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