wunder beta🏎️ Forces & Motion
Master Newton's three laws that govern how everything moves.
What you’ll learn
- Define force and inertia and explain Newton's first law.A force is a push or pull that changes motion. Newton's first law states objects resist changes to their motion, and mass, distinct from weight, measures that inertia.
- Apply Newton's second law relating force, mass, and acceleration, including gravity.F equals ma links force, mass, and acceleration: more force means more acceleration, more mass means less. Gravity accelerates all objects near Earth equally at about 9.8 m/s squared.
- Explain Newton's third law and its role in propulsion, walking, and modern science.Forces come in equal and opposite pairs. This third law explains rockets, walking, and propulsion, and together the three laws founded classical mechanics.
Questions this course answers
What does Newton's first law describe?
The first law, the law of inertia, says objects keep their state of motion unless a net force changes it.
Why do passengers lurch forward when a car stops suddenly?
Inertia means the passengers' bodies tend to keep moving forward even as the car stops, which seatbelts counteract.
How do mass and weight differ?
Mass measures the amount of matter and is constant, while weight is the gravitational force on that mass and depends on location.
Which equation expresses Newton's second law?
Newton's second law states that net force equals mass times acceleration, F = ma.
If you double the force on the same object, its acceleration will:
Acceleration is directly proportional to net force, so doubling the force doubles the acceleration for the same mass.
Ignoring air resistance, what is the acceleration of falling objects near Earth?
Near Earth's surface, gravity accelerates all objects equally at about 9.8 m/s squared, regardless of mass, when air resistance is ignored.
Grounded in trusted sources
- Philosophiae Naturalis Principia Mathematica by Isaac Newton (1687)
- NASA Glenn Research Center, "Newton's Laws of Motion" (grc.nasa.gov)
- Encyclopaedia Britannica, "Newton's laws of motion" (britannica.com)
- OpenStax College Physics (openstax.org)
Every Wunder lesson is built from real, reputable sources — never invented.
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