Conceptual Example 1 Expt 1: Cart on air track at rest. Constant force acts for short time & gives cart a certain speed. Expt 2: Same conditions, but force.

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Presentation transcript:

Conceptual Example 1 Expt 1: Cart on air track at rest. Constant force acts for short time & gives cart a certain speed. Expt 2: Same conditions, but force half as large as in Expt 1. Question: To reach same final speed as Expt 1, this force must act for a time which is: 1. 4 times as long as in Expt 1, 2. 4 times as long as in Expt 1, 3. Equal to the time in Expt 1, 4. Half as long as time in Expt 1, 5. A quarter as long as in Expt 1

Conceptual Example 2 Expt 1: Cart on air track at rest. Constant force acts for short time & gives cart a certain speed. Expt 3: Another cart, twice the mass of that in Expt. 1. Same force for same time as in Expt 1. Question: Final speed of heavier cart is: 1. One fourth that in Expt 1. 2. 4 times that in Expt 1, 3. Half that in Expt 1, 4. Double that in Expt 1, 5. Same as in Expt 1

Conceptual Example 3 Expt 1: Cart on air track at rest. Constant force acts for short time & gives cart a certain speed. Expt 4: Same cart, but initially cart is already moving in direction of force. Exert same force for same time as in Expt. 1. Question: Increase in speed of cart is: 1. Equal to 2 times initial speed. 2. Equal to square of initial speed. 3. Equal to 4 times initial speed. 4. Same as in Expt 1, 5. Can’t be determined from info provided