Dynamics #1

In the absence of a net force, a moving object will

• slow down and eventually stop

• stop immediately

• turn right

• move with constant velocity

• turn left

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When a cat sleeps on a table, the net force on it is

• zero

• directed upward

• directed downward

• directed in the horizontal direction

• more information is required

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Wen the engines on a rocket ship in deep space, far from any other objects, are turned off, it will

• slow down and eventually stop

• stop immediately

• turn right

• move with constant velocity

• turn left

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In order for a rocket ship in deep space, far from any other objects, to move in a straight line with constant speed it must exert a net force that is

• proportional to its mass

• proportional to its weight

• proportional to its velocity

• zero

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If a book on the dashboard of your car suddenly flies towards you, the forward velocity of the car must have

• decreased

• increased

• changed direction to the right

• become zero

• changed direction to the left

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Which Newton's law can explain the following statement that we often see on the highway display: "Buckle up - it's the State Law"?

• Newton's First Law

• Newton's Second Law

• Newton's Third Law

• Gravitational Law

• None of these

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A spacecraft travels at a constant velocity in empty space far away from any center of gravity. Which of the following about the force applied on the spacecraft is true?

• The applied force is equal to its weight

• The applied force is slightly greater than its weight

• The applied force is slightly less than its weight

• The applied force is must be perpendicular to its velocity

• No applied force is required to maintain a constant velocity

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