p9

Question 1

axis

Answer 1

straight line around which rotation takes place

Question 2

centripetal force

Answer 2

force required to maintain circular motion

Question 3

centrifugal

Answer 3

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

Question 3

linear speed

Answer 3

distance moved per unit of time

Question 4

revolution

Answer 4

object turns around an external axis orbit

Question 5

rotation

Answer 5

object turning around its own axis spin

Question 6

rotational speed

Answer 6

the number of rotations per unit of time rpm

Question 7

tangential speed

Answer 7

speed of something moving along a circular path

Question 8

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

Answer 8

The person on the outside edge

Question 9

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

Answer 9

Neither, they’re the same

Question 10

Is the Earth revolving or rotating around the sun?

Answer 10

The Earth is revolving around the sun (outside axis)

Question 11

Is the Earth revolving or rotating around its axis?

Answer 11

Rotating

Question 12

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

Answer 12

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

Question 13

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

Answer 13

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

Question 14

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

Answer 14

Force

Question 15

How can we create artificial gravity for astronauts?

Answer 15

By rotating them around very fast

Question 16

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

Answer 16

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.