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15 Cards in this Set
- Front
- Back
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A force
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a push or pull, or any action that has the ability to change motion.
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Newton’s first law
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An object at rest will stay at rest and an object in motion will continue in motion with the same speed and direction UNLESS acted on by a force.
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Inertia
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is the property of an object that resists changes in its motion.
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newton (N)
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is the metric unit of force. A force of one newton is the exact amount of force needed to cause a mass of one kilogram to speed up by one meter per second each second
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net force
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the total of all forces acting on an object.
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Acceleration
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is the rate at which your
speed increases. If speed increases by 1 kilometer per hour (km/h) each second, the acceleration is 1 km/h per second. |
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deceleration
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describe the motion that is slowing down.
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Newton’s second law
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relates the net force on an object, the mass of the
object, and acceleration. It states that the stronger the net force on an object, the greater its acceleration. |
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free fall
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An object is in free fall if it is accelerating due to the force of gravity and no
other forces are acting on it. |
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acceleration due to gravity.
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Objects in free fall on Earth accelerate downward at 9.8 m/sec2, the acceleration due to gravity. Because this acceleration is used so frequently in physics, the letter g is used to represent its value. When you see the letter g in a physics question, you can substitute the value 9.8 m/sec2.
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Velocity
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speed with direction.
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weight
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The force of gravity on an object is called weight. The symbol Fg stands for “force of gravity” and is used to represent weight.
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air resistance
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When something falls through air, the air exerts an additional force. This force, called air resistance, acts against the direction of the object's motion
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terminal speed.
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The terminal speed depends on the
ratio of an object’s weight to its air resistance. A tightly crumpled ball of paper has a faster terminal speed than a flat piece of paper because the flat sheet has more air resistance even though the papers' weights are the same. |
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slope
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The slope of a line is the ratio of the “rise” (vertical change) to the “run” (horizontal change).
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