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19 Cards in this Set
- Front
- Back
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Speed is... |
How fast something is moving, always measured in terms of a unit of distance over a unit of time, and the distance covered per unit of time |
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Possible units of speed... |
Miles/hour, light years/century, and km/hour |
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Acceleration is defined as the CHANGE in... |
time it takes to move from one speed to another speed |
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A train travels 6 meters in the first second of travel, 6 meters again during the second second of travel,and 6 meters again during the third second. Its acceleration is |
0 m/s^2 |
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In the absence of air resistance, objects fall at constant |
Acceleration |
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When something falls to the ground, it accelerates. This acceleration is called the acceleration due togravity and is symbolized by the letter g. What is the value of g on Earth's surface? |
about 10 m/s^2 |
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A pencil lies on your desk. If the Earth is moving around the sun at a speed of 30 km/s, how fast is thepencil moving relative to the desk? How fast is the pencil moving relative to the sun? |
0 km/s; 30km/s |
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A 15-N force and a 45-N force act on an object in opposite directions. What is the net force on the object? |
30 N |
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A 5-N force and a 30-N force act in the same direction on an object. What is the net force on the object? |
35 N |
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What is needed to describe a vector quantity? |
Both magnitude and direction |
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A scalar quantity has |
Only magnitude |
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The momentum of an object is defined as the object's |
Mass times its velocity |
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Which has more momentum, a large truck moving at 30 miles per hour or a small truck moving at 30miles per hour? |
The large truck |
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Compared to its weight on Earth, a 10-kg object on the moon will weigh |
Less |
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An object weighs 30 N on Earth. A second object weighs 30 N on the moon. Which has the greater mass? |
The one on the moon |
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What is the average speed of a cheetah that runs 88 m in 5 seconds? |
17.6 m/s |
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A hockey puck is hit with the same force on ice and on pavement. Why does the hockey puck on icetravel farther than a hockey puck on the pavement? |
the coefficient of friction is less on icethan on pavement |
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Inertia is |
the tendency of an object to resist anychange in its motion. |
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What is the minimal force a nurse must exert to lift her 5.0 kg patient out of his bed? |
idk yet |
