Question

D. Very Short Answer Type Questions
1. If you spill a bucket of soapy water on the
floor, would it be easier or more difficult
to walk on it? Why?
2. Why more force is needed to push a
lighter box than to push a heavier box?
3. Name the three types of friction?.
4. Ball bearing is used to convert static
friction into what type of friction?
5. What is done to the tyres of vehicles to
increase the friction?
​

Answer 1

1. When soap water is spilled on the floor, the friction exerted by the floor is reduced. Hence, the feet will not get a proper grip on the floor and one tends to slip, making it difficult to walk.
2. We can push a lighter box easily than a heavy box on the same floor because of friction. The heavier the object, the more friction is applied, thus making it difficult to push a heavier box.
3. The reason we are able to control cars at all is because of friction between the car's tires and the road: more accurately, because there are three kinds of friction: rolling friction, starting friction, and sliding friction.
4. Ball bearing is used to convert static friction into rolling friction
5. A series of patterns made into the surface of a tyre is called tread.
6. 1)Grooves are made in the soles of shoes to increase friction and prevent slipping. ...
7. 2)Treads are made in the tyres of vehicles to increase friction and prevents skidding of vehicles on wet road.

• it's a bit easy