8. The dog sled will experience positive acceleration if:
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a they add bags to the sled.
b they add a dog to the sled.
c they add a person to the sled.
d all of the above
d) all of the above
If bags, dogs, or people are added to the dog sled, the total mass of the sled will increase. According to Newton's second law of motion, F = ma, where F is the net force acting on an object, m is the mass of the object, and a is the acceleration of the object. In this case, if the force applied by the dogs remains constant and the mass increases, the acceleration will be positive.
d) all of the above
To determine which scenario would result in positive acceleration for the dog sled, we need to understand what acceleration is. Acceleration refers to the change in velocity over time. If the velocity is increasing, the acceleration is considered positive.
Now let's evaluate each option given:
a) If they add bags to the sled: Adding bags to the sled increases its mass, which would make it harder to move and thus potentially decrease its velocity. Therefore, adding bags to the sled would not result in positive acceleration.
b) If they add a dog to the sled: Adding a dog to the sled would not directly affect its acceleration. The presence of a dog alone does not change the forces acting on the sled.
c) If they add a person to the sled: Adding a person to the sled would increase the total mass, which would require more force to maintain or increase the velocity. This increase in force could result in positive acceleration.
Based on our analysis, the correct answer would be option c) "they add a person to the sled." Adding a person to the dog sled would likely result in positive acceleration since it would require additional force to overcome the increased mass of the sled.
Note: It is essential to keep in mind that this answer assumes no other external forces are acting on the dog sled, such as friction or air resistance.