Why do cyclists bend over their bicycles like in the picture below\" (select one

Question

Why do cyclists bend over their bicycles like in the picture below" (select one correct answer) To reduce the effects of air resistance by decreasing their area exposed as they move through the air To increase the effects of air resistance by decreasing the area exposed as they move through the air reduce the effects of air resistance by increasing the area exposed as they move through the air. Aircraft that need to go very fast have aerodynamic designs. These designs will reduce the acting on the aircraft and allow it to achieve a higher Why do some aircraft need a parachute to help them slow down and stop when landing? Know that Elastic materials are those that restore their original shape What is an elastic material? What do we call a material that can restore its shape? An material.

Explanation / Answer

87) Option (a) is correct because this helps in reducing projected area experiencing air resistance and hence them in speeding up

88) i)air resistance(drag) ; speed

ii) using parachute increases the air resistance force considerably since the projected area increases. This helps in faster slowing down of the aircraft. Parachute is used generally for emergency landing

89) Elastic material is a material which when unloaded restores its original shape and size.

90) elastic

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