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