pling learning Lucy boards a crowded bus as it sits in the station. There are no

Question

pling learning Lucy boards a crowded bus as it sits in the station. There are no available seats, so Lucy stands in the rd and picks up speed, Lucy holds the pole tightly to avoid falling over backward. While the bus is speeding up, what is the direction of the total force (if any) on Lucy? O forward O backward O the total force is zero As the bus drives down a straight road at a constant speed, Lucy has no trouble keeping her balance. During this time, what is the direction of the total force (if any on Lucy? O forward O backward O the total force is zero The bus comes to a sudden stop at a red light, and Lucy grips the pole ti forward. During this time, what is the direction of the totaltorce (if any) on Lucy? O forward O backward O the total force is zero

Explanation / Answer

1. Total force on Lucy is FORWARD: When the bus is speeding up (since it is accelerating in forward direction F = ma).

2. Total force on Lucy is ZERO: When the bus is moving with constant speed there is no acceleration (since speed is not changing, a=0, and F = ma =0).

3. Total force on Lucy is BACKWARD. When the bus comes to a suddent stop v = 0 from v = +ve (it has deleratated or acceleration is negative, thus F = ma = -ve or in backwards direction.)

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