Mar 22 2018ACT Science Practice Tests 2 ACT Science Practice Tests 2 0% Complete Mark for Review View Answer 1) Scientist 1Gravity really does exist. It acts according to the laws which we have explained and abundantly serves to account for all the motions of celestial bodies. Gravity is a predictable force that acts on all matter in the universe and is a function of both mass and distance. Each particle of matter attracts every other particle (for instance, the particles of “Earth” and the particles of “you”) with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. So, the farther apart the particles are, and/or the less massive the particles, the less the gravitational force. When you deal with massive bodies like the Earth, however, which has a mass of 6E+24 kilograms, it adds up to a rather powerful gravitational force. That’s why you’re not floating around in space right now. The force of gravity acting on an object is also that object’s weight. When you step on a scale, the scale reads how much gravity is acting on your body. Scientist 2 Gravity is much weirder: a natural consequence of a mass’s influence on space. Gravity is not a force but it is a distortion of space (or more precisely, spacetime) caused by the presence of matter or energy. A massive object generates a gravitational field by warping the geometry of the surrounding spacetime. The curvature of spacetime affects light rays. So, light is also affected by gravity. Gravity affects the paths of photons, even though they have no mass. Massive objects in space will cause warping or distortion of space-time which we all “feel” as gravity. The effects of gravity can be described by the curvature of space and time, usually just called ‘space-time’ curvature. So, matter follows the curvature of space, but we know matter is the source of gravity, so the curvature responds to matter as well. Space is nothing more than the relative position of two systems, that there is no objective space (nor time) that applies to every observer, and both motion and simultaneity in time depend on the choice of reference frames.Which of the following statement can explain the fact that earth is not moving to any other bigger star than our sun from the perspective of scientist 1? The mass of our sun is greater than the mass of any other existing star. The distance between our sun and earth is less, therefore, the lesser the distance the greater is the gravitational force. The distance between our sun and earth is greater as compared to other bigger stars, therefore, the greater the distance, the greater is the gravitational force. Sun is massive than earth, therefore, it warps the earth with the gravitational force. Both B and DDon’t have time to finish? Enter your email address and we’ll send you a link to continue your exam. Save Exam Save Exam Grade Exam