Physics Chapter 7 Test – Flashcards
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is constant
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When an object is moving with uniform circular motion, the object's tangential speed...
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is directed toward the center of motion
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When an object is moving with uniform circular motion, the centripetal acceleration of the object...
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friction, gravity, tension
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Name three centripetal forces.
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in the plane of the object's motion and perpendicular to the tangential speed
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The centripetal force on an object in circular motion is...
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in the same direction as the centripetal acceleration
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The centripetal force on an object in circular motion is...
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2.0 m/s^2
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A child rides a bicycle in a circular path with a radius of 2.0 m. The tangential speed of the bicycle is 2.0 m/s. The combined mass of the bicycle and the child is 43 kg. What is the magnitude of the bicycle's centripetal acceleration?
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86 N
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A child rides a bicycle in a circular path with a radius of 2.0 m. The tangential speed of the bicycle is 2.0 m/s. The combined mass of the bicycle and the child is 43 kg. What is the magnitude of the centripetal force on the bicycle?
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friction
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What kind of force provides the centripetal force on the bicycle?
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inertia
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When a car makes a sharp left turn, what causes the passengers to move toward the right side of the car?
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inertia
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A ball is whirled on a string, then the string breaks. What causes the ball to move off in a straight line?
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The gravitational field strength is less on the moon's surface than on Earth's surface
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Why does an astronaut weigh less on the moon than on Earth?
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inertial mass
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An object's tendency to resist acceleration is measured by the object's...
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Free-fall acceleration is the same at all points where the gravitational field strength is the same
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What confirms that gravitational mass and inertial mass are equivalent?
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F{g}=G(m{1}m{2}/r^2)
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What equation expresses Newton's law of universal gravitation?
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from the center of each body
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When calculating the gravitational force between two extended bodies, you should measure the distance...
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farthest from the axis of rotation
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Where should a force be applied on a lever arm to produce the most torque?
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as far from the hinges as possible
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If you want to open a swinging door with the least amount of force, where should you push on the door?
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Use a wrench with a longer handle
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If you cannot exert enough force to loosen a bolt with a wrench, what should you do?
