Unit 9 Quiz 1

A baseball player hits a ball. Which is the best description of the energy of the ball as it flies over the pitcher's head? chemical mechanical kinetic thermal

mechanical

An arrow is fired by a person on the ground 15 feet away from a target 20 feet high on a wall. Which statement correctly describes the change in the energy of the arrow as it moves toward the target? The potential energy and kinetic energy remain the same. The potential energy decreases as kinetic energy increases. The kinetic energy decreases as potential energy increases. The kinetic energy remains at zero, but potential energy increases.

The kinetic energy decreases as potential energy increases.

Which is the best example of potential energy? holding a basketball in the air rolling a ball across a flat table flowing electric current through a wire turning on a flashlight in a dark room

holding a basketball in the air

Which is the best term to use when describing the energy of motion? chemical kinetic potential thermal

kinetic

A welding torch produces a flame by burning acetylene fuel in the presence of oxygen. The energy released from the acetylene fuel is then used to melt a metal. Which energy transformation happens during this process? Chemical energy turns into thermal energy. Kinetic energy turns into potential energy. Thermal energy turns into electromagnetic energy. Potential energy turns into chemical energy.

Chemical energy turns into thermal energy.

Which statement is correct about the law of conservation of energy? Energy is created when water freezes. Energy is destroyed when sugar is burned. Energy stays inside molecules permanently. Energy is transferred when atoms are rearranged.

Energy is transferred when atoms are rearranged.

According to the law of conservation of energy, what will most likely happen in a closed system? Energy will be exchanged along with matter. Energy will be exchanged, but matter will not be exchanged. Energy will be created along with matter. Energy will be destroyed, but matter will not be destroyed.

Energy will be exchanged, but matter will not be exchanged.

In a chemical reaction occurring in an open beaker, the reactants have a mass of 10.0 g and contain 1000 J of energy. The products in the beaker contain a mass of 5.0 g and 500 J of energy. Which best explains the difference in energy and mass as reactants are converted to products? kinetic energy closed systems law of conservation electromagnetic energy

law of conservation

Which energy change best relates to a boulder that is rolling down the side of a hill? potential energy transforming into kinetic energy mechanical energy transforming into thermal energy potential energy transforming into electromagnetic energy mechanical energy transforming into electromagnetic energy

potential energy transforming into kinetic energy

Which statement describes thermal energy? the energy that is associated with electric fields the energy that is stored in chemical bonds the energy that is associated with the pull of gravity the energy that is associated with temperature

the energy that is associated with temperature