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APPLYING AN EFFECTIVE FORCE & NEWTON’S LAWS OF MOTION Week 7 Inertia A measure of how __________ it is to change an object’s motion The greater the inertia, the more difficult it is to change the __________ of the object The heavier the object, the greater the inertia Inertia Kicking a ball or kicking a brick… Which has the greatest inertia? Momentum A measure of the amount of motion possessed by a ___________ body Velocity: the rate of positional change of an object Momentum = mass (kg) x velocity (m/s) An object can only have momentum if it is moving To increase momentum, an object must either increase its _________ or its __________ Momentum Impulse Application of force over a period of __________ Changes the velocity of a body or object Impulse = force x time Impulse Impulse & Accuracy Flattening the arc: The bat/racquet/hand moves in a straight line at the point of contact/release This increases accuracy Force Reception/Absorption An object’s force must be received or absorbed over a distance to slow it and stop it Eg: cricket catching – ‘give with the hands’ Newton’s Laws of Motion 1st Law: Inertia 2nd Law: Acceleration 3rd Law: Action & Reaction First Law of Motion - Inertia An object whether at rest or in motion will continue in that state unless it is acted upon by a force strong enough to change its state of motion or rest’ First Law of Motion - Inertia Second Law of Motion – Acceleration/Momentum The acceleration of an object is directly proportional to the amount of force applied and takes place in the direction in which the force is applied Second Law of Motion – Acceleration/Momentum Third Law of Motion – Action & Reaction For every action there is an equal and opposite reaction Third Law of Motion – Action & Reaction Conservation of Momentum The total momentum of two objects before impact will equal the total momentum after impact The momentum of an object is never lost, but rather _____________ on contact with other objects Conservation of Momentum