a=tvfvi
F=ma
W=fs
Speed
acceleration
Newtons second law of motion
Work

Slide 17 - Slide

Slide 18 - Slide

physical quanitity
Symbol for the physical quantity
unit
symbol for unit
distance
seconds
meter/second
Δv
accelration
kg
F
displacement
Work

Slide 19 - Slide

physical quanitity
Symbol for the physical quantity
unit
symbol for unit
distance
d
meters
m
time
t
seconds
s
speed
v
meter/second
m/s
change in speed
Δv
meter/second
m/s
accelration
a
meter/second squared
m/s2
mass
m
kilogram
kg
force
F
Newton
N
displacement
s
meter
m
Work
W
Newton- meter
Nm

Slide 20 - Slide

Slide 21 - Slide

Practice problem
A professional cyclist with a mass of 85 kg goes from cycling at a regular speed to sprinting. A trainer is measuring their speed. At moment 1 they're cycling at a speed of 8.8 m/s. at moment 2, 7.6 seconds later they're cycling at a speed of 11.9 m/s.

The magnitude of the combined resistive forces of friction and air resistance during this acceleration have a magnitude of 41 Newton. Calculate the magnitude of the foward force the cyclist applies by paddling to oppose these resistive forces



Slide 22 - Slide