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The relative densities of an object and the liquid it is placed in determine whether that object will sink or float. An object that has a higher density than the liquid it's in will sink. An object that has a lower density than the liquid it's in will float.
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having a smooth or lubricated surface may help decrease friction.
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Endothermic reactions absorb energy from the surrounding, but exothermic reactions release energy to the surrounding.
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the foot is an intricate part of the body, consisting of 26 bones, 33 joints, 107 ligaments and 19 muscles
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Endothermic reactions, on the other hand, absorb heat and/or light from their surroundings. For example, decomposition reactions are usually endothermic. In endothermic reactions, the products have more enthalpy than the reactants. Thus, an endothermic reaction is said to have a positive<span> enthalpy of reaction. This means that the energy required to break the bonds in the reactants is more than the energy released when new bonds form in the products; in other words, the reaction requires energy to proceed.</span>
