The dogsled in this image moves at a constant speed in a straight line. Which of the following is true?
The forward pull of the dogs balances the backward pull of friction
The backward pull of the friction is larger than the forward pull of the dogs
There is not enough information to answer this question
The backward pill of friction is smaller that the forward pull of the dogs.
There is not enough information to answer this question.
Carla demonstrates Newton’s First Law of Motion by slowly pushing a book across a table. The book moves at a constant rate of speed so long as she is pushing it.
Which of the following is NOT true.
Her push balances the force of friction
The upward force exerted by the table balances the book’s weight
There is an unbalanced force on the book, acting in the direction of motion
The forces acting on the book are all balanced.