PHYSICS [1 Mark Question Answer]

The unit of force in Standard International (S.I.) system is newton (N). 1 newton is the force required to lift the mass of 100 g vertically upward.

The SI unit of force is newton. It is defined as the force that is required to accelerate a mass of 1 kg at the rate of 1 m/s2.

The fibrous surface of the jute thread has high friction, so the knot doesn’t slip easily. Silk thread is smooth and has low friction.

Tyre has a groove that increases the friction between them and the road. This enables the vehicle to make a firm grip on-road and prevent slipping. Grooved offers more friction to the ground which gives a better grip.

Frictional force offers the resistance to the applied force opposing its motion. Thus, it always acts in the direction opposite to that of the object in motion i.e. towards west.

The frictional force comes into play when the two surfaces in contact experience a relative motion.

The force which acts opposite to the direction of motion of a body is known as the force of friction. For example, a ball rolling on a ground stops after sometime because of frictional force acting between the ground and the ball.

The rough surface offers very high friction.

The boats are streamlined to give them least friction.

Force of friction always acts in the opposite direction of applied force.

Force of friction is an example of consequential force.

The tyres of vehicles are provided with deep grooves so as to increases friction between the road and tyres.