Author Question: How many forces act on an upwardly tossed coin when it gets to the top of its path? A) one; the ... (Read 18 times)

xclash · **on:** Jul 29, 2018

How many forces act on an upwardly tossed coin when it gets to the top of its path?

A) one; the force due to gravity
B) two; gravity and the force in the coin itself
C) three; gravity, the coin's internal force, and a turnaround force
D) none of the above

Question 2

What, if any, evidence did Galileo have for the law of inertia?

A) A smooth ball slows down when rolling uphill, and speeds up when rolling downhill, so it should maintain an unchanging speed on a level surface.
B) Using a telescope, he observed meteors and comets moving at unchanging velocity through outer space.
C) Noting that the length of the year does not change, he concluded that Earth must maintain an unchanging speed when moving around the sun.
D) All of the above.
E) He didn't have direct evidence, but proposed the law of inertia only because of the known failures of Aristotelian physics.