Airbags in cars can greatly reduce the injury to the driver of a car in a collision because they _______.
A. increase the time and decrease the force of the collision
B. decrease the time and increase the force of the collision
C. decrease the time and decrease the force of the collision
D. increase the time and increase the force of the collision
3. Impulse is _____.
A. a vector quantity
B. a scalar quantity
C. both a vector and a scalar quantity
D. neither a vector or a scalar quantity
4. While driving down the highway a bug splatters into your windshield. The change in momentum would _______.
A. be greater for the bug
B. be greater for your car
C. depend on wind speed
D. be the same for the bug and the car
Airbags in cars can greatly reduce the injury to the driver of a car in a collision because they _______.?
The CORRECT answers are A, A, and D respectively.
For number 2, the answer is A because a change in momentum is equal to force times time. In a crash, you're going to go from your initial momentum to zero, but you can change momentum in a short period of time (which requires a huge force) or you can change momentum over a longer period (which requires less force). The purpose of the airbag is to increase the time over which you slow down - instead of hitting a hard steering wheel or dashboard, you hit a soft airbag. More time to slow down = less force = less chance of serious injury or death.
Impulse is a change in momentum. Momentum is a vector quantity (meaning it has both magnitude and direction) and so is the CHANGE in momentum.
The change in VELOCITY would be bigger for the bug, but due to the law of conservation of momentum, the momentum change would be the same for the bug and the car.
I hope that helps. Good luck!
Airbags in cars can greatly reduce the injury to the driver of a car in a collision because they _______.?
A
A
A
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