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24 Cards in this Set
- Front
- Back
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What is Newton's First Law of Motion?
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An object at rest tends to stay at rest, while an object in motion tends to stay in motion (constant speed) (straight line) unless acted upon by an unbalanced force.
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What is Newton's First Law often referred to as?
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The Law of Inertia
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What is inertia?
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The tendency of an object to resist a change in motion.
(More mass = more inertia) |
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What is an example of Newton's First Law of Motion?
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A watermelon is harder to move than an apple because it has more inertia.
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What is Newton's Second Law of Motion?
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The acceleration of an object depends on the mass of the object and the force used to move it.
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What is the formula for Force?
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Force = Mass x Acceleration
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What is the formula for Acceleration?
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Acceleration = Force/Mass
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What is an example of Newton's Second Law of Motion?
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If two objects are moving at the same speed, the one with more mass has more force. (semi-truck vs. small car).
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What is Newton's Third Law of Motion?
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All forces exist in pairs and every action has an EQUAL and OPPOSITE reaction.
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What is Air Resistance?
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Friction in the air.
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What is an example of Newton's Third Law of Motion?
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Balloon rocket from Newton’s Labs
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What is Force?
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Any push or pull acting on an object.
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What is force measured in?
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Measured in Newtons (N)
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What is a balanced force?
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They DO NOT cause the object to change its motion (Net Force = o Newtons).
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What is an unbalanced force?
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They DO cause a change in motion (Net force > 0 Newtons).
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What is Net Force?
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The total of all forces acting on an object (add forces working together) (subtract forces in opposite direction).
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What is Friction?
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A force that opposes motion between two surfaces in contact.
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What are ways to increase friction?
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1. Make the surface rougher
2. Increase the mass/pressure |
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What are ways to decrease friction?
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1. Make the surface smoother
2. Reduce the mass/pressure 3. Use wheels 4. Add oil, grease, wax, etc. |
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What is Gravity?
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The force of attraction between two objects with mass.
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What two things does gravity depend on?
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1. MASS: more mass = more gravity
2. PROXIMITY: closer together = more gravity |
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What is the difference between Mass and Gravity?
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Mass is measured in grams (Newtons), uses a balance (scale), is the amount if matter in an object (measure of gravity), and it stays constant (changes).
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What is acceleration due to gravity?
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9.8m/s/s
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What three things does air resistance depend on?
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Speed, surface area, and shape
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