The Invisible Force of Friction — Questions and answers

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What is the invisible force that slows down the skateboard in Neo-San Francisco?

Choices

  1. Friction ✓
  2. Gravity
  3. Wind
  4. Electricity

Answer: Friction

From page 1

What did Juniper compare friction to when Vera explained it?

Choices

  1. An invisible brake ✓
  2. A powerful engine
  3. A slippery slope
  4. A bouncy spring

Answer: An invisible brake

From page 2

According to Vera, what do even smooth surfaces have that creates friction?

Choices

  1. Tiny bumps and grooves ✓
  2. Invisible glue
  3. Strong magnets
  4. Slippery oil

Answer: Tiny bumps and grooves

From page 3

What extreme effect does friction have when spacecraft re-enter Earth's atmosphere?

Choices

  1. It generates intense heat ✓
  2. It makes them speed up uncontrollably
  3. It makes them invisible
  4. It causes them to float away

Answer: It generates intense heat

From page 9

According to Vera, what does understanding friction help us do?

Choices

  1. Build better things and explore new frontiers ✓
  2. Make objects heavier and slower
  3. Cause more natural disasters
  4. Make things disappear into thin air

Answer: Build better things and explore new frontiers

From page 10