Frequently Asked Questions
The direction of the frictional force acting on a tilted writing board is opposite to the direction in which the object would slide down. It acts vertically upwards on the board.
It becomes more difficult to walk on the floor when there is soapy water spilled on it. The force of friction decreases between the ground and the feet due to the presence of soapy water.
Sportsmen use shoes with spikes for better grip while running. Spikes increase the force of friction between the shoes and the ground, providing improved traction.
Seema will have to apply a larger force to push a similar heavier box compared to Iqbal. This is due to the stronger interlocking of irregularities between the box and the floor.
Sliding friction is less than static friction because interlocking between surfaces is stronger when they are at rest, requiring more force to overcome. During sliding, the interlocking is not as strong, resulting in less force needed.
Friction is a friend as it allows us to walk, write, and grip objects. However, it's a foe as it causes wear and tear, generates heat, and opposes motion in machines.
Objects moving in fluids experience drag force due to friction. Special shapes minimize drag force, making it easier for objects to move through the fluid.