UCM Review 1

Calculate the amount of centripetal force it takes for a softball pitcher to rotate a ball with a velocity of 3 m/s if the ball weighs .12 kg and her arm is .65 meters long.

• .38
• 1.23
• .55
• 1.66 N

Tags

NGSS.HS-PS2-1

Which one is the right relationship when you are at the bottom of a Ferris Wheel ride?

• Fc= Fg-Fn

• Fc= Fn- Fg

• Fc= Wg

• Fc= Fn+ Fg

Tags

NGSS.HS-PS2-1

Bruno the bat flies at a speed of 0.5 m/s in circle of radius 1 m. What is his acceleration?

• 0.25 ms^-2
• 0.5 ms^-2
• 1 ms^-2
• 2 ms^-2

Tags

NGSS.HS-PS2-1

A particle P is moving in a circle with uniform speed. Which one of the following diagrams correctly shows the direction of the acceleration a and velocity v of the particle at one instant of time?

• A
• B
• C
• D

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

• up
• right
• down
• left

CIRCULAR MOTION PROPORTIONALITY:
A stopper is attached to a string and spun in a perfect circle.  If the mass of the stopper increases:

• the speed of the stopper will increase
• The acceleration of the stopper will increase
• The centripetal force on the stopper will increase

Tags

NGSS.HS-PS2-1

CIRCULAR MOTION PROPORTIONALITY:
Centripetal Force and the Radius of the circle are ___________________ related.

• directly
• inversely
• not

CIRCULAR MOTION PROPORTIONALITY:
A girl swings a toy plane in a perfect circle using a string.  If the length of the string increases but the speed of the plane does not, what will happen to the force on the plane?

• the force will increase
• the force will decrease
• the force will stay the same

CIRCULAR MOTION PROPORTIONALITY:
A girl swings a ball in a perfect circle using a string.  If she swings the ball twice as fast, what will happen to the force on the ball

• the force will increase
• the force will decrease
• the force will stay the same

Tags

NGSS.HS-PS2-1

CIRCULAR MOTION PROPORTIONALITY:
Centripetal force and the speed of an object moving in a circle are _____________ related

• inversely
• directly (speed must be squared)
• not