# Central Forces

Jun 17th, 2015
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Newton’s first law of motion states that a body will continue to move at a constant velocity in a straight line unless it is acted on by a force. If a force is applied to cause a net force on the object, the object will undergo an acceleration. The direction of the acceleration is in the direction of the net force and inversely dependent on the mass of the object.

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Chapter 1IntroductionMULTIPLE CHOICE1. Since 1983 the standard meter has been defined in terms of which of the following?a. specific alloy bar housed at Sevres, Franceb. wavelength of light emitted by krypton-86c. distance from the Earth's equator to the North Poled. the distance light travels in a certain fraction of a second2. Since 1967 the standard definition for the second has been based on which of the following?a. characteristic frequency of the cesium-133 atomb. average solar dayc. sidereal dayd. Greenwich Civil Time3. In mechanics, physicists use three basic quantities to derive additional quantities. Mass is one of the three quantities. What are the other two?a. length and forceb. power and forcec. length and timed. force and time4. The prefixes which are abbreviated p, n, and G represent which of the following?a. 10-2, 10-6, and 1015b. 109, 106, and 1010c. 1012, 109, and 109d. 1015, 106, and 10125. The ratio M/m of the prefixes M and m has what value?a. 103b. 106c. 109d. 10186. One year is about ____ seconds while one day is exactly ____ seconds.a. , 86 400b. , 86 400c. , 8 640d. , 36 0007. The nuclei of atoms containa. electrons only.b. neutrons only.c. protons and electrons.d. protons and neutrons.8. When was the existence of the neutron confirmed?a. in ancient timesb. in 1895c. in 1932d. in 19699. The proton contains which of the following combination of quarks?a. two up quarks and

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