UCM & UG

What happens to an object's speed as the radius decreases?

• It increases.
• It decreases.
• It remains unchanged.

Tags

NGSS.MS-PS3-1

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

At the top of a roller-coaster loop, gravity and the normal force point in opposite directions.

• True
• False

Tags

NGSS.HS-PS2-1

If you went to the moon, would your weight change?

• Yes
• No
• Maybe

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

What is the force that causes centripetal acceleration when a car goes around an unbanked curve?

• Friction
• Gravity 
• Normal
• Tension

What is the force that causes the centripetal acceleration when a race car goes around a banked curve?

• Tension
• Gravitational
• Normal
• Friction

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

• outwards
• towards the center
• tangent
• faster

Which is an imaginary force?

• Friction force

• Normal force

• centrifugal force

• centripetal force

What causes acceleration during circular motion?

• changing speed

• changing direction

• air resistance

• magic

A 5.0kg bucket of water is swung in a circle with radius of 0.7m at a constant speed of 2.0m/s. The magnitude of the centripetal force on the bucket of water is approximately

• 5.7N

• 14N

• 29N

• 200N