Kerala Board Class 9 Science — Flashcards for Quick Revision

A: This happens due to DIFFUSION. Perfume particles move from high concentration (spray point) to low concentration areas, mixing with air particles. Gas particles move continuously and have large spaces

A: Matter is anything that occupies space and has mass. Examples include water we drink, air we breathe, food we eat, and our body. All substances around us are forms of matter.

A: AIR (gas) has large spaces between particles and weak forces of attraction, making it highly compressible. WATER (liquid) has particles closer together with stronger attraction forces, making it nearl

A: Total distance = 300 + 300 = 600 km Total time = 4 + 5 = 9 hours Average speed = Total distance ÷ Total time = 600 ÷ 9 = 66.67 km/h Note: Average velocity = 0 (since displacement is zero)

A: Due to inertia - the tendency of objects to resist change in motion. When the bus accelerates forward, passengers' bodies tend to remain at rest due to inertia, causing them to lean backward relative

A: Distance is the total path length traveled (scalar). Displacement is the shortest distance between initial and final positions with direction (vector). Example: If you walk 50m east, then 30m west: Di

A: The bicycle gradually slows down and stops due to friction. This demonstrates that objects in motion don't naturally come to rest - external forces like friction and air resistance cause them to stop.

A: Due to inertia of rest - the coin tends to remain at rest while the paper is pulled away quickly. The coin has insufficient time to gain horizontal velocity and falls vertically into the glass due to

A: Using Newton's Second Law: F = ma F = 2 kg × 3 m/s² = 6 N The net force acting on the object is 6 Newtons in the direction of acceleration.