Friction Test -...

To every action there is always an equal and opposite reaction. Which of the following statements is correct regarding this?

John carried out an experiment to find out how different surfaces (P, Q, R and S) affect the distance a car travelling at 50 km/h needed to stop once the brakes are applied. The results are shown below:

Which type of road will provide the most friction for the car to stop?

When a bicycle is in motion, the force of friction exerted by the ground on the two wheels is such that it acts

Read the given statements and select the correct option.

Statement 1: While drawing a line on a paper, friction force acts on paper in the same direction along which line is drawn on the paper.
Statement 2: Friction always opposes motion.

Consider a vehicle going on a horizontal road towards east. Neglect any force due to air. The frictional force on the vehicle by the road

A box is given a push across the floor. It comes to stop shortly after. Which one of the following reasons explain why this happen?

When the applied force is doubled on an object and the object is still at rest, then friction becomes