Dynamics

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

• slow down and eventually stop
• stop immediately
• move with a constant velocity
• drift right or left

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

• zero
• directed upward
• directed downward
• more information is required

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

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

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

The acceleration of an object is inversely proportional to 

• the net force acting on it
• its position
• its velocity
• its mass

A loaded truck collides with a car causing huge damage to the car. Which of the following is true about the collision?

• The force on the truck is greater than the force on the car
• The force on the car is greater than the force on the truck
• The force on the truck is the same in magnitude as the force on the car
• During the collision the truck has greater acceleration than the car

When a baseball is struck by a bat, the force of the bat on the ball is equal and opposite to the force of the ball on the bat.  This is an example of 

• Newton's First Law
• Newton's Second Law
• Newton's Third Law
• Newton's Law of Gravitation

If you exert a force F on an object which has a much greater mass than you do, the force which the object exerts on you will 

• be of magnitude F and in the same direction
• be of magnitude F and in the opposite direction
• be of much less magnitude than F
• be of much greater magnitude than F

Earth pulls downward on a pen, of mass m, which is sitting on a table; the magnitude of the force is mg.  If that is called the action force, what is the reaction force? 

• The table pushing up on the pen with a force equal to mg 
• The pen pulling upward on Earth with a force equal to mg
• The pen pushing down on the table with a force equal to mg
• The table pushing down on the floor with a force equal to mg