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Chapter 10 Forces Objects will not begin to move or change motion until an unbalanced force acts on it. Newton’s 1st Law of Motion Inertia All mass resists a change in motion Depends on mass Greater mass = more inertia

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Chapter 10 Forces Newton’s 2nd Law of Motion Changes in force & mass Acceleration increases when force (push or pull) increases when mass decreases

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Chapter 10 Forces Determining Acceleration Acceleration (motion) depends on how much force is used and the amount of mass. acceleration = Force mass Newton’s 2nd Law of Motion

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Chapter 10 Forces Newton’s 3 rd Law of Motion If one object exerts a force on another object, then the second object exerts a force back that is… equal in strength and opposite in direction on the first object.

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Chapter 10 Forces Momentum “quantity of motion” depends on the mass and the velocity Momentum (p) = mass (kg) x velocity (m/s)

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Chapter 10 Forces - Conservation of Momentum Momentum is conserved.. when 2 objects collide remains the same before and after the collision

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Chapter 10 Forces Pg.392 Calculating Force A speedboat pulls a 55-kg water-skier. The skier to accelerates at 2.0 m/s 2. Calculate the net force that causes this acceleration. What is the question asking for? What information have you been given? Mass of the water-skier (m) = 55 kg Acceleration of the water-skier (a) = 2.0 m/s 2

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Chapter 10 Forces Pg.392 Calculating Force Practice Problem What is the net force on a 1,000-kg object accelerating at 3 m/s 2 ? F = ma =1,000 kg x 3 m/s 2 = 3,000 N

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Chapter 10 Forces Calculating Momentum Which has more momentum: a 3.0-kg sledgehammer swung at 1.5 m/s, or a 4.0-kg sledgehammer swung at 0.9 m/s? Read and Understand What information are you given? Mass of smaller sledgehammer = 3.0 kg Velocity of smaller sledgehammer = 1.5 m/s Mass of larger sledgehammer = 4.0 kg Velocity of larger sledgehammer = 0.9 m/s

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Chapter 10 Forces Calculating Momentum Which has more momentum: a 3.0-kg sledgehammer swung at 1.5 m/s or a 4.0-kg sledgehammer swung at 0.9 m/s? What formula contains the given quantities and the unknown quantity? Momentum = Mass x Velocity p = mv Smaller sledgehammer = 3.0 km x 1.5 m/s = 4.5 kgm/s Larger sledgehammer = 4.0 km x 0.9 m/s = 3.6 kgm/s

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Chapter 10 Forces Calculating Momentum Practice Problem A golf ball travels at 16 m/s, while a baseball moves at 7 m/s. The mass of the golf ball is 0.045 kg and the mass of the baseball is 0.14 kg. Which has greater momentum? Golf ball: 0.045 kg x 16 m/s = 0.72 kgm/s Baseball: 0.14 kg x 7 m/s = 0.98 kgm/s The baseball has greater momentum.

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Chapter 10 Forces Calculating Momentum Practice Problem What is the momentum of a bird with a mass of 0.018 kg flying at 15 m/s? 0.27 kgm/s (0.018 kg x 15 m/s = 0.27 kgm/s)

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Chapter 10 Forces Section 5: Rockets and Satellites How does a rocket lift off the ground? What keeps a satellite in orbit?

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Chapter 10 Forces What Is a Satellite? A projectile follows a curved path. The horizontal and vertical motions act independently.

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Chapter 10 Forces What Is a Satellite? The faster a projectile is thrown, the father it travels before it hits the ground. A projectile with enough velocity moves in a circular orbit.

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Chapter 10 Forces What Is a Satellite? Depending on their uses, artificial satellites orbit at different heights.

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Chapter 10 Forces End of Section: Rockets and Satellites

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