Question 3 1 pts Newton's 2nd law is applied to an object (or a system). Let's say you're applying Newton's 2nd law to a car. What force or forces should you consider when directly applying Newton's 2nd law to the car? 0 Only the forces that point in the direction of motion. All other forces can be neglected since they don't cause motion. 0 Only the forces whose 3rdIawforcepair partner are unequal in magnitude (because those cancel out) 0 All the forces that are exerted BY the car. 0 All the forces that are exerted ON the car Imagine a book at rest on a horizontal table. There are two forces on the book: a downward gravitational force (by the Earth) and the upward normal force (by the table). Question 4 1 pts How do the magnitudes of these two forces compare? (Careful! Words are important. This is about magnitudes.) The magnitudes are exactly equal 0 The magnitudes are exactly opposite (different sign) Question 5 1 pts How do the y-components of these two forces compare? O The ycomponents are exactiy equal 0 The ycomponents are exactiy opposite (negative sign) The questions below are about section 3.7. Question 6 1 pts Consider a ball that has a mass of 2 kg. If you are holding it in your hand, what is the magnitude of the GRAVITATIONAL FORCE on it (i.e., the "weight")? O4.9N OON 029.4N O9.8N 0 None of these is correct. 0 19.6 N Question 7 1 pts Now you drop the same ball as above. While it is accelerating downward, what is the magnitude of the gravitational force exerted on it? Q Same as before (equal to 0) 0 Greater than before O Less than before O Same as before (greater than 0). Question 8 1 pts You have a 2 kg ball and a 200 kg ball. You drop them at the same time. Neglect air drag. You observe that the two balls have identical accelerations because they're both in free fall. While falling, how do the gravitational forces on the balls compare? O The force on the heavier ball is greater. O The force on the lighter ball is greater. O Both forces are equal (greater than D) O Both forces are equal (equal to 0)