Forces in Motion and Free Body Diagrams

The video tutorial explains how to draw free body diagrams for five different situations. It begins with a box at rest on a table, where forces are balanced. The second situation involves a box moving with rightward acceleration due to unbalanced forces. The third situation describes a box moving at constant velocity with balanced forces. The fourth situation involves a skydiver falling at constant velocity, where air resistance balances gravity. Finally, the fifth situation shows a free-falling skydiver with unbalanced forces, highlighting the basics of forces and motion.

What happens to the box when the forces acting on it are equal and opposite?

• The box remains at rest.

• The box moves downward.

• The box accelerates to the right.

• The box moves upward.

What is the net force on a box at rest on a table?

• Less than zero

• Greater than zero

• Zero

• Equal to the gravitational force

What does the presence of acceleration indicate about the forces on the box?

• The forces are balanced.

• The forces are unbalanced.

• The box is at rest.

• There is no friction.

When a box accelerates to the right, what can be said about the frictional force?

• It is greater than the applied force.

• It is equal to the applied force.

• It is zero.

• It is less than the applied force.

If a box is moving at a constant velocity, what can be said about the forces acting on it?

• The forces are unbalanced.

• The net force is zero.

• The box is accelerating.

• The friction is greater than the applied force.

What happens to the size of the arrows representing forces when a box moves at constant velocity?

• The arrows for gravitational and normal forces are the same size.

• The arrows for gravitational and normal forces are different sizes.

• The arrows for applied and frictional forces are the same size.

• The arrows for applied and frictional forces are different sizes.

What force balances the gravitational force on a skydiver falling at constant velocity?

• Normal force

• Frictional force

• Applied force

• Air resistance

What is the role of air resistance for a skydiver at constant velocity?

• It is greater than the gravitational force.

• It is less than the gravitational force.

• It balances the gravitational force.

• It is zero.

In free fall, why is the gravitational force greater than the air resistance?

• Because the air resistance is zero.

• Because the skydiver is at rest.

• Because the forces are balanced.

• Because the skydiver is accelerating.

During free fall, what is the relationship between gravitational force and air resistance?

• Gravitational force is zero.

• Gravitational force is equal to air resistance.

• Gravitational force is less than air resistance.

• Gravitational force is greater than air resistance.