Lesson 4 — Balanced and unbalanced forces

Science period 1
Forces
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Science period 1
Forces

Slide 1 - Diapositive

Force what comes to mind?
Discuss for 2 minutes with your neighbour what you think this chapter will be about.
Class discussion

  • if an object is moving, a force acts on it

This lesson
Checking homework
Balanced and unbalanced forces
Resultant force
Worksheet

Slide 2 - Diapositive

Cet élément n'a pas d'instructions

Goals
  • Describe the effects of balanced forces on stationary and moving objects

  • Describe the effects of balanced forces on stationary and moving objects

  •  Be able to calculate resultant force

Slide 3 - Diapositive

Cet élément n'a pas d'instructions

Checking the homework
  • Use the answer sheet to check your answers

  • Any questions?

Slide 4 - Diapositive

Open the answers on another tab, and let the students check their answers them selves

Balanced forces

and
 
unbalanced forces

Slide 5 - Diapositive

Cet élément n'a pas d'instructions

Slide 6 - Diapositive

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Balanced or unbalanced?

Slide 7 - Diapositive

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Balanced or unbalanced?

Slide 8 - Diapositive

Cet élément n'a pas d'instructions

Slide 9 - Diapositive

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Balanced and unbalanced forces
  •  A pair of forces

  • Working in opposite directions

  • Or working in the same direction

Slide 10 - Diapositive

Cet élément n'a pas d'instructions

Slide 11 - Diapositive

Cet élément n'a pas d'instructions

Slide 12 - Diapositive

Cet élément n'a pas d'instructions

Resultant force
  •  Forces in the same direction add up
  • Forces in opposite directions cancel out

Slide 13 - Diapositive

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Resultant force?

Slide 14 - Diapositive

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Slide 15 - Diapositive

Cet élément n'a pas d'instructions

balanced forces
Unbalanced forces
stationary objects
Moving objects

Slide 16 - Diapositive

Cet élément n'a pas d'instructions

balanced forces
Unbalanced forces
stationary objects
remain stationary
Moving objects

Slide 17 - Diapositive

Cet élément n'a pas d'instructions

balanced forces
Unbalanced forces
stationary objects
remain stationary
gets forced into moving
Moving objects

Slide 18 - Diapositive

Cet élément n'a pas d'instructions

balanced forces
Unbalanced forces
stationary objects
remain stationary
gets forced into moving
Moving objects
Move at a steady speed

Slide 19 - Diapositive

Cet élément n'a pas d'instructions

balanced forces
Unbalanced forces
stationary objects
remain stationary
gets forced into moving
Moving objects
Move at a steady speed
They accelerate/ decelerate

Slide 20 - Diapositive

Cet élément n'a pas d'instructions

Worksheet balanced and unbalanced forces


If you're done, start working on the workbook exercises of paragraph 1.2

Slide 21 - Diapositive

Cet élément n'a pas d'instructions

Goals
  • Describe the effects of balanced forces on stationary and moving objects

  • Describe the effects of balanced forces on stationary and moving objects

  •  Be able to calculate resultant force

Slide 22 - Diapositive

Cet élément n'a pas d'instructions