Answer Key Forces and Energy Review Forces A

Answer Key Forces and Energy Review

Forces • A force is a _______push_______ or _______pull________

• What are three main forces we learned about?

• What are three main forces we learned about? – Gravity – Friction – Magnetism

• Is gravity a pulling or pushing force?

• Is gravity a pulling or pushing force? – Pulling force

• With magnets ____________ poles attract and__________ poles repel.

• With magnets ___opposite______ poles attract and____like_______ poles repel.

• Give an example of when we use friction to help us.

• Give an example of when we use friction to help us. • Brakes on a bicycle or in a car use friction to help us stop.

Forms of Energy • All forms of energy can be classified as ___________ or ___________

Forms of Energy • All forms of energy can be classified as ____kinetic_____ or _______potential______

• What is kinetic energy?

• What is kinetic energy? – Energy in motion

• When does a bouncing ball have kinetic energy?

• When does a bouncing ball have kinetic energy? – When it is moving

• What is potential energy?

• What is potential energy? – Stored energy

• When does a bouncing ball have potential energy?

• When does a bouncing ball have potential energy? – At the top of its bounce

• What do the letters in MRSCENT stand for? M= R= S= C= E= N= T=

• What do the letters in MRSCENT stand for? M=Mechanical R= Radiant S= Sound C= Chemical E= Electrical N= Nuclear T= Thermal

Light Energy As light travels through a lens it does what?

As light travels through a lens it does what? • Refracts (bends)

As light hits the surface of a mirror it does what?

As light hits the surface of a mirror it does what? • Reflects (bounces off)

Draw a picture of a convex lens.

Draw a picture of a convex lens.

Draw a picture of a concave lens.

Draw a picture of a concave lens.

What state of matter does light travel through the fastest?

What state of matter does light travel through the fastest? • GAS!

Sound Energy • Sound is formed by what?

Sound is formed by what? • Vibrations

What state of matter does sound travel through the fastest?

What state of matter does sound travel through the fastest? • Solids (because the particles in the matter are closer together).

Materials that are good carriers of sound are known as what?

Materials that are good carriers of sound are known as what? • Conductors

Electrical Energy • What is the difference between a series circuit, and parallel circuit?

Electrical Energy • What is the difference between a series circuit, and parallel circuit? – In a series the electrons only have one path to travel around on. In a parallel circuit the electrons have multiple paths to travel around on.

• What is the difference between a conductor and insulator?

• What is the difference between a conductor and insulator? – A conductor allows electricity (or energy) to travel through it, whereas conductors do not.

• Can electricity travel in an open circuit?

• Can electricity travel in an open circuit? – No, electricity can only travel through a closed circuit.

• What part of an atom is responsible for electricity and what is its charge?

• What part of an atom is responsible for electricity and what is its charge? – Electrons, they have a negative charge.

• What forms around moving currents of electricity? – magnetism

A Little of Everything • How many colors in the spectrum are carried by white light?

• How many colors in the spectrum are carried by white light? – 7 ROY G BIV

• Lightning is a form of what type of electricity?

• Lightning is a form of what type of electricity? – Static Electricity

• In order to produce sound an object must do what?

• In order to produce sound an object must do what? – vibrate

• A material that resists electric current is a what?

• A material that resists electric current is a what? – resistor

• What type of magnet can be turned on and off?

• What type of magnet can be turned on and off? – electromagnet