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What is the law of inertia, which Galileo helped to establish?

An object at rest stays at rest unless acted upon by an external force.Equal and opposite forces exerted cause no motion.The speed of light is constant in all reference frames.All objects fall at the same rate regardless of mass.

Which of Galileo's experiments provided evidence that different weights fall at the same rate?

Dropping two balls of different weights from the Leaning Tower of Pisa.Rolling balls down inclined planes.Using a pendulum to measure time.Observing the motion of planets through a telescope.

What was one of Galileo's contributions to the understanding of projectile motion?

Projectiles follow a parabolic path.The horizontal and vertical motions are independent of each other.Gravity acts equally on all objects.Projectiles do not slow down until they hit the ground.

Assessment

What is the law of inertia, which Galileo helped to establish?

Which of Galileo's experiments provided evidence that different weights fall at the same rate?

What was one of Galileo's contributions to the understanding of projectile motion?