Which of the following is a method to increase friction?

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The soles of shoes are grooved to promote friction and avoid sliding.

Vehicle tyres are designed with treads to increase friction and prevent vehicles from slipping on wet surfaces.

Players and athletes have spikes in their shoes to increase friction and prevent slippage.

All the above

answer is D.

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Detailed Solution

In the given options, the fourth option is correct.
Friction is the force that opposes the relative motion between two surfaces of objects when they come in contact. The frictional force is the force which resists sliding or rolling one solid object over the other. The frictional force will always slow down a moving body.
The soles of the shoes are grooved to promote friction and avoid sliding. Vehicle tyres are designed with treads to increase friction and prevent vehicles from slipping on wet surfaces. Players and athletes have spikes in their shoes to increase friction and prevent slippage. All the options given are used to increase friction.

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