# Chapter 2 force and motion(Teacher)

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UNTUK GURU DAN PELAJAR TINGKATAN 4
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## Velocity

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NAME : ENCIK MOHAMED TARMIZI ABD KADIR FORM 4 : 4 CERDIK, 4 CERDAS, 4 PINTAR   LEARNING OUTCOMES :By the end of this lesson, you should be able to:2.1Linear Motion * Define distance and displacement* Define speed and velocity* Define acceleration and deceleration* Calculate speed and velocity* Calculate acceleration and deceleration* Solve problems on linear motion with uniform acceleration 2.2 Motion Graphs * Plot and interpret displacement-time and velocity-time graphs* Deduce from shape of displacement-time graph* Determine distance, displacement and velocity from a displacement-time graph* Deduce from the shape of a velocity-time graph* Determine distance, displacement, velocity and acceleration from v-t  grph* Solve problems on linear motion with uniform acceleration 2.3 Inertia  * Explain what inertia is* Relate mass to inertia* Give examples of situations involving inertia* Suggest ways to reduce the negative effects of inertia  2.4 Momentum and Conservation of Momentum * Define the momentum of an object* Define momentum as the product of mass and velocity, p = mv* State the principle of conservation of momentum* Describe applications of conservation of momentum* Solve problems involving momentum 2.5 Effect of Forces * Describe the effects of balanced forces acting on an object* Describe the effects of unbalanced forces acting on an object* Determine the relationship between forces, mass and acceleration, F = ma* Solve problem using F = ma 2.6 Impulse and Impulsive Force * Explain what an impulsive force is* Give examples of situations involving impulsive force* Define impulse as a change of momentum, Ft = mv - mu* Define impulsive force as the rate of change of momentum in a collision2  * Explain the effect of increasing / decreasing time of impact on the impulsive force* Describe situations where an impulsive force needs to be reduced* Describe situations where an impulsive force is beneficial* Solve problems involving impulsive forces 2.7 Safety Features in the Design of Vehicles * Describe the importance of safety features in vehicles  2.8 Gravity  * Explain acceleration due to gravity* State what a gravitational field is* Define gravitational field strength* Determine the value of acceleration due to gravity* Define weight as the product of mass and acceleration due to gravity, W = mg* Solve problems involving acceleration due to gravity 2.9 Analyzing a scientific investigations * Describe situations where forces are in equilibrium* State what a resultant force is* Add two forces to determine the resultant force* Resolve a force into two effective component forces* Solve problems involving forces in equilibrium  2.10 Work, Energy, Power and Efficiency  * Define work as the product of applied force and displacement of an object, W= Fs* State that when work is done, energy is transferred from one object to another * Define kinetic energy and state that E k  = ½ mv 2 * Define gravitational potential energy and state that E  p = mgh* State the principle of conservation of energy   * Define power * Explaine what efficiency of a device is* Solve problems involving work, energy, power and efficiency 2.11 The Importance of Maximising the Efficiency of Devices * Recognise the importance of maximising efficiency of devices in conservingresources  2.12 Analyzing a scientific investigations * Define elasticity* Define Hooke’s Law* Define elastic potential energy and state that E  p = ½ kx 2 * Describe applications of elasticity* Solve problems involving elasticity3  2.1 : Linear Motion : Motion along a straight line. Examples: ã a car moving on a straight road ã a person walking down a hallway ã a sprinter running on a straight race course ã dropping a pencil ã throwing a ball straight up ã a glider moving on an air track  ã and many others...1. Distance : The total path length travelled from one location to another.It is a scalar quantity. The SI unit is metre (m)2. Displacement : The distance between two locations measured along the shortest pathconnecting them, in a specified direction.It is a vector quantity The SI unit is metre (m) Example 1: If Mawi takes 10s to finish each of following paths AB, find the total distance anddisplacement travelled .8m6m1m2m figure 2.1A B(i) Total distance travelled : 2m +1m + 6m + 8m + 8m = 25m4
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