Circular Motion and Gravity

What is the direction of the velocity at point B, if the ball is revolving clockwise?

• up

• right

• down

• left

The velocity is always _____ to the line of a circle.

• outwards

• towards the center

• tangent

• perpendicular

What's the centripetal acceleration of an object traveling 2.3 m/s around a circle of diameter 0.6 m?

• 5.00 m/s²

• 17.6 m/s²

• 10.0 m/s²

• 8.81 m/s²

If the radius of the string is 0.3 meters long and the stopper makes 5 revolutions per second, what is the speed of the stopper? (Hint: C=2πr)

• 9.4 m/s

• 6.8 m/s

• 11.7 m/s

• 3.5 m/s

Centripetal acceleration always points

• in the direction of the object's motion

• in the opposite direction of the object's motion

• towards the center of the circle

• towards the outside of the circle

The time taken for one complete cycle from starting point back to starting point is called the

• period

• frequency

• angular velocity

• amplitude

Tags

NGSS.HS-PS4-1

Which of the following depict the speed of the blowing ball?

• A

• B

• C

• D

Tags

NGSS.MS-PS3-1

Which of the following increase the centripetal force?

• Increasing the radius
• Increasing the velocity
• Decreasing the mass
• Decreasing the acceleration

Calculate the amount of centripetal force it takes for a softball pitcher Jenny Finch to rotate a ball with a velocity of 31 m/s if the ball weighs .12 kg and her arm is .65 meters long.

• 177.4 N

• 57.2 N

• .572 N

• 1.774 N

Tags

NGSS.HS-PS2-1

What states that "every object in the universe attracts every other object"?

• Law of Universal Gravitation

• Newton's First Law of Motion

• Law of Conservation of Mass

• Law of Inertial Reference

Tags

NGSS.HS-PS2-4