Newton's Third Law
What is Newton's Third Law of Motion?
Newton's Third Law states that for every action, there is an equal and opposite reaction.
What is the difference between balanced and unbalanced forces?
Balanced forces are equal in size and opposite in direction, causing no change in motion; unbalanced forces cause a change in the motion of an object.
What is an electric current?
Electric current is the flow of electric charge through a conductor.
What is gravity?
Gravity is a force that pulls objects toward each other.
Name one key concept covered in this unit.
Answers may vary.
Give an example of an action-reaction force pair in everyday life.
When you push against a wall, the wall pushes back with an equal and opposite force. (answers will vary)
What is the difference between balanced and unbalanced forces?
Balanced forces are equal in size and opposite in direction, causing no change in motion; unbalanced forces cause a change in the motion of an object.
How do magnets interact with each other?
Like poles of magnets repel; opposite poles attract.
How does gravity affect objects in space? 300: Why do objects fall to the ground?
Gravity keeps planets in orbit around stars and moons around planets.
How can you demonstrate Newton's laws through a simple experiment?
Dropping different objects to see how they fall shows gravity and motion principles.
How does a rocket launch demonstrate Newton's Third Law?
A rocket launches because the engines push exhaust gases downward, and the gases push the rocket upward with an equal and opposite force.
Describe an experiment to test the effects of balanced forces.
Answers may vary
Describe how a simple circuit works.
A simple circuit works when a power source pushes electrons through wires to a device, and the circuit is complete allowing current to flow.
Why do objects fall to the ground?
Objects fall to the ground because Earth’s gravity pulls them downward.
What are some common misconceptions about forces?
A common misconception is that heavier objects fall faster than lighter ones in the absence of air resistance.
Explain how walking involves action-reaction forces.
When walking, your foot pushes backward on the ground, and the ground pushes your foot forward with an equal and opposite force.
What happens to an object at rest when unbalanced forces act on it?
An object at rest will start moving in the direction of the unbalanced force acting on it.
What are the components of an electric circuit?
Components include a power source (battery), conductive path (wires), and a load (like a bulb or resistor).
Explain how gravity differs on Earth and the Moon.
Gravity on the Moon is weaker than on Earth, so objects weigh less and fall more slowly.
Why is it important to understand forces and motion in science?
Understanding forces and motion helps explain how things move and interact in the physical world.
Describe how Newton's Third Law applies to a swimming fish. Force & Motion
A fish pushes water backward with its fins, and the water pushes the fish forward with an equal and opposite force.
What happens to an object at rest when unbalanced forces act on it?
Greater mass means more force is needed to accelerate an object; for example, pushing a heavy box requires more effort than a light one.
Explain the relationship between electricity and magnetism.
Electricity and magnetism are related; moving electric charges produce magnetic fields, and changing magnetic fields can induce electric currents.
Describe how gravitational forces influence the motion of planets in the solar system.
Gravitational forces cause planets to orbit the Sun in elliptical paths.
Summarize what you have learned about motion and stability in this unit.
This unit taught that motion results from forces acting on objects and that forces always come in pairs with equal and opposite reactions. (answers may vary)