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31 Cards in this Set

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 The force that causes downward acceleration is GRAVITY The force of gravity depends on the __ of an object. MASS The force pulling objects toward the center of Earth is called.. GRAVITY What will change on another planet, mass or weight? WEIGHT (due to change in gravity) How can you change an object's mass? ADD or REMOVE PIECES The force created by the effect of gravity on objects is called WEIGHT The value for the acceleration due to gravity is 9.8 m/s^2 The equation for weight is w = mg What is the unit for weight? N or kg.m/s^2 Gravity is a force of attraction between any two objects that have mass. This is Newton's law of.. UNIVERSAL GRAVITATIONAL ATTRACTION What is the gravitational constant? G (a value that is the same everywhere in the Universe) What variables are included in the calculation of Universal Gravitation? MASS (of each object) and the RADIUS between the objects A force that resists forward motion is FRICTION A force that works in the opposite direction to motion is FRICTION What are the four types of friction? AIR, SLIDING, ROLLING, VISCOUS Friction cause by air moving around objects is called AIR FRICTION (or AIR RESISTANCE) Friction due to motion through water or other fluids is called VISCOUS FRICTION Friction caused by two surfaces rubbing together is SLIDING FRICTION Friction caused by one object rolling over another is called ROLLING FRICTION A fish swimming in a lake is an example of __ friction. VISCOUS Rollerblades moving across the sidewalk is an example of __ friction. ROLLING Tires skidding on the road is an example of __ friction. SLIDING A plane flying is an example of __ friction. AIR What reduces air friction? AERODYNAMIC SHAPES What reduces viscous friction? SHAPE, THINNER/LESS VISCOUS FLUIDS What changes sliding friction to viscous friction? OIL What reduces sliding friction? SMOOTHER SURFACES How does friction affect acceleration? CAUSES DECELERATION Which of Newton's laws states: "The force of attraction between objects is related to their masses and inversely related to the distance between them." LAW OF UNIVERSAL GRAVITATION In the equation v=d/t, v is __ related to d. DIRECTLY In the equation v=d/t, v is __ related to t. INVERSELY