Does your skate park playground ramp design support the law of conservation of energy? use evidence to explain why or why not. be sure to include both parts of the law of conservation of energy in your answer.

Phase changes are chemical changes. true or false

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Boxing gloves are padded to lessen the force of a blow. (a) calculate the force exerted by a boxing glove on an opponent’s face, if the glove and face compress 7.50 cm during a blow in which the 7.00-kg arm and glove are brought to rest from an initial speed of 10.0 m/s. (b) calculate the force exerted by an identical blow in the gory old days when no gloves were used and the knuckles and face would compress only 2.00 cm. (c) discuss the magnitude of the force with glove on. does it seem high enough to cause damage even though it is lower than the force with no glove?