Asked by Katherine

A 4-kg sled sliding freely on an icy surface experiences a 2 _ N frictional force exerted by the ice and an air-resistive force of 0.5 N.
a. What is the net force acting on the sled?
b. What is the acceleration of the sled?
Answered by Marth
a.
Both friction and air resistance oppose motion. So the net force is -2N (friction) + -0.5N (air resistance) = -2.5N, where positive is the direction of motion.

b.
F = ma, so a = F/m. You know force and mass, a=?
Answered by esteban
a. -2.5
b. 0.625
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