Exploring Free Body Diagrams and Net Force

The video tutorial explains how to draw free body diagrams for five different situations. It begins with a box at rest on a table, illustrating balanced forces. The second scenario introduces unbalanced forces with rightward acceleration. The third situation involves a box moving at constant velocity, showing balanced forces again. The fourth scenario discusses a skydiver falling at constant velocity, balanced by air resistance. Finally, the fifth situation covers free-falling with acceleration, highlighting unbalanced forces. The tutorial emphasizes understanding forces, acceleration, and the importance of balanced and unbalanced forces.

What forces act on a box at rest on a table?

• Gravity and normal force

• Gravity and friction

• Only normal force

• Only gravity

Why does the box remain at rest in the first situation?

• Because the forces are unbalanced

• Because there is no force acting on it

• Because of air resistance

• Because the forces are balanced

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In the second situation, what does the term 'acceleration' imply?

• The box is moving at a constant speed

• The forces on the box are unbalanced

• The box is not moving

• The forces on the box are balanced

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What force acts leftward on the box in the second situation?

• Applied force

• Friction

• Gravity

• Normal force

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In the third situation, what can be said about the applied force and the frictional force?

• Applied force is greater than frictional force

• There is no frictional force

• Frictional force is greater than applied force

• Both forces are equal

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What is the net force on the box in the third situation?

• Greater than zero

• Zero

• Less than zero

• Depends on the direction of motion

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In the fourth situation, what force balances the force of gravity?

• Friction

• Normal force

• Air resistance

• Applied force

Why is the net force zero in the fourth situation?

• Because the skydiver is accelerating

• Because the skydiver is at rest

• Because there is no air resistance

• Because the forces are balanced

In the fifth situation, why is the skydiver accelerating?

• Because the forces are balanced

• Because there is no gravitational force

• Because the air resistance is greater than the gravitational force

• Because the gravitational force is greater than the air resistance

Tags

NGSS.MS-PS2-2

What can be inferred about the forces in the fifth situation?

• Gravitational force is greater than air resistance

• There is no air resistance

• Gravitational force is less than air resistance

• They are balanced