# Free body diagram

Anonymous

Question description

a. The Earth orbiting the Sun

b. A car making a curve on a horizontal road

c. A ball on a string swinging in circles on a horizontal surface

d. A ball on a string swinging in circles in the vertical plane:

- at the top of the circle

- at the bottom of the circle

e. A ball on a string swung in circles in a horizontal plane in mid-air such that the plane of the circle is below the end of the string held at the centre of the circle.

f. A pilot in a plane making a vertical circle in mid-air:

- at the top of the loop (she is upside down at this position, as is the plane)

- at the bottom of the loop

2. Sometimes road surfaces have banked curves. Explain how this helps cars make turns more safely. Include a free-body diagram.

3. A rock of mass 200 g is attached to a 0.75 m long string and swung in a vertical plane.

a. What is the slowest speed that the rock can travel and still maintain a circular path?

b. What is the tension in the string at the bottom of the swing?

4. Kim has her coffee cup on her car's dash when she takes a corner with radius 4 m at 20 km/h. What is the minimum coefficient of static friction which would

allow the coffee cup to stay there without slipping?

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