Question

practice it!
select the statement(s) that are examples of non - contact forces.
□ magnet attracting metal filings
□ sock clinging to a shirt
□ pushing a door open
□ ball falling to the ground
□ pulling a wagon across the park

Explanation:

• A non - contact force is a force that acts on an object without physical contact.
• A magnet attracting metal filings: Magnets exert a magnetic force on metal filings without touching them, so this is a non - contact force.
• A sock clinging to a shirt: This is due to static electricity (electrostatic force), and the sock and shirt don't need to be in direct contact in the way a contact force (like pushing) requires, so this is a non - contact force.
• Pushing a door open: This is a contact force as the hand is in contact with the door.
• A ball falling to the ground: This is due to gravity, which is a non - contact force (the Earth exerts a gravitational force on the ball without touching it).
• Pulling a wagon across the park: This is a contact force as the person (or object) pulling is in contact with the wagon.

Answer:

A. magnet attracting metal filings, B. sock clinging to a shirt, D. ball falling to the ground