General questions: A dog is standing in the bed of a pickup truck. The bed is coated with ice, causing the force of friction between the dog and the truck to be zero. The truck is initially at rest, and then accelerates to the right, moving along a flat road. As seen from a stationary observer (watching the truck move to the right), the dog
A) does not move left or right, but the back of the truck moves towards the dog.
B) moves to the right, but not as quickly as the truck is moving to the right, causing it to slide towards the back of the truck.
C) moves to the right at the same rate as the truck, so it doesn't slide.
D) moves to the left, as the truck moves to the right, causing the dog to slide towards the back of the truck.

Question

Quizplus · Accepted Answer

Since there is no friction between the dog and the truck bed, the dog remains stationary relative to the ground as the truck accelerates to the right. This makes it appear as if the back of the truck moves towards the dog from the perspective of a stationary observer.

General Questions: a Dog Is Standing in the Bed of a Pickup