Dynamics Quiz 1 Review

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

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

When 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

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

• proportional to its displacement

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

Which Newton’s law can explain the following statement that we often see on the highway display: “Buckle up –it’s the State Law”?

• First Newton's Law

• Second Newton's Law

• Third Newton's Law

• Gravitational Law

• None of his laws

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 must perpendicular to its velocity

• No applied force is required to maintain a constant velocity

A boy rides a bicycle at a constant velocity. Which of the following about the net force is true?

• There is a net force acting in the velocity direction

• There is a net force acting opposite to the velocity direction

• The new force is zero

• There is a net force acting perpendicularly to the velocity direction

• None of the above

A passenger standing in a moving bus, facing forward suddenly falls forward. This can be an indication which of the following?

• The bus speeds up

• The bus slows down

• The bus doesn't change is velocity

• The bus turns right

• The bus turns left

A passenger standing in a moving bus, facing forward suddenly falls to the right. This can be an indication which of the following?

• The bus speeds up

• The bus slows down

• The bus doesn't change is velocity

• The bus turns to the right

• The bus turns to the left