Newton's Third Law Assessment

What is the key characteristic of an interaction pair that distinguishes it from other force relationships?

• They must occur simultaneously
• They must act on the same object
• They must act on different objects
• They must be perpendicular to each other

A book sits on a table. According to Newton's Third Law, what is the interaction pair for the gravitational force on the book?

• The normal force from the table
• The book's force on Earth's gravity
• The table's normal force on the ground
• The gravitational force the book exerts on Earth

Why does tension in a rope always pull equally in both directions?

• Because of Newton's First Law
• Because of Newton's Third Law
• Because ropes can only pull, not push
• Because tension is always horizontal

When you push against a wall, why do you feel a force pushing back?

• The wall is stronger than you
• Newton's Third Law requires equal and opposite forces
• Walls are designed to resist force
• The wall has more mass

A person stands in an elevator. When is the normal force NOT equal to their weight?

• When the elevator is stationary
• When the elevator moves at constant velocity
• When the elevator accelerates up or down
• When the elevator doors are open

In the notation FA on B, what does the subscript 'A on B' indicate?

• Force A is greater than Force B
• Force A is acting on object B
• Force A is moving towards B
• Force A is parallel to B

What is the relationship between interaction pair forces?

• They have different magnitudes but same direction
• They have same magnitude but opposite directions
• They have different magnitudes and different directions
• They have same magnitude and same direction

Why is understanding normal force important in physics?

• It only affects stationary objects
• It's needed to calculate friction
• It's always equal to weight
• It only acts horizontally

Two students push against each other. If Student A exerts 50N of force, what force does Student B exert?

• 25N in the opposite direction
• 50N in the same direction
• 50N in the opposite direction
• 100N in the opposite direction

When analyzing interaction pairs in free-body diagrams, what pattern should you look for in the subscripts?

• They should be identical
• They should be symmetrical
• They should be random
• They should be consecutive