(a) motion (b) nature (c) heat (d) reduces (e) less.
- a. rolling, static, sliding
- b. rolling, sliding, static
- c. static, sliding, rolling
- d. sliding, static, rolling
(c) static, sliding, rolling.
- a. wet marble floor, dry marble floor, newspaper and towel
- b. newspaper, towel, dry marble floor, wet marble floor
- c. towel, newspaper, dry marble floor, wet marble floor
- d. wet marble floor, dry marble floor, towel, newspaper
(a) wet marble floor, dry marble floor, newspaper and towel.
Friction acts up the inclined surface, opposite to the downward sliding motion.
More difficult, because soap reduces friction and makes the floor slippery.
Spikes increase friction with the ground and give better grip.
Seema, because a heavier box presses harder on the floor and produces greater friction.
Once surfaces start sliding, their contact interlocking is reduced compared with the force needed to start motion.
Friction helps us walk, write, hold objects and stop vehicles using brakes. It is a foe because it causes wear and tear, produces unwanted heat and wastes energy in machines.
Streamlined shapes reduce fluid friction or drag, allowing easier and faster motion.