Chapter+3,+Section+5

What do you think: The factors that determine the outcome are the velocity and mass. The person in the sports car would have more injuries because the truck has more inertia staying still.

Observations: The moving car stops as it hits the second, stationary car. The stationary car then moves forward with the momentum of the first moving car. The first car then also stops because it transferred all its energy to the stationary car.

2. Red car stops, blue continues on and blue seems to have same velocity.

3. Still happens with higher speed.

4. Double the mass, same thing happens.

5. Red car doesn't stop all the way. Red car is heavier and moves slower. When it hits the blue car, the blue car goes a lot faster than the red car.

How to find mass of cars:

1. Find momentum of the red. P= m x v

2. Use momentum of blue to find the blue car by dividing Vblue by momentum.

Physics Plus

1. Truck: P=mv 20,000= 1,200 kg x v V= 16 1/3 m/s

SUV: P=mv 20,000 = 1500kg x v V= 13 1/3 m/s

Bicycle: P=mv 20,000= 200 kg x v V= 100 m/s

Baseball: P=mv 20,000= .1 kg x v V= 200,000 m/s

Bowling Ball: P=mv 20,000= 4 kg x v V= 5,000 m/s

Physics To Go:

1. I expect that the car in motion will stop and the car stopped will move forward with the same velocity as the first car.

2. They will both come to rest.

5. What determines who gets knocked back is the velocity of each. The larger car obviously has a greater mass while the smaller car less mass. So the velocity would have the biggest effect.

6. Automobile: 10,000 kg x m/s P=MV

10,000= 10,000 kg x v V= 1 m/s It would need to travel at 1 m/s