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Forces Newton’s 3 Laws Action/ Reaction Horse and Carriage Third Law True/False $100 $100 $100 $100 $100 $100 $200 $200 $200 $200 $200 $200 $300 $300 $300 $300 $300 $300 $400 $400 $400 $400 $400 $400 $500 $500 $500 $500 $500 $500 1 ~ $100 Question Definition of a force 1 ~ $100 Answer A push or a pull 1 ~ $200 Question Forces come in what? 1 ~ $200 Answer 1 ~ $300 Question The two types of forces in an interaction are the _______ and ______ forces. 1 ~ $300 Answer Action and Reaction 1 ~ $400 Question A mutual action between objects 1 ~ $400 Answer Interaction 1 ~ $500 Question Action and reaction forces are equal and opposite- why don’t they cancel to zero? 1 ~ $500 Answer They act on two different bodies- they can only cancel if they act on the same body 2 ~ $100 Question Newton’s First Law of Motion is considered the law of _______. 2 ~ $100 Answer Inertia 2 ~ $200 Question Newton’s first law of motion states that….. 2 ~ $200 Answer An object at rest stays at rest and an object in motion stays in motion until a force acts upon it. 2 ~ $300 Question Newton’s second law of motion deals with the relationship between what three things? 2 ~ $300 Answer Acceleration, Mass and Force 2 ~ $400 Question As an ice skater pushes harder with his leg muscles, he begins to move faster. This is an example of Newton’s _____ law because… 2 ~ $400 Answer 2nd Law because acceleration and force are directly proportional- the more force you apply, the more acceleration there is 2 ~ $500 Question Using one of Newton’s 3 Laws, explain how a rocket works. 2 ~ $500 Answer Newton’s third law is action and reaction- the action of the gas leaving the bottom of the rocket pushing down towards earth then has the reaction of the gas against the rocket pushing the rocket towards the sky. 3 ~ $100 Question Newton’s third law of motion states that for every _______ there is an equal and opposite __________ 3 ~ $100 Answer Action/ Reaction 3 ~ $200 Question Action forces and reaction forces are always what two things? 3 ~ $200 Answer Equal and opposite 3 ~ $300 Question Rocketman’s rocket pushes on the gas, and therefore _____________, causing Rocketman to accelerate. 3 ~ $300 Answer the gas pushes on Rocketman 3 ~ $400 Question Explain the following: a small car is completely totaled when it crashes with a large truck, and the truck only has minor damages. 3 ~ $400 Answer Newton’s third law says the forces are equal and opposite, yet the truck has more mass, so the force has less of an affect on the truck 3 ~ $500 Question Explain the following phenomena- The strongest person on earth cannot exert a 50N force on a tissue. 3 ~ $500 Answer The forces MUST be equal and opposite, so the force exerted on the tissue can only be as great as the force the tissue can exert back. 4 ~ $100 Question If the horse pulls the carriage with 200N of force, the carriage will pull the horse with…. 4 ~ $100 Answer 200N of force 4 ~ $200 Question What are the two forces acting on the carriage? 4 ~ $200 Answer Pull and friction 4 ~ $300 Question What equation would you use to find the net force on the carriage? 4 ~ $300 Answer P (pull) – f (friction) =Net force 4 ~ $400 Question Once the horse gets the cart moving at the desired speed, does the horse continue to exert a force on the cart? 4 ~ $400 Answer Yes but only enough to overcome friction and air resistance 4 ~ $500 Question Using Newton’s 3rd Law, explain why the horse is able to get the carriage to accelerate 4 ~ $500 Answer Even though the pull of the horse on the carriage is equal and opposite to the pull of the carriage on the horse, the horse also has the force of the ground pushing back on the horse to get the carriage to move 5 ~ $100 Question State the short version of Newton’s Third Law of Motion 5 ~ $100 Answer For every action there is an equal and opposite reaction 5 ~ $200 Question State the full version of Newton’s Third Law of Motion 5 ~ $200 Answer Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first. 5 ~ $300 Question Use Newton’s 3rd law to explain why cannons (and guns) recoil 5 ~ $300 Answer The force of the cannon on the cannonball is equal and opposite the force of the cannonball on the cannon. Since the cannon has less mass, the force is equal but has less affect, causing it to recoil slightly. 5 ~ $400 Question Using Newton’s 3rd law, explain why birds fly in a V 5 ~ $400 Answer Birds wings push down on the air, so the air pushes up on them, which makes them fly. But the air makes a vortex as it pushes down on more air, which gives the bird behind it more uplift 5 ~ $500 Question Use Newton’s 2nd law to explain why the effects of the forces (outcomes) in rd Newton’s 3 law depends on the mass 5 ~ $500 Answer Newton’s 2nd Law states that acceleration is inversely proportional to mass- the more mass you have, the less acceleration you have- the more massive an object, the less of an affect the force will have 6 ~ $100 Question Speed is the measurement of distance traveled over a period of time 6 ~ $100 Answer True 6 ~ $200 Question In a tug of war, the team that wins is the team that pulls hardest on the rope 6 ~ $200 Answer False- the team that pushes on the ground the most is the team that will win 6 ~ $300 Question It is the tires, not the road, that pushes a car along 6 ~ $300 Answer False- the tires push on the road, and the road pushes back in the opposite direction, which is what makes the car move foward 6 ~ $400 Question You pull up on the earth with just as much force as the earth pulls down on you (gravity) 6 ~ $400 Answer True- the only reason it doesn’t have an affect is because the earth is much more massive than you are 6 ~ $500 Question Even though the action/reaction forces are equal and opposite, the net force on B is not zero 6 ~ $500 Answer False- the net force on B is zero because the two feet are acting on the one object with equal and opposite Identify 6 action/reaction pairs of forces in the following diagram 30 Seconds Elephant on ground- ground on elephant Elephant on rope- rope on elephant Rope on man’s right, man on rope Rope on man’s left, man on rope Rope on tractor, tractor on rope Tractor on ground, ground on tractor