8. The dog sled will experience positive acceleration if:
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they add bags to the sled.
they add a dog to the sled.
they add a person to the sled.
all of the above
all of the above
To determine which option would cause the dog sled to experience positive acceleration, we need to understand the concept of acceleration. Acceleration is defined as the rate of change of velocity. In simpler terms, it is the increase in speed or change in direction of an object.
In the context of the dog sled, adding bags, dogs, or a person to the sled would increase its mass. According to Newton's second law of motion, the force required to accelerate an object is directly proportional to its mass.
So, if the mass of the sled increases by adding bags, dogs, or a person, a greater force would be required to accelerate the sled. To accomplish this, the driver would need to apply a greater driving force.
Therefore, the correct answer is: "all of the above" - adding bags, a dog, or a person to the sled would result in positive acceleration.