Friction always acts in ................. (same direction as/opposite direction to) motion.

Does friction always oppose the motion?

The motion of a sphere moving on a rough horizontal surface changes from pure sliding (without rolling) to pure rolling (without slipping). In this process, the force of friction ( i ) intially acts opposite to the direction of motion and late in the direction of motion ( ii ) cause linear retardation ( iii ) causes angular acceleration ( iv ) stops acting when pure rolling begins

Three coils are placed infront of each other as shown currents in 1 and 2 are in same direction while that in 3 is in opposite direction. Match the following table

When a person walks on a rough surface, the frictional force exerted by surface on the person is opposite to the direction of his motion. It is the force exerted by the road on the person that causes the motion.

The acceleration due to gravity is always down word i.e., along the -ve y direction can be choose this direction as the positive direction for the acceleration due to gravity

A body is in uniform motion if it covers equal distances in equal intervals of time ………….. .... (in any direction/in a specified direction).

Assertion :- When a man climbs the rope friction force acts in downward direction. Reason :- Friction force opposes relative motion ot tendency of relative motion between two contact surfaces.

Wavefront of a wave has direction with wave motion

The buoyant force acts ...... (along/opposite to ) the direction of gravity

Assertion: In projectile motion, the acceleration is constant in both magnitude and direction but the velocity changes in both magnitude and direction. Reason: When a force or accelration is acting in an oblique direction to the direction of velocity then both magnitude and direction of the velocity may be changed.