The dog sled will experience positive acceleration if:
they add bags to the sled.
they add a dog to the sled.
Athey add a person to the sled.
all of the above
all of the above
The correct answer is: all of the above.
Adding bags to the sled will increase the total mass of the sled, resulting in greater inertia. When a force is applied in the forward direction to overcome the sled's resistance to motion, the sled will experience positive acceleration.
Adding a dog to the sled will increase the force pulling the sled forward. This additional force will help overcome the resistance to motion and result in positive acceleration.
Adding a person to the sled will also increase the force pulling the sled forward, contributing to positive acceleration. Additionally, a person's weight will increase the total mass of the sled, leading to greater inertia and a greater resistance to motion.
Therefore, all of these actions will contribute to a positive acceleration of the dog sled.
To determine when the dog sled will experience positive acceleration, we need to understand the concept of acceleration and its relation to the factors mentioned in the options.
Acceleration refers to the rate at which an object's velocity changes over time. It is defined as the change in velocity divided by the change in time. Velocity, on the other hand, is the rate at which an object's position changes over time.
Adding bags to the sled, adding a dog to the sled, or adding a person to the sled all increase the total mass of the sled. According to Newton's second law of motion, the acceleration of an object is inversely proportional to its mass when the force applied is constant. This means that a greater mass will result in lower acceleration.
Therefore, based on this understanding, we can conclude that the dog sled will experience positive acceleration when they add bags to the sled, add a dog to the sled, or add a person to the sled.
In summary, the correct answer is "all of the above" as all of these actions increase the total mass of the sled, thereby decreasing the sled's acceleration.