Advantages of Disadvantages of friction

Why does a ball stops/slows down on its own ?

• because of gravity

• because of friction

• because muscular force

• because of magnetic force

Why it is difficult to walk on a wet floor than on a dry floor?

• Because of contact force

• Because of magnetic force

• Because of gravitational force

• Because of less friction

What do we apply when there is a lot of friction on machine parts ?

• sand

• grease

• shampoo

• powder

Which of the following is an effect of friction?

• It slows down a moving object.

• It changes the shape of an object.

• it makes a moving object move faster.

• it causes a moving object to change its direction.

Which of the following activities are difficult to do without frictional force?

• Keep an object in position and sharpening a knife.

• Skating on ice and eating

• Drinking some water and eating

• Eating only

Which type of friction is shown in the picture?

• rolling

• fluid

• static

• sliding