What is the force that opposes motion and can be found anytime two surfaces are in contact?

friction

momentum

net force

spring forces

A NASA explorer spacecraft with a mass of 1,000 kg takes off in a positive direction from a stationary asteroid.

18. In a solid conductor such as a metal, what is the cause of an electric current? A. A flow of positive and negative charges. B. A flow of positive charges only. C. + A flow of negative charges only. D. A flow of protons. E. A flow of neutrons.

What is the most important thing in life?

What is the velocity of a snail that travels 0.20 meters in 1 minute

What rock type does the principle of superposition apply to and how is the principle of superposition used to study the history of life on Earth?

How does the overtone number relate to the standing wave pattern number

Which of the following statements about Em waves is true? A. Em waves all have the same speed B. Em waves all have the same wavelength C. Em waves only travel through water D. Em waves all have the same amount of energy

A teacher has asked four students to state a scientific theory. Which student is correct?

What are the two main currents that affect the US on the east and west coast?

What role do volcanoes play in the flow of energy and cycling of matter on earth?