Physics Revision Work Energy Power SEC 3/4/5

1. When a ball is thrown up vertically, its ____________energy decreases, while its gravitational potential energy increases

When a ball is thrown up vertically, its kinetic energy decreases because it is moving against the force of gravity and slowing down. At the same time, its gravitational potential energy increases because it is moving higher against the force of gravity.

Explanation

When a ball is thrown up vertically, its kinetic energy decreases because it is moving against the force of gravity and slowing down. At the same time, its gravitational potential energy increases because it is moving higher against the force of gravity.

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2. Princple of conservation of energy states that energy cannot be created nor destroyed. Energy is transform from one __________ into another.

The principle of conservation of energy states that energy cannot be created nor destroyed. Instead, it can only be transformed from one form, type, or kind into another. This means that energy can change its manifestation or characteristics, but the total amount of energy in a closed system remains constant.

Explanation

The principle of conservation of energy states that energy cannot be created nor destroyed. Instead, it can only be transformed from one form, type, or kind into another. This means that energy can change its manifestation or characteristics, but the total amount of energy in a closed system remains constant.

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3. A electric dry cell (battery) is used to power a lamp. what energy conversion takes place?

Chemical --> electrical energy

Chemical --> light energy only

Chemical --> electrical energy --: heat and light energy

Chemical --> electrical energy --: heat energy only

The correct answer is "chemical --> electrical energy --: heat and light energy". When an electric dry cell (battery) is used to power a lamp, the chemical energy stored in the battery is converted into electrical energy. This electrical energy is then converted into both heat and light energy, which are the forms of energy that the lamp emits.

Explanation

The correct answer is "chemical --> electrical energy --: heat and light energy". When an electric dry cell (battery) is used to power a lamp, the chemical energy stored in the battery is converted into electrical energy. This electrical energy is then converted into both heat and light energy, which are the forms of energy that the lamp emits.