What condition lets two objects exert a force directly on each other rather than across a gap?

A magnet draws a paper clip toward it across a gap. How is this force classified?

What type of force do Paolo's hands exert when he pushes a shopping cart forward?

What type of force does a canteen table exert upward on a tray resting on it?

A lamp hangs from a wire attached to the ceiling. What type of force does the wire exert on the lamp?

A book slides across a desk and slows down. What contact force opposes its sliding?

A box slides left across a level floor. In what direction does the floor's rubbing force act on the box?

How is a surface's support force directed relative to that surface?

During tug-of-war, in which direction does the taut rope pull on a pupil's hands?

Bea kicks the same ball gently, then harder, from rest under the same conditions. How does its starting speed usually compare after the harder kick?

What contact force between Jun's shoes and the floor helps prevent his feet from slipping as he walks?

A card supports a coin over a cup. When the card is completely removed, what happens to its support force on the coin?

A chair starts at rest. Two pupils push equally in opposite horizontal directions, and all other forces balance. What happens?

An unbalanced push acts on a stationary box. How does the box begin to move?

Lina adds books to a box on the same tabletop. How does this usually change the effort needed to start sliding it?

Pupils test how added books affect the push needed to slide a box. Which factor should they keep unchanged?

Nico lowers a bag onto a table until its flexible handle becomes slack. What happens to the handle's pulling force?

Althea pushes a broom right with 6 N while friction acts left with 2 N. What is the net horizontal force?

Rico gently pushes a box sideways, but it stays still. What force from the tabletop can oppose his push?

A book rests on a level desk without moving up or down. How does the desk's upward force compare with the book's weight?