4. True / Microchips Have Many Tiny Circuits on Them That Move Data Around Very Fast
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Lesson Check 1
1. microchip
2. world wide web
3. technology
4. true / microchips have many tiny circuits on them that move data around very fast
5. true / doctors use x-rays to see bones. MRI scans and tomography help doctors see bones and other parts inside a person’s body.
6. Stone tools allow people to solve the problem of working with materials that are too hard to work with with their hands. Sharp sticks allow people to solve the problem of poking at something, picking something up, or turning something over without hurting their hands.
Lesson Check 2
1. skeletal system
2. muscular system
3. prosthetic limb
4. false / a prosthetic limb is not made of real muscles and bones, but is made of metals and plastics that do not look like a person’s real hand.
5. true / a modern prosthetic leg can bend and is moveable to help a person walk and even run.
6. Prosthetic limbs have parts that allow people to move them in ways they would using a real limb. Prosthetic limbs also often look like real limbs.
Lesson Check 3
1. an early version or model of a product
2. the steps for developing products and processes that solve problems
3. false / testing shows whether a product does what it is supposed to do
4. true / engineers and scientists will get information from testing their product that tells them how it could be improved and what people might not like about it.
5. possible answer: if a step does not result in the expected outcome, that step needs to be repeated to find out if the outcome will be the same, or if the step needs rethinking.
Chapter Review 1. Possible answer: I use a computer every day. I can send emails to my friends quickly.
2. B
3. Possible answer: An x-ray machine helps doctors see the bones inside of people.
4. Possible answer: A prosthetic hand
5. Possible answer: Robotic arms can have different end effectors
6. Possible answer: The robot could have a tail and fins like a fish.
7. 280 toys
8. Possible answer: The engineer should research cars and then come up with several solutions. The prototype should be tested to see if it uses less gas. The car may need to be redesigned.
9. A
10. Possible answer: Vaccines are one technology that has changed our lives. People used to suffer and sometimes die from many diseases. Today, many people do not get these diseases because they are vaccinated.
Benchmark Practice
1. B
2. C
3. A
4. D
5. Possible answer: It should be able to move like a healthy eye. It should see in color. It should work in different types of light. It should focus automatically.