gravity and circular motion

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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Tags

NGSS.HS-PS2-1

As the car goes around the curve, the centripetal force is directed--

• toward the center of the circular curve

• away from the center of the circular curve

• tangent to the curve in the direction of motion

• tangent to the curve opposite the direction of motion

Tags

NGSS.HS-PS2-1

Which is true about centripetal force and centripetal acceleration?

• The centripetal acceleration is always pointing toward the center of an orbit and the centripetal force is always pointing outward

• The centripetal acceleration is always pointing outward from the center of an orbit and the centripetal force is always pointing inward

• The centripetal acceleration is always pointing toward the center of an orbit and the centripetal force also pointing toward the center but in a totally different location

• The centripetal acceleration is always pointing toward the center of an orbit and the centripetal force also pointing toward the center and in the same exact location as the centripetal acceleration

A toy train moves in a circular track with a velocity of 2.2 m/s, the axis of rotation is 1.8 m. What is its centripetal acceleration?

• 1.22 m/s²

• 0.81 m/s²

• 2.69 m/s²

• 1.47 m/s²

Tags

NGSS.HS-PS2-1

What happens to the centripetal force exerted on an object if you triple the velocity?

• it increases to 3X
• it decreases to 6X
• it increases to 6X
• it increases to 9X

Calculate the centripetal force required to make a 5 kg ball move 4 m/s in a circle with a radius of 2 m.

• 10 N
• 20 N
• 30 N
• 40  N

Tags

NGSS.HS-PS2-1

A Ferris wheel has a radius of 50 meters and takes approximately 800 seconds to make a full circle. Determine the tangential speed of riders (in m/s)

• .39 m/s

• 314 m/s

• 40,000 m/s

As the radius of a spinning object decreases, acceleration

• increases

• decreases

• stays the same

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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Tags

NGSS.HS-PS2-1

A curved groove is place on the top of a level table as shown in the diagram. A ball is pushed in the groove at P so that it leaves at Q. Which picture shows how the ball will move when it leaves the groove at Q?

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Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2