A 10kg car travels at a constant speed of 20.0 m/s around a horizontal circular track. Which diagram correctly represent the direction of the car's velocity (v) and the direction of the centripetal force (Fc) acting on the car at a particular moment?

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NGSS.HS-PS2-1

At the instant shown in the diagram, the car's centripetal acceleration is directed-

• toward E

• toward N

• toward W

• clockwise

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NGSS.HS-PS2-1

Which of the following depicts the velocity of the bowling ball?

• A

• B

• C

• D

Which represents the acceleration of the ball?

• A
• B
• C
• D

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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

The diagram shows an object moving counterclockwise around a horizontal, circular track. Which diagram below represents the direction of both the object's velocity and the centripetal force acting on the object when it is in the position shown?

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At the position shown in the diagram, which arrow indicates the direction of the centripetal acceleration of the cart?

• A

• B

• C

• D

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NGSS.HS-PS2-1

What is Newton's First Law

• F = ma

• For every action there is an equal and opposite reaction.

• An object remains moving at a constant velocity (in a straight line at a constant speed) unless a net force acts upon it.

• Accelerated motion is cause by a lack of a net force acting in any direction.

The string breaks. Describe the motion of the ball correctly.

• It moves in a straight line.

• It continues to move in a circular motion

• It moves in a straight line at a tangent to the circle

• It continues to accelerate.

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NGSS.HS-PS2-1

If an object is moving in a circular motion it is moving at a constant speed. . so why is it not following Newton's 1^st Law

• There is no net force acting on the object.

• It's direction is constantly changing and so a net force has to be acting. Therefore by definition, F = ma, the object has to be accelerating.

• It's direction is constantly changing and so a net force has to be acting. Therefore by definition, F = ma, the object has to be moving at a constant velocity.

• It's direction is constantly changing and so a net force is not acting. Therefore by definition, F = ma, the object is not accelerating.