# Chap 14 ECO Review Force: Question Preview (ID: 634)

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 A force is .... a) a change in speed and/or direction b) a push/pull or anything that causes a change in motion c) anything that is balanced in motion d) a property of matter that causes things to resist a change in motion What is friction? a) A force that slows motion b) A property of matter that slows motion c) A force applied along a rope d) When two objects interact with each other Which of the following is NOT a type of friction a) sliding b) rolling c) inertia d) static Friction is caused when ...... a) two surface areas come into contact b) two surface areas DO NOT come into contact c) gravity force is felt by an object d) there is a lubricant on the surface of an object Which will reduce friction force? a) Create more pressure between two surfaces b) Create more "hills and valleys" or point of contact between two surfaces c) Make sure that there are plenty of places for two surfaces to make contact d) Rubbing a lubricant between two surfaces Viscous friction is friction in the ____________, and with air friction ___________ is NOT possible. a) air, free fall b) water, free fall c) rope, acceleration d) water, acceleration The force that allows objects to orbit around a massive object is called a) normal b) friction c) gravity d) compression This measurement will change as you move from one gravitational strength to another a) force b) speed c) mass d) weight The strength of gravity on earth is ..... a) 9.8 N/kg b) 9.8 km/hour c) 9.88888 N/hour d) 98 N/kg The ___________ of an object will never change. a) weight b) mass c) gravity d) shape
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