Question

choose the best answers.
1.4)__the weight of an object is determined by_.
a. density
b. elasticity
c. gravity
1.5)__the base unit for mass in the metric system is the_.
a. gram
b. meter
c. liter
1.6)__a_can be used to measure the mass of different types of matter.
a. thermometer
b. graduated cylinder
c. spring scale
1.7)__a great or heavy mass_an object is big.
a. means
b. does not mean
1.8)__mass_the same as weight.
a. is
b. is not

Explanation:

• 1.4：Weight is the force exerted on an object due to gravity. The formula for weight is \(W = mg\) (where \(W\) is weight, \(m\) is mass, and \(g\) is the acceleration due to gravity). Density (\(

ho=\frac{m}{V}\), mass per unit volume) and elasticity (ability of a material to return to its original shape after deformation) are not directly related to weight determination.

• 1.5：In the metric system, the base unit for mass is the gram. The meter is the base unit for length, and the liter is a unit for volume (though it is a derived unit, not a base unit in the strict SI sense, but commonly used for liquid volume).
• 1.6：A spring scale measures force (which can be related to mass via \(F = mg\) if \(g\) is known). A thermometer measures temperature, and a graduated cylinder measures volume (usually of liquids).
• 1.7：Mass is a measure of the amount of matter in an object. An object can have a large mass (e.g., a small - dense metal cube) and not be big in terms of volume. So a great or heavy mass does not mean an object is big.
• 1.8：Mass is a measure of the amount of matter (\(m\)), while weight (\(W=mg\)) is a force. They are related but not the same. For example, an object has the same mass on Earth and the Moon, but its weight is different because \(g\) (acceleration due to gravity) is different on the Moon (\(g_{Moon}\approx\frac{1}{6}g_{Earth}\)).

Answer:

1.4) C. gravity
1.5) A. gram
1.6) C. spring scale
1.7) B. does not mean
1.8) B. is not