Gravity is necessary to make a projectile land back on the ground. Long JumperSoccer PlayerProjectiles in Motion Projectile MotionExamples: Projectiles in Motion (left)Projectile motion refers to the motion of an object projected into the air at an angle. Which car (red, green, or blue) experiences the greatest acceleration? The blue car (car on the bottom)ДҐAngles (): the spacewithin two lines (right)ДefinitionsTension: the state of being stretched or strained. The blue and green cars are speeding up.Дў. Only the green and blue car accelerate, the red car moves at a constant speed, thus is not accelerating. Matter = all material substances that occupy space (anything that has mass and occupies volume)Weight = is the force on an object due to the gravitational pull of a planet or other heavenly bodya = change in velocity/ time)a = gravity = 9.81 m/s2 (constant acceleration)Д¤Velocity (v): how far you go over a set amount of time (v = distance/time)Д¬AR 1CAR 2CAR 3Which car or cars (red, green, and/or blue) are undergoing an acceleration? Study each car individually in order to determine the answer. For these reasons, all of the eight statements are false there is an erroneous part to each statement due to the confusion of weight, mass, and force of gravity.

Since weight is a measure of gravity's pull upon an object, it would also be appropriate to say that the elephant weighs more than the feather. That is, the Earth is pulling downwards upon the elephant with more force than it pulls downward upon the feather. Due to its greater mass, the elephant also experiences a greater force of gravity. Clearly, the elephant has more mass than the feather. Mass refers to the amount of matter in an object. The force of gravity experienced by an object is dependent upon the mass of that object. This force of gravity is what causes both the elephant and the feather to accelerate downwards. That is to say, the only force acting upon the two objects is the force of gravity. In the absence of air resistance, both the elephant and the feather are in a state of free-fall. Test your understanding by making an effort to identify the following statements as being either true or false.TRUE or FALSE:The elephant and the feather each have the same force of gravity.The elephant has more mass, yet both elephant and feather experience the same force of gravity.The elephant experiences a greater force of gravity, yet both the elephant and the feather have the same mass.On earth, all objects (whether an elephant or a feather) have the same force of gravity.The elephant weighs more than the feather, yet they each have the same mass.The elephant clearly has more mass than the feather, yet they each weigh the same.The elephant clearly has more mass than the feather, yet the amount of gravity (force) is the same for each.The elephant has the greatest acceleration, yet the amount of gravity is the same for each.If you answered TRUE to any of the above, then perhaps you have some level of confusion concerning either the concepts or the words force, weight, gravity, mass, and acceleration. Why is this so? This question is the source of much confusion (as well as a variety of misconceptions). Further, the acceleration of each object is represented by a vector arrow.Many people are surprised by the fact that in the absence of air resistance, the elephant and the feather strike the ground at the same time. The motion of the elephant and the feather in the absence of air resistance is shown. Which object - the elephant or the feather - will hit the ground first? The animation at the right accurately depicts this situation. Suppose also that air resistance could somehow be eliminated such that neither the elephant nor the feather would experience any air drag during the course of their fall. Suppose that an elephant and a feather are dropped off a very tall building from the same height at the same time. Which has the greater mass the elephant or the feather? Gravity (g): the FORCE of attraction by which bodies tend to fall toward thecenterДefinitionsElephant vs. Catapult Physics&Lab ActivityForce (F): strength or power applied upon an object.ДefinitionsMass (m): the quantity of matter (atoms/particles) in the object

Catapult physics