circular motion

Why do objects experience centripetal acceleration even though they can have a constant speed?

• Because they are speeding up as they move in a circle

• Because they are constantly changing direction and hence, velocity changes, and that net change is directed inward.

• Because they are constantly changing both speed and direction

• Because when you have 100 people pedaling, you can speed up more easily.

What's the centripetal acceleration of a .2 kg yoyo spun in a circle with a radius of .7 meters at a velocity of 3 m/s?

• 8.23 m/s²

• 10.54 m/s²

• 12.86 m/s²

• 17.39 m/s²

Tags

NGSS.HS-PS2-1

The time to complete one rotation or revolution is called

• period

• frequency

• orbit

• quantum

Tags

NGSS.HS-PS4-1

A car moves around a turn with a constant speed of 150 mph and is accelerating. This statement is...

• True, because the velocity is constant

• True, because it is changing direction

• False, because there is no centripetal force

• False, it should be moving in a straight line

Tags

NGSS.HS-PS2-1

Find Fc for a car on a racetrack. Radius of 250 m. Linear velocity is 55 m/s. Mass is 1540 kg.

• 1,900 N

• 5,400 N

• 18,600 N

• 145,000 N

Tags

NGSS.HS-PS2-1

The Earth and the Moon gravitationally attract each other. Which exerts the greater force on the other?

• The Earth exerts a greater force on the Moon

• The Moon exerts a greater force on the Earth

• They exert the same force on each other

• Depends on the phase of the Moon

Tags

NGSS.HS-PS2-4

Which of the following is the unit for centripetal force?

• J
• m/s²
• kg⋅m/s
• N

Tags

NGSS.HS-PS2-1

Determine the force of gravitational attraction between a 52.0-kg mother and a 3.0-kg child if their separation distance is 0.50 meters. 

Tags

NGSS.HS-PS2-4

A test car moves at a constant speed around a circular track.  If the car is 48.2 m from the track's center and has a centripetal acceleration of 8.05 m/s², what is the car's tangential speed?

• 19.7 m/s
• 5.99 m/s
• 0.17 m/s
• 388.01 m/s

As mass decreases, gravitational force does what?

• Increases
• Decreases 
• Remains the same
• Changes

Tags

NGSS.HS-PS2-4