Physics, Thursday Bell Ringer 12.14.17

At the top of a rollercoaster loop, In what directions do gravity and the normal force point. A free body diagram is useful to help answer the question

• gravity: down, normal force: up

• gravity: down, normal force: down

• gravity: down: normal force: direction of motion

Tags

NGSS.HS-PS2-1

What is the SI unit for circumference?

• meter
• pi
• inches
• kilometer

Centripetal force is...

• the resultant force acting on a body moving at constant speed in a circle 
• the outwards force acting on a body moving at constant speed in a circle 

Centripetal acceleration acts towards the ___________ of the circular motion

• centre
• circumference

Tags

NGSS.HS-PS2-1

A horse gallops around a circular arena.  The centripetal force on the horse is ___.

• directed outward
• tension
• directed toward the center of the arena
• 9.8 N

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NGSS.HS-PS2-1

Objects moving with constant speed in a circular path experience

• constant motion
• linear acceleration
• angular acceleration
• centripetal acceleration

True or False: Centripetal acceleration causes circular motion.

• True
• False

Tags

NGSS.HS-PS2-1

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

Why do objects experience centripetal acceleration?

• Because they are speeding up as they move in a circle
• Because they are constantly changing direction and the 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.

Tags

NGSS.HS-PS2-1

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

• Friction
• Gravity 
• Normal
• Tension

Tags

NGSS.HS-PS2-1