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Suppose you are sitting in a car that is speeding up. Draw well-separated force diagrams of the following objects:

• your own body;
• the seat in which you are sitting (apart from the car);
• the car (apart from the seat);
• the road surface where the tires and the road interact.

Assume the car has rear wheel drive.

• Describe each force in words; show larger forces with longer arrows.
• Identify the third law pairs.

Explain carefully in your own words how the force imparting acceleration to the car originates.

Page last modified October 15, 2002: D31