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Physics > p9 > Flashcards

p9 Flashcards

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1
Q

axis

A

straight line around which rotation takes place

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2
Q

centripetal force

A

force required to maintain circular motion

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3
Q

centrifugal

A

apparent force that acts outward on an object moving around a center

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3
Q

linear speed

A

distance moved per unit of time

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4
Q

revolution

A

object turns around an external axis orbit

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5
Q

rotation

A

object turning around its own axis spin

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6
Q

rotational speed

A

the number of rotations per unit of time rpm

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7
Q

tangential speed

A

speed of something moving along a circular path

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8
Q

Who has a faster tangential speed, a person near the middle of a merry-go-round or near the outside edge?

A

The person on the outside edge

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9
Q

Who has a faster rotational speed, a person near the middle of a merry-go-round or near the outside edge?

A

Neither, they’re the same

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10
Q

Is the Earth revolving or rotating around the sun?

A

The Earth is revolving around the sun (outside axis)

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11
Q

Is the Earth revolving or rotating around its axis?

A

Rotating

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12
Q

When making a tight turn in a car why does your body get pushed in the opposite direction?

A

Centrifugal force - the car is turning but you’re trying to remain in a straight line, so you’re body is being “pushed outward”

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13
Q

Why is an object that is moving in a circle also accelerating?

A

Because it’s turning, since acceleration is changing direction and speed

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14
Q

What is the only thing that can cause an object to accelerate?

A

Force

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15
Q

How can we create artificial gravity for astronauts?

A

By rotating them around very fast

16
Q

Name the three things we talked about that can be the cause of the centripetal force.

A

Friction, like when cars turn; Tethered, like a bucket of water tied to a string and spun around; or gravity, like the moon orbiting the Earth.

Physics (11 decks)

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