LET'S CONNECT
science
Explain the presence of gravity and. friction in the following;
1.) Athletes used shoes with cleats
2.)swimmers used head caps and skin -tight suits.
3.)ballet dancers put sticky powder on their shoes
4.)a ball thrown up in the air goes down
5.) parachute is used in skydiving
6.)it's easier to walk down stairs than to go upstairs
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Answer:
1. spikes increase the surface of the shoes and make it rough which results in an increase friction.
2. they reduce friction and drag in the water, increasing the afficiency of the swimmers forward motion.
3. to increase friction when doing a pirouette, the dancers can apply water to the soles of her ballet shoes. this will make her shoes more sticky, so her shoes will stick to the ground more and thus increase the friction.
4 it is affected by the throw (which gives the initial upward velocity) and gravity which applies a constant negative acceleration.
5. the parachute increases the body's surface area, and this increase air resistance slows the body in motion.
6. the gravitational force is in the downward direction and you are doing work against gravity.