FOR REGENTS CLASS ONLY Assessment 7.3 due Thursday Feb 14 Reworked enzyme exam due Friday Feb 15 Practice regents 1 due Wednesday Feb 21 Any questions? Email me.

force and motion homework

Here is the next set of homework. #29 What data convinces you that one vehicle is safer than another? 73 #30 Why do you think speeding is a factor in about 20% of fatal car accidents? 74 #31 Do cars usually change speed instantaneously? 75 #32 Draw a picture of forces at work 76 #33 The average speed of a car that travels 500 Km in 5 hours is 77 #34 Newton’s second law of motion states that force is equal to mass times _____? (F= M x ?) 78 #35 Do you think a driver in a lighter or a heavier car is more likely to be able to avoid an accident? Why? 79 #36 Give three examples of Newton’s law in everyday life. Name the law. 80 #37 Draw a force diagram showing a tug of war between 7th and 8th grade 81 #38 Why do you think speeding is a factor in a high percentage of car accidents? 82 #39 You hear that when a car goes twice as fast, its braking distance doubles. Do you agree or disagree? Use evidence from this investigation to support your ideas. 83 #40 Since the 1920’s, the rate of fatalities has dropped steadily. However, the rate has been about the same for the past 20 years. Why do you think this is? 84 #41 How do engineers know if a safety feature works well or not? 85 #42 Why do think pickups and SUVs tend to roll over more often than passenger cars of similar mass? Explain in terms of center of mass. 86 #43 Americans 15–24-years old have almost twice the risk of dying in a motor vehicle accident as 25–34-year-old Americans. Why do you think the risks are so different for these two age groups? 87