1. How does the change in momentum compare between a quick stop (collision) and a controlled stop (braking) from the same velocity? Why?

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Presentation transcript:

1. How does the change in momentum compare between a quick stop (collision) and a controlled stop (braking) from the same velocity? Why?

2. In a collision that stops a vehicle, how does the original velocity relate to the force experienced by vehicle and passenger? Explain your answer using the terms "impulse" and "time."

3. If you lengthen the time a change in velocity takes, will the force go up or down? Use the equation force = mass x change in velocity/time to support your response. Substitute some reasonable numbers for mass, velocity, and time to prove the effect.

1. (a) During a race, a 1200 kg car slowed down to 100 km/h (28 m/s) just before it hit a brick wall. It stopped in 1 s. What force was involved? Write down what you know. mass = ______ kg final velocity = ______ m/s starting velocity = ______ m/s time = ______ s What do you want to find out? Use the formula. change in velocity = final velocity - starting velocity = ______ m/s - ______ m/s = ______ m/s

(b) How much larger is this force than the force in the sample problem? Write down what you know. force in question 1(a) = ______ kgm/s2 force in sample problem = ______ kgm/s2 What do you want to find out? Use the formula. difference in forces = force in 1(a) - force in sample problem = ______ kgm/s2 - ______ kgm/s2 = ______ kgm/s2 State your findings.

3a. A 1500 kg car collides with a roadside barrier, and the car’s velocity changes from 28 m/s (100 km/h) to 0 m/s in 0.5 seconds. What force does the car experience?

A transport truck with a mass of kg and a car with a mass of 2000 kg are travelling at the same velocity (100 km/h) but in opposite directions. The truck is travelling to the left, and has a momentum of – kg.km/h. The car is moving to the right, and has a momentum of kg.km/h. What is the total momentum after the collision? In which direction will these vehicles move if they collide?