# Unit: Section A

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### Unit Description

Forces and Motion

### Lessons

 Chapter 1 Movement and Position Resources: 10 * Speed, Velocity, Acceleration, D-T and V-T graphs 10,272 Chapter 2 Forces and Shape Resources: 17 * To be able to understand that forces can be described as contact forces or provide action at a distance. * To know the different ‘categories’ of forces (weight, frictional etc). * To understand the effects of adding up forces as vectors and realising that balance and unbalanced forces have different outcomes on an object. * To understand the basics of frictional forces and their effects – to investigate these too. * To understand that forces can change the shape of an object but that this may not be permanent. * Thus: Hooke’s Law must be investigated for metal spring and an elastic band. 5,094 Chapter 3 Forces and Movement Resources: 20 * To be able to understand that unbalanced forces result in an object accelerating and that the magnitude of this depends on the size of F and m. * To investigate Newton’s Second Law * To understand the factors involved in braking: friction, thinking and braking distance, reaction time. * To be able to draw V-T diagrams for decelerating objects. * To understand where gravitational attraction arises from and that values for the gravitational attraction are constant (close to a planet). * To not be confused between mass and weight. * To be able to describe how air resistance, drag and weight forces can change such that a falling object may reach terminal velocity. * To be able to draw V-T diagrams for falling objects with parachutes. 2,151 Chapter 4 Momentum Resources: 9 •UnderstandNewton’s 3 laws in their basic sense but including F = ma. •Know that momentum is a vector quantity and = mass x velocity. Momentum is nothing to do with moments! •Know that when objects collide that they exert equal and opposite forces on each other which results in a momentum change for each body •To be able to calculate collision, conservation problems in a linear situation •To apply this to elastic, partially elastic and inelastic collisions and explosions. Conservation of KE and momentum are required. Conversion of energy to other forms. •Implications of such collision types: rockets, car safety etc •Know and use: Force = change in momentum/time taken and connecting this with car safety and catching cricket balls. 6,640 Chapter 5 The Turning Effect Resources: 6 • Forces may produce a turning effect on a body • Moment = force x perpendicular distance (and appropriate units) • Principle of moments - conditions for balance • What is the COG and how do you find it experimentally? • Why some objects are more stable than others 2,618 Chapter 6 Astronomy Resources: 17 • To know the contents of the solar system and to be aware other non-planetary constituents: asteroids, moons, comets, natural and artificial satellites etc. Note: Pluto is no longer the 9th planet • To know that there is a galaxy called the milky way and the facts … • To understand what gravitational strength means and to be able to predict how it will change with distance and mass of the interacting bodies (Newton’s law of gravitation) • To understand the connection between Newton’s law of gravitation and the elliptical orbits followed by the planets in the solar system. To know how the orbit of comets differs from planets • To understand and be able to recall and use the equation for orbital speed: v = 2πr / T, clearly making this relevant to orbital times of planets (but recalling that they are not circular – but near enough for what we want to do!) 4,077 New Lesson 253

### Unit Resources

 Friction.flv 182 LP Chapter 2 Forces and Shape.doc 147 PPT Chapter 2 Forces and Shape.ppt 277 Tug of war clip.mpeg 113 WS Labelling more than one force.doc 145 PPT Chapter 2 Forces and Shape 420 WS Ray Diagrams - Images Objects and Peppers Ghost.pptx   Classwork 499 WS Reviewing Forces Chapters 1-2-3.pub   Notes 56