Question

which of the following is a contact force? a. magnetic force b. electrical force c. friction d. gravity

Explanation:

• Magnetic force: Acts at a distance without physical contact. For example, magnets can attract or repel each other without touching.
• Electrical force: Also acts at a distance. Like - charged objects repel and unlike - charged objects attract without direct contact.
• Friction: Occurs when two surfaces are in contact and there is relative motion or a tendency for relative motion between them. For instance, when you push a book on a table, friction acts between the book and the table surface (contact is necessary).
• Gravity: Is a non - contact force. The Earth attracts objects (like an apple falling from a tree) without direct physical contact.

Answer:

C. Friction