Different surfaces in real life (non-statutory) | Exit Quiz | Oak National Academy

Which of the following can be caused by friction forces?

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Answer explanation

Heat and grazes on skin can both be caused by friction forces. Heat can be created when surfaces rub against each other and grazes on skin could be caused when someone hits a rough surface with a part of their body.

When scientists and engineers design products, they choose materials that are suitable based on their ___.

Answer explanation

When scientists and engineers design products, they choose materials based on their properties. For example, wood is often used for making desks because it is hard and strong.

A large amount of friction force can be helpful for which two of the following products?

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Answer explanation

High friction forces can be helpful for climbing shoes as it can help the wearer grip the surface of the rock. It can also be useful for goalkeeper gloves as it allows the goalkeeper to grip onto the ball.

When I rub the palms of my hands together, this creates friction force, and I can feel ___.

Answer explanation

When two surfaces touch and move over each other, large amounts of friction can create heat.

When products are made, materials are chosen based on their properties. Which two of these products would need a high friction material?

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Answer explanation

High friction is needed for a tug-of-war rope to grip, and to create the heat to light matches. Low friction is needed for roller blade wheels to move easily over surfaces and for people to glide down slides easily.

In which sport would friction forces be unhelpful?

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Answer explanation

Speed skaters need to move over the surface of the rink as quickly as possible. Friction forces are unhelpful as they try to slow the skater down. Speed climbers and sprinters both need lots of friction forces for grip.