1) You are making a circular turn in your car on a horizontal road when you hit a big patch of ice, causing the force of friction between the tires and the road to become zero. While the car is on the ice, it

A) moves along a straight-line path away from the center of the circle.

B) moves along a straight-line path toward the center of the circle.

C) moves along a straight-line path in its original direction.

D) continues to follow a circular path, but with a radius larger than the original radius.

E) moves along a path that is neither straight nor circular.

DRAW and explain

2) When a car goes around a circular curve on a horizontal road at constant speed, what force causes it to follow the circular path?

A) the normal force from the road

B) the friction force from the road

C) gravity

D) No force causes the car to do this because the car is traveling at constant speed and therefore has no acceleration.

DRAW and explain

3) When a car goes around a banked circular curve at the proper speed speed for the banking angle, what force cause it to follow the circular path?

A) the normal force from the road

B) the friction force from the road

C) gravity

D) No force causes the car to do this because the car is traveling at constant speed and therefore has no acceleration.

DRAW and explain

4) A spaceship is traveling to the Moon. At what point is it beyond the pull of Earth's gravity?

A) when it gets above the atmosphere

B) when it is half-way there

C) when it is closer to the Moon than it is to Earth

Explain using Newton’s Law of Gravitation

5) A particularly scary roller coaster contains a loop-the-loop in which the car and rider are completely upside down. If the radius of the loop is 17.4m with what minimum speed must the car traverse the loop so that the rider does not fall out while upside down at the top? Assume the rider is not strapped to the car.

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6) The curved section of a horizontal highway is a circular unbanked arc of radius 680 m. If the coefficient of static friction between this roadway and typical tires is 0.36, what would be the maximum safe driving speed for this horizontal curved section of highway?

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