Forces of Nature

Unit Review Sheet

Facts and Definitions

Lesson 1: Physics and Force

• Objects at rest will remain at rest unless acted upon by a force.
• The science of the study of force is called physics.
• Vocabulary: force, gravity, inertia, and friction.

Lesson 2: Friction

• Friction is a force that hinders motion.
• Friction can be minimized or maximized depending on the surfaces rubbing against each other.

Lesson 3: Laws of Motion

• The three laws of motion describe how forces make things move.
• Inertia is the resistance of an object to changes in motion.

Lesson 4: Gravity

• Gravity pulls objects to the Earth at the same rate, regardless of how much they weigh.
• Centripetal force pulls objects inward when they are turning in a circle.
• Air friction can cause objects that are different shapes to fall at different rates.

Lesson 5: Projectiles

• An object that is thrown or shot by a force is called a projectile.
• Gravity is the force acting upon a projectile, causing it to follow a curved path.

Lesson 6: Energy

• Types of energy include potential, kinetic, thermal, light, chemical, sound, and electric.
• Potential energy is stored energy.

Lesson 7: Pressure and Force Change the Environment

• Pressure measures the amount that a pushing force is spread out over a large area or concentrated in a small one.
• An earthquake is caused by rocks that shift with great force.
• A glacier is a very large sheet of slowly moving ice.
• A volcano occurs as a result of molten rock being driven upward by pressure.
• The layers of the Earth are the crust, mantle, and core.

Final Project: Poster or Presentation

• [none]