What Are Useful Effects Of Friction?

Friction helps to hold the nails.

Friction is useful when

a) lighting a match
b) applying the brakes on a car
c) writing

Friction is helpful in many everyday instances. It stops cars, motorcycles, bicycles, trains, buses and other vehicles through the friction created by the brakes. Basketball players use it to make quick turns on the court (squeaking shoes=friction). The space shuttle uses friction to slow down from an orbital speed of 17,400 miles per hour to a landing speed of a couple hundred miles per hour. Friction helps people to eat in a hurry when a microwave oven is used. The microwaves excite the water molecules in the food, causing them to vibrate. As the food particles rub against each other they generate heat. Try rubbing your hands together very hard for the same amount of time the microwave oven is running, and you'll experience friction heating up your hands.

Driving.