Physics Unit 2 Packet 3 - Circular Motion and Gravity

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

• outwards
• towards the center
• tangent
• faster

Centripetal acceleration acts towards the ___________ of the circular motion

• center

• circumference

• the tangent

What object experiences uniform circular motion?

• A car speeding up as it turns left
• A car traveling around a roundabout at a constant speed
• A car slowing down as it crests a tall hill
• A car traveling down the road at a constant speed

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

• A
• B
• C
• D

Tags

NGSS.MS-PS3-1

When moving in a horizontal circular path, what direction is acceleration?

• In the opposite direction of motion

• Tangential to the circle in the direction of motion

• Outwards from the center of the circle

• Towards the center of the circle

If the radius of the string is .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

What causes centripetal acceleration?

• Change in magnitude

• Change in the direction of the velocity vector

• Change in angular displacement

• change in position

Imagine a child on a merry-go-round, spinning as it turns. If the child is holding a ball, then reaches out and releases the ball off the side of the merry-go-round, in what direction will it travel?

• Toward the center of the merry-go-round

• Directly opposite the center of the merry-go-round

• In a straight line tangential to the circular path of the merry-go-round

• Around in a circular path identical to how it was traveling prior to release

Answer explanation

While the child holds the ball, she exerts a force on it, causing it to change direction. After release, there is no longer a force being exerted (remember we chose to ignore gravity), and thus the ball will travel in a straight line of motion, continuing on its path from that moment.

Tags

NGSS.HS-PS2-2

An object which move in uniform circular motion must move with?

• constant speed

• constant direction

• constant velocity

When an object is in circular motion it is constantly changing its velocity.

• True

• False