# Forces in a circular motion

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.