Exploring Forces and Motion

How does sound travel through air?

• Sound travels through air as light waves.

• Sound travels through air as pressure waves created by vibrating objects.

• Sound travels through air as solid particles.

• Sound travels through air as electrical signals.

What force pulls objects towards the Earth?

• Electromagnetism

• Gravity

• Friction

• Magnetism

What is gravity?

• Gravity is the curvature of time.

• Gravity is a type of energy.

• Gravity is the speed of light.

• Gravity is the force of attraction between two masses.

What is air resistance?

• A type of gas found in the atmosphere.

• Air resistance is a force that opposes the motion of an object through the air.

• A method to increase speed in the air.

• A measurement of air pressure.

How does air resistance affect falling objects?

• Air resistance increases the speed of falling objects.

• Air resistance has no effect on falling objects.

• Air resistance slows down falling objects and can lead to terminal velocity.

• Air resistance only affects objects that are not falling vertically.

How does water resistance impact swimming?

• Water resistance slows swimmers down and requires technique to overcome.

• Water resistance helps swimmers go faster.

• Water resistance has no effect on swimming performance.

• Swimmers can ignore water resistance completely.

What is friction?

• Friction is the force that enhances the motion of two surfaces in contact.

• Friction is the energy lost when two surfaces are heated together.

• Friction is the speed at which two surfaces move past each other.

• Friction is the force that opposes the relative motion of two surfaces in contact.

How does friction affect motion?

• Friction opposes motion and can slow down or stop moving objects.

• Friction only occurs in liquids and gases.

• Friction has no effect on motion.

• Friction increases the speed of moving objects.

What are simple machines?

• Simple machines are only used in construction.

• Simple machines are tools that only work on flat surfaces.

• Simple machines are devices that change the direction or magnitude of a force.

• Simple machines are complex devices that require electricity.

Can you name three types of simple machines?

• hammer

• wheelbarrow

• screwdriver

• lever, pulley, inclined plane