1. If a car goes around a curve at half the speed, the centripetal force on the car is...
a.) twice as big.
b.) four times as big.
c.) half as big.
d.) one-fourth as big.

2. What is the gravitational force between two trucks, each with a mass of 2.0 x 10^4 kg, that are 2.0 m apart?

3. The gravitational force between two masses is 36 N. What is the gravitational force if the distance between them is tripled? (G=6.673 x 10^-11 Nxm^2/kg^2).

4. A car goes around a curve of radius r at a constant speed v. What is the direction of the net force on the car?

Please show your work, the formula(s) used and the answer.

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While the solutions are given below in ascii text. I also attached two files with the equations typed more nicely, and an illustration regarding problem #4.

The file are identical in content, and only different in the format. One is in Word XP format while the other is in PDF format, ...

Solution Summary

The forces in a circular motion are analyzed. The gravitational force between two masses are given.

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... directed towards the centre of the circular path, hence ... must also act towards the centre (centripetal force). ... As per Newton's third law, the forces of action ...

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... it toward the center of the circular path ... by a reaction force, the centrifugal (Â“center-fleeingÂ”) force. The two forces are equal in magnitude and opposite ...