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Often times, success in physics demands that you have the proper approach - a good game plan. A good game plan for this question would be to:
- First, identify if the forces are balanced or unbalanced; and if unbalanced, determine the direction of the unbalanced force (see Think About It section below). This will allow you to eliminate several choices from among the ten diagrams.
- Second, use your understanding of the various force types to determine if there is a force in each direction - up, down, right, left. This requires that you have a good understanding of the different types of forces and when they are present and absent (use the link in the Hot Link section if necessary). This second step allows you to reduce the number of choices to one.
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A common misconception among physics students is the belief that a rightward moving object must be experiencing a rightward force. But don't be fooled! If an object is moving to the right and speeding up then there must be more right force than left force acting upon it. If an object is moving to the right and slowing down then there must be more left force than right force acting upon it. And if an object is moving to the right with a constant speed then there must be the same amount of right force as left force acting upon it (if present at all).
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A physics question often contains a short phrase or word that serves to provide a hint or clue that might steer you in the right direction. In this question, the clue is in the word "coasts". Including this phrase in the question warns the student that there is no forward pushing force on the sledder. The sledder is just coasting or gliding without pushing himself forward or being pushed forward. Thus, do not select a diagram with a rightward force.
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