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5/29 MCQs for:

MOTION: Circular

A pilot executes a vertical dive then follows a semi-circular arc until it is going straight up. Just as the plane is at its lowest point, the force on him is

More than mg, and pointing up.

Less than mg, and pointing down.

Less than mg, and pointing up.

More than mg, and pointing down.

What force is needed to make an object move in a circle?

Static friction.

Weight.

Kinetic friction.

Centripetal force.

A pilot makes an outside vertical loop (in which the center of the loop is beneath him) of radius 3200 m. At the top of his loop he is pushing down on his seat with only one-half of his normal weight. How fast is he going?

625 m/s.

5.0 m/s.

125 m/s.

25 m/s.

A roller coaster car is on a track that forms a circular loop in the vertical plane. If the car is to just maintain contact with track at the top of the loop, what is the minimum value for its centripetal acceleration at this point?

g upward.

2g upward.

0.5g downward.

g downward.

What is the centripetal acceleration of a point on the perimeter of a bicycle wheel of diameter 70 cm when the bike is moving 8.0 m/s?

91 m/s².

2.1 x 10² m/s².

1.8 x 10² m/s².

2.7 x 10² m/s².