Jove Quiz

A book is placed on a table. The weight of the book is balanced by the normal force exerted by the table. Which of the following statements describes this scenario?

• The book is in dynamic equilibrium because it is at rest.

• The book is in static equilibrium because the net force acting on it is zero.

• The book is in dynamic equilibrium because there is no motion.

• The book is in static equilibrium because the net torque acting on it is zero.

A person is trying to open a door by applying a force perpendicular to the door. However, the door remains in its position and does not rotate. Which of the following statements describes this scenario?

• The person is applying a force that is too small.

• The person is applying a force that is too big.

• The net force acting on the door is zero.

• None of these.

What is a free-body diagram?

• A diagram that shows the direction of motion of an object.

• A diagram that shows the acceleration of an object.

• A diagram that shows all the forces acting on an object.

• A diagram that shows the velocity of an object.

What do the arrows in a free-body diagram represent?

• The direction of motion of an object.

• The size of an object.

• The direction and magnitude of forces acting on an object.

• The color of an object.

How are isolated systems represented in a free-body diagram?

• With complex outlines.

• With simple dots or outlines.

• With multiple arrows.

• With different colors.

Consider a car moving on a level road at a constant speed.

How can the normal force acting on a car be represented in a free-body diagram?

• By an arrow perpendicular to the road surface

• By an arrow pointing downwards

• By an arrow pointing sideways

• None of these

A person is pushing a heavy box across a flat surface. Consider a free-body diagram for the box and then use it to answer the following questions.

Which force is represented by an arrow pointing upwards in a free-body diagram of the box being pushed on a flat surface? 

• Frictional force

• Normal force

• Tension force

• Weight force