P8 - Forces

Independent Learning

Introduction

Objects sometimes accelerate when a force acts on them. Forces can be split into 2 groups, contact forces and non-contact forces. In this unit you will learn how the forces acting on an object affect its movement and the different ways these forces can be shown in a diagram. You will also study scalar and vector quantities and the difference between them. In addition to this you will find out what is meant by the “centre of mass” of an object and how to find this on regular and irregular shapes. Higher tier students will also find a resultant force using a parallelogram and resolve a resultant force into two components. Set one students will also study moments, levers and gears.

Specification links:

Task 1: Know

Task 1a: Use quizlet to help you learn the keywords and look cover, write check with the knowledge organiser and core questions to learn the key facts for this unit.

P8 Knowledge Organiser

Task 1b: listen to the podcast to get an overview of this unit

Set 1

Set 2

Set3

Learn

Task 2: Vectors and scalars

Task 2a: Watch the video and read through the Bitesize page

Task 2b: Read through the slides

Lesson 1 Scalars and Vectors - Default

Task 2c: Make notes that:

  • Define scalar, vector and magnitude.

  • Name 4 scalar quantities and 4 vector quantities

  • Explain how we can use arrows to represent vectors.

  • Complete the scale diagrams activity on slide 17

  • Explain the difference between distance and displacement and give an example.

  • Determine the scalars and vector quantities in this paragraph - Underline scalars and highlight vectors.

Task 2d: If you have a printer complete the worksheet

Task 2e: Complete the quiz

Task 3 - Forces between objects

Task 3a: Watch the videos.

Task 3b: Read through the slides and the BBC Bitesize page

Lesson 2 Forces between objects - Default

Task 3c: Make notes that:

  • List the things forces can do.

  • Name 3 contact forces and 3 non-contact forces.

  • Give Newton’s third law of motion

  • Define reaction force

  • Draw a plane and label all the action and reaction forces acting on it.

  • Complete the questions on slides 26, 27 and 28

Task 3d: Complete the BBC Bitesize forces quiz

Task 3e: Complete and self mark the exam questions

Task 4 - Resultant forces

Task 4a: Watch the video and read through the slides

Lesson 3 Resultant Forces - Default

Task 4b: Make notes that:

  • Define resultant force.

  • Define equilibrium.

  • Describe the motion of an object if the forces are balanced.

  • Describe the motion of an object if the forces are unbalanced.

  • Draw a free body diagram of an object, labelling the forces and describe the object’s motion.

Task 4c: Complete the appropriate worksheet:

Task 4d: Complete and self mark the exam questions

Set 2 &3:

Task 4e: Complete the checkpoint quiz

Now move on to task 7

Task 5 - Moments - Set 1 only

Task 5a: Watch the videos

Task 5b: Read through the slides and the BBC Bitesize pages.

Lesson 4, Moments - Default SEPS

Task 5c: Make notes that:

  • Define moment

  • Define pivot

  • Describe how a moment can be increased

  • Give the equation for calculating moments

  • Give the principle of moments

  • Draw a diagram to show clockwise and anticlockwise moments

Task 5d: Answer and self mark the exam question

Task 5e: Complete the checkpoint quiz

Task 6 - Levers and gears - set 1 only

Task 6a: Read through the slides and watch the videos

Lesson 5 Levers & Gears Seps - Default

Task 6b: Make notes that:

  • Explain why it is easier to move an object using a lever

  • Give a quantitative (involves numbers) example of this

  • Complete the example on slide 14

  • Explain what gears do

  • Give the equation which shows how the moments of a set of gears depends on their radii and number of teeth.

  • Complete the calculation on slide 22

  • Explain the difference between a high gear and low gear in a car and give the best use for each.

Task 6c: Complete the exam questions:

Task 6d: Complete the Bitesize quiz

Task 7 - Centre of mass - All sets

Task 7a: Read through the slides and watch the video

Lesson 6 Cente of Mass - Default

Task 7b: Make notes that:

  • Define centre of mass.

  • Show how to find the centre of mass of a regular shaped object and give 3 examples.

  • Explain how to find the centre of mass of an irregular shaped object.

Task 7c: Complete and self mark exam questions. Sets 2&3 only need to do the first group.

Set 3 move on to task 10 now

Task 8: Parallelogram of forces - Set 1 & 2 only

Task 8a: Read the slides and watch the video

Lesson 7: Parallelogram of Forces, Higher - Default

Task 8b: Make notes that:

  • Explain what a resultant force is

  • Write a step-by-step method for drawing a parallelogram of forces

  • Draw a parallelogram of forces for each of the questions on slide 13 to determine the size and direction of the resultant force in each case.

Task 8c: Complete the exam question

Task 9: Resolution of forces - Set 1 & 2 only

Task 9a: Read through the slides then watch the video.

Lesson 8: Resolution of Forces, Higher - Default

Task 9b: Make notes that:

  • Describe how to resolve forces using the scale diagram method.

  • Describe how to resolve forces using the trigonometry.

  • Calculate the answer to this question using both the scale diagram and trigonometric methods.

  • Describe how to resolve the parallel and perpendicular components of weight of an object on a slope

  • Define equilibrium

  • Complete the question on slide 29

Task 9c: Complete the exam question

Task 10: Summary

Task 10b: Make a mind map or single page revision summary of this topic and add it to your revision folder. Use the specification to help you:

Task 11: Check

Complete the end of unit quiz for your set:

Extend