CBC Grade 8 Notes in Kenya-What’s is friction?

Friction is the force resisting the relative motion of two surfaces in contact, acting in the opposite direction of movement. It arises from microscopic surface irregularities—asperities—rubbing together, resulting in energy dissipation as heat. Friction can be either beneficial (walking, braking) or detrimental (engine wear).

FRICTION

• Friction is the force that opposes motion (movement) between two surfaces over each other.
• It is a force that resists the sliding of an
• Friction is measured in
• Friction is more on rough surfaces and less on smooth

Friction can stop or slow down a moving object