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### 20 Cards in this Set

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 Newton's first law is the law of ____ inertia inertia = when an object resists change in it's motion 2 examples of newton's first law are... 1. a car's brakes stopping it 2. a crash test dummy Newton's First Law= an object in motion will stay in motion, and an object at rest will stay at rest, unless opposed by an unbalanced force Newton's 3rd law is the law of _______ action/reaction What is newton's 3rd law? For every action, there is always an equal and opposite reaction. What is newton's 2nd law? Force=Mass x Acceleration Acceleration=Force/Mass The net force is ..... The force equired to accelerate 1 kg of mass at 1 m/s2 1 N = 1 kg x 1 _____ m/s2 How can you add friction increase pressure How can you reduce friction? add more contact add a lubricant What is friction? A force that opposes motion when 2 objects are in contact When does friction exist When two objects are in contact. What are some examples of friction? Bowling, ice skating, sitting in a chair, guitar. What are two things that friction depends on? 1. How uneven the surfaces are (roughness) 2. How hard the surfaces push against each other (pressure) Define and give examples of the 2 types of friction A. Siliding friction-when one surface slides over the other B. Rolling friction-when one surface rolls over the other Why do cars with underinflated tires use more gas? When theres more contact, you need more power What is fluid friction? Contact with a non-solid What determins high or low MU factors? The amount of friction What are lubricants used for? To reduce friction