AP Physics 1 : Specific Forces
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Example Questions
Example Question #781 : Newtonian Mechanics
A 
This question tests your understanding of the concept of centripetal force. Centripetal force is a force that maintains a body's circular travel along a curved surface and points inward towards the center of the curve from each point that the body travels along. Centripetal force is calculated as follows:
Therefore the centripetal force on the car is 
Example Question #221 : Specific Forces
Nicola is attempting to create a single tiered mobile as shown. She has a wooden dowel (
If Nicola places ornament 
Note: figure not drawn to scale.
Let's use the midpoint as our point of reference. With that said, 
Our main equation is this:
Where 
Now let's plug in our numbers, remember about our negative/positive sides!
This should give us
Now, because this number is negative, we know it's to the left of our midpoint (if you chose to set up your -/+ sides opposite of how we did it, your answer will be positive). Regardless of the outcome, this measurement is meant to be taken from object A to the midpoint. Well, do any of our answers have either (+) or (-) 
One side is
Think about it logically too (use your pencil). The heavier end of a pencil usually has a bulky eraser on it (just like the bulkier object on the left). Try holding the pencil at the tip's end, and then gradually try balancing it in the same manner as you move closer to the eraser.
ALSO NOTE: the question states the weight of the dowel as well. But look we didn't even need it. Sometimes the AP exam will give you some aspects in the question to distract you.
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