. Practical physics. akes flywheelssometimes burst, which makesthe equatorial diameter of theearth greater than the polar,which makes the heavier milkmove out farther than the ligfhtercream in the dairy separator (seeopposite p. 85), etc. Inertia manifesting itself in this tendencyof the parts of rotating systems to move away from the center ofrotation is called centrifugal force. 101. Momentum. The quantity of motion possessed by amoving body is defined as the product of the mass and thevelocity of the body. It is commonly called momentum. Thus,a 10-gram bullet moving 50,000 centimeters per s
. Practical physics. akes flywheelssometimes burst, which makesthe equatorial diameter of theearth greater than the polar,which makes the heavier milkmove out farther than the ligfhtercream in the dairy separator (seeopposite p. 85), etc. Inertia manifesting itself in this tendencyof the parts of rotating systems to move away from the center ofrotation is called centrifugal force. 101. Momentum. The quantity of motion possessed by amoving body is defined as the product of the mass and thevelocity of the body. It is commonly called momentum. Thus,a 10-gram bullet moving 50,000 centimeters per second has500,000 units of momentum ; a 1000-kg. pile driver moving1000 centimeters per second has 1,000,000,000 units of mo-mentum ; etc. We shall always express momentum in , that is, as a product of grams by centimeters per second. 102. Second law. Since a 2-gram mass is pulled towardthe earth with twice as much force as is a 1-gram mass, andsince both, when allowed to fall, acquire the same A^elocity in. Fig. 85. Illustrating centrifugalforce
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