51Work is said to be done on an object only when a force causes what?
52The unit of work is the same as the unit of what other physical quantity?
53Power is defined as the rate at which what is done?
54One watt is defined as one joule per what unit of time?
55The gravitational force between two bodies depends on their masses and what else?
56According to Newton’s law of gravitation, gravitational force is inversely proportional to the square of what?
57The universal gravitational constant is commonly represented by which symbol?
58The escape velocity needed to leave Earth’s gravitational pull is approximately how fast?
59An object thrown straight upward slows down on its way up mainly due to what force?
60The curved path followed by a projectile under gravity alone is called what?
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