# PHysics

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A dragster maintains a speedometer reading
of 100 km/h and passes through a curve with

Consider the following forces:
I) air drag pushing back on the car;
II) gravity pulling down on the car;
III) the ground pushing up on the car;
IV) friction pushing the wheels (and the car)
forward; and
V) friction pushing the wheels (and the car)
back.
Which force(s) act on the car?
1. I, III and V
2. I, II and III
3. II, III and IV
4. I, II, III and IV
5. I and II

• PHysics -

4. I, II, III and IV
Friction (or a banked road) also provides a centripetal (sideways) force to the tires.

That should also be mentioned, since they are talking about a car on a curve.

• PHysics -

A dragster maintains a speedometer reading
of 100 km/h and passes through a curve with a constant radius.

Which statement is true?
1. The dragster rounded the curve at a
changing velocity of 100 km/h.
2. The dragster moved along a straight line
at a constant velocity of 100 km/h.
3. The dragster rounded the curve at a
changing speed of 100 km/h.
4. All are wrong.
5. The dragster rounded the curve at a con-
stant velocity of 100 km/h.

• PHysics (Maria) -

Submit your question separately, not as an add-on to another person's question.

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