Question

Soccer Practice. You are dragging a bag of soccer balls across a practice field with a constant velocity of 1.5 m/s. If the mass of the bag (and balls) is 4 kg, and your force on the bag is 28 N, determine the force of friction on the bag.

a) 4 N
b) 9.5 N
c) 28 N
d) 38.5 N

Answer 1

The force of friction on the soccer bag can be found using the equation: Force of friction = Force applied - Force of gravity. Substituting the given values, the force of friction is -11.2 N, indicating a force in the opposite direction of motion.

Step-by-step explanation:

To determine the force of friction on the bag, we can use the equation:

Force of friction = Force applied - Force of gravity

The force of gravity can be calculated using the mass of the bag and the acceleration due to gravity:

Force of gravity = Mass x Acceleration due to gravity

Substituting the given values, we have:

Force of gravity = 4 kg x 9.8 m/s^2 = 39.2 N

Therefore, the force of friction on the bag is:

Force of friction = 28 N - 39.2 N = -11.2 N

Since the force of friction always opposes the motion, the negative sign indicates the direction of the force. So the force of friction on the bag is 11.2 N in the opposite direction of motion.