1) ... pulls a body to the centre of planet.  a) Weight b) Friction c) Upthrust 2) ... pushes the body up in liquid or gas. a) Weight b) Friction c) Upthrust 3) ... slows down a moving body. a) Weight b) Friction c) Upthrust 4) ... is large for rough objects and is small for smooth objects. a) Weight b) Friction c) Upthrust 5) ... is NOT measured in Newtons. a) Mass b) Friction c) Weight 6) ... changes with the strength of gravity. a) Mass b) Friction c) Weight 7) ... can be reduced with a lubricant. a) Mass b) Friction c) Weight 8) ... is equal to the weight of liquid displaced by a body. a) Mass b) Friction c) Upthrust 9) ... will stay the same on any planet in the Solar system. a) Mass b) Upthrust c) Weight 10) Density is ... divided by volume. a) Volume b) Weight c) Mass

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