12 terms

# Physics Newton's Laws - Conceptual Questions

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Why does it seem so hard to get massive objects like a car moving, but once they are moving it doesn't take as much to keep them rolling?
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There is a problem, if forces exist in equal but opposite pairs, how could gravity possibly work? When Mr. Bay jumps, the Earth pulls him down. Where is the other force?
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The sun exerts a force on the earth. According to Newton, the earth also exerts a force on the sun.
a. How do these two forces compare?
b. Why does it seem like the Earth does not affect the sun in any way?
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When a cannon shoots a cannon ball, the cannon moves back. Newton's laws explain this, but why does the cannon ball move so much faster and farther than the cannon?
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Explain why seat belts are so important using Newton's 3 laws.
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If a car moves with constant acceleration, can you conclude that there are no forces acting on it? Why?
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If gold were sold by weight, would you rather buy it in Denver (high elevation) or Death Valley (low elevation)? If it were sold by mass, in which of the two locations would you rather buy it? Why?
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In the motion picture, It Happened One Night, Clark Gable is standing inside a stationary bus in front of Claudette Colbert, who is seated. The bus suddenly starts moving and Clark falls into Claudette's lap. Why did this happen?
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In a tug-o-war between two athletes, each pulls on the rope with a force of 200 N. What is the tension in the rope? If the rope doesn't move, what horizontal force does each athlete exert against the ground?
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As a rocket is fired from a launching pad, its speed and acceleration increase with time as its engines continue to operate. Explain why this occurs even though the thrust of the engines remain constant.
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Identify the action-reaction force pairs in the following situations: (a) a man takes a step; (b) a snowball hits a girl from behind; (c) a basketball player catches a ball; and (d) a gust of wind strikes a window.
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Compare and contrast bowling on Earth to bowling on the moon where the acceleration due to gravity is roughly 1/6th the acceleration due to gravity on Earth. 82
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