Forces and Energy

Forces and Energy part 1A (14:06)

What is potential energy?

The potential to do work

Give some examples of different types of:

potential energy

electrical potential energy

Lightning

chemical potential energy

Eating food

gravitational potential energy

When water is pumped into a water tower

How does a change in mass of an object affect the gravitational potential energy of that object? How does a change in height affect it?

Mass decrease, PI decrease

Mass increade, PI increase

Height increase, PI increase

Height decrease, PI decrease

What is kinetic energy? List examples of objects with kinetic energy.

Any object with mass that is in motion

Explain what happens to kinetic energy when the mass and speed of an object changes.

The kinetic energy changes likewise with the weight and speed

Define thermal energy.

Another form of kinetic energy A measure of kinetic molecules within the material

Explain the law of conservation of energy.

Energy cannot be created or destroyed only change form

What is gravitational force?

The force between two forces that have mass

The more massive the object, the more gravitational force

Gravitational force decreases with distance

Forces and Energy part 1B (18:55)

What is projectile motion? Give an example of an object that exhibits projectile motion, and describe the forces that are acting on it.

Cannon ball example. Gravity acts against projectile motion by pulling the cannon ball down.

How does an object become a satellite?

A body in free fall in a sideways motion

Explain the role of gravity in the formation of solar systems and galaxies. How does gravity create spinning disks of material that form solar systems and galaxies?

Molecules bonded together by spinning forces

Gravity is important and plays a role in the orbit of planets, tidal locking,

Describe the movement of objects in our solar system.

Orbit in a circular motion most planets and larger moons orbit in the same...