What is force, and how does it change motion?
Why does a cart keep moving after a push? Separate force, velocity and acceleration, compare different masses, and see why Newton’s third-law forces do not cancel the motion.
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#physics
Articles: 4
Why do astronauts float in weightlessness?
Earth’s gravity remains strong in orbit. Compare gravitational force with a scale reading and discover why a person, cabin and loose objects float together in free fall.
What are motion and speed?
A passenger stands still in a carriage yet moves past the platform. Compare reference frames and distinguish distance, displacement, average speed and average velocity.
What is physics, and why do we need it?
How can we test an explanation of nature? Use a pendulum to distinguish observations, models and predictions, and see why physics matters in everyday life and space.