3/11 science quiz Flashcards
What is energy?
Energy is the ability to cause motion or change. Energy is a concept that scientists use to explain phenomena, such as why a rolling bowling ball knocks over pins.
What are the 2 forms of energy?
Kinetic energy
and
Potential energy
What does the conservation of energy mean?
The total energy in an isolated system always remains the same.
What is the law of conservation of mass?
Mass cannot be created or destroyed in a chemical reaction or physical transformation. The total mass of the reactants equals the total mass of the products.
What is the law of conservation of matter?
The total amount of matter stays the same, even when matter changes form.
What is the law of conservation of energy?
Energy cannot be created or destroyed in an isolated system; it can only be transformed from one form to another. The total energy of the system remains constant.
What is the relationship between KE and mass?
Kinetic energy and mass have a proportional relationship and a linear relationship. So, kinetic energy increases as the mass increases. These two variables will increase at the same rate because of their linear relationship.
What is the relationship between KE and speed?
Kinetic energy has a nonlinear relationship with speed and a proportional relationship with speed squared. So, kinetic energy increases as speed increases. However, it does not increase at the same rate as speed does.
What is gravitational PE?
Gravitational potential energy is when potential energy is stored in a system of objects interacting by gravitational forces.
What is electric PE?
Electric potential energy is when potential energy is stored in a system of objects interacting by electric forces.
What is magnetic PE?
Magnetic potential energy is when potential energy is stored in a system of objects interacting by magnetic forces.
What other types of PE are there?
Elastic potential energy: the energy stored in something when you push, pull, or force it out of shape: think of rubber bands or springs.
Chemical potential energy: the energy something stores because of its chemical makeup: batteries have this kind of energy.
What is acceleration?
An object accelerates when it changes speed, changes direction, or both.
What is speed and velocity?
Speed and velocity describe how fast an object changes position. Velocity also describes the direction an object is moving.
What are forces?
Forces are pushes or pulls that act on objects and cause changes, such as changes in motion. Forces are often measured in newtons ( N ), while energy is measured in joules ( J ).
What is friction?
It is the resistance of motion when one object rubs against another.
What is the formula for KE?
(1/2)m*v^2
What are the two formulas for PE?
massheightgravitational acceleration ((9.8)m/s^2)
OR
weight*height
