Question: Q: What type of force exists between two touching surfaces? Choices: - opposing - centrifugal - tension - friction A:
Answer: friction

Question: Q: Boiling points increase with which kind of mass? Choices: - lipid mass - universal mass - protons mass - molar mass A:
Answer: molar mass

Question: Q: Where does electric power originate? Choices: - the Sun - magnets - coal mines - power plants A:
Answer:
power plants