ASTRO 7N test 1 with 100% correct answers 2024

ASTRO 7N test 1Newton's first law - correct answer An object at rest, or in motion in a straight line at a constant speed, will remain in that state unless acted upon by a force. (example: If the Sun suddenly disappeared, the Earth would continue in the direction that it was traveling in its orbit at that time.) Newton's second law - correct answer The acceleration of a body due to a force will be in the same direction as the force, with a magnitude inversely proportional to its mass. •Force = mass x acceleration (or, F = m a ) •alternatively: a = F / m •(A smaller mass will move faster, if the same force is applied to it.) Newton's third law - correct answer For every action, there is an equal and opposite reaction. •(The Sun exerts force on planets, and they orbit it — the planets exert equal force on Sun, but it only moves slightly because of its very large mass relative to the planets.) The strength of gravity, g, on the surface of a planet is given by - correct answer g= m/r^2 (M is the mass of the planet and R is its radius.) If the mass of a planet were twice that of another, but they had the same radius, the gravity felt on the surface of the more-massive one would be - correct answer twice as strong If the radius of a planet were twice that of another, the gravity is - correct answer 1/4 as strong Mars has _____ the mass of the Earth and _____the radius of Earth. - correct answer 1/10, 1/2 Mars has a surface gravity ____ that of Earth. - correct answer 4/10 Newton's Universal Law of Gravitation - correct answer he force of gravity is proportional to (mass of object 1) × (mass of object 2) divided by the distance between the two objects squared: F=M1 x M2/d 2