A Common Misconception about Newton's Thrid Law Force Pairs (or Action-Reaction Pairs)

The video extends the concept of Newton's third law and force pairs, suggesting viewers watch a previous video for better understanding. It explains the forces acting on a book using a free body diagram, highlighting that the normal force and gravity are equal in magnitude but opposite in direction. However, these forces do not form a Newton's third law pair as they act on the same object. The video provides examples of true Newton's third law pairs, where forces act on different objects, such as the book and the table or the book and the earth. The video concludes with a thank you to the audience.

What is suggested to do before watching this video to better understand the concept?

• Read a textbook on physics

• Practice solving physics problems

• Discuss with a friend

• Watch a previous video on Newton's third law

Which forces are acting on the book according to the free body diagram?

• Normal force and gravitational force

• Magnetic force and electric force

• Centripetal force and centrifugal force

• Friction and tension

Why are the normal force and gravitational force not considered a Newton's third law force pair?

• They are not opposite in direction

• They are not equal in magnitude

• They are not real forces

• They act on the same object

What is a characteristic of a Newton's third law force pair?

• Forces act on the same object

• Forces are in the same direction

• Forces act on two different objects

• Forces are not equal in magnitude

Which of the following is an example of a Newton's third law force pair?

• The force of a car engine and the friction on the road

• The push of a hand on a wall and the wall's push on the hand

• The gravitational pull of the Earth on a book and the book's pull on the Earth

• The tension in a rope and the weight of a hanging object