The force of friction always works in the opposite direction to the movement. So, friction occurs when two surfaces stick to each other a little. Friction always slows a moving object down, b… 查看更多內容

Where do you think, you can walk easily? On a rough surface or a smooth surface? If you are unsure about your answer, let’s ask the question in a different way. Where do you think you can w… 查看更多內容

Driving a motor car or riding a bike would be impossible without friction. Tyres grip the road by friction and … 查看更多內容

Shoe treads Have you ever noticed the carved patterns underneath your shoes? Your answer should be yes. So, why are soles of shoes designed with these carved patterns? We call thes… 查看更多內容

Examples of less friction How can less friction be useful? So, what is the solution to reduce the friction on moving parts of machines? As you know, when the moving parts of machines rub on each other, they are worn away quickly … 查看更多內容

How can more friction be useful? Walking You couldn’t walk without friction. Friction prevents the soles of y… 查看更多內容

Imagine walking on a slab of ice! It is really hard as there is less friction between your shoes and the slab of ice. So, definitely you need extra care wh… 查看更多內容

How would you feel when you rub your hands together faster? If you have not done it yet, here’s the chance! Rub your hands together faster and see how you would feel. Yes, you de… 查看更多內容

Skiers wax their skis to cut down friction.  Also, skis are designed smooth and narrow to reduce friction. This allows skiers to slide easily across the snow. 查看更多內容