Article: Most orchid issues are caused by overwatering. Your orchid might be getting too much water if it has soggy roots or rotting, limp, or discolored leaves. Just decrease how much, and how frequently, you water your orchid to get it to look its best.  If the roots are rotted, trim off the worst of the damage and repot the plant to provide it with additional nutrients. Be sure to dump out any water that collects in the saucer underneath the pot after you water. Alternatively, some orchids don’t get enough water and fail to thrive as a result. If the roots look dry and shriveled instead of lush and plump, your plant is dehydrated. Another sign of underwatering is shriveled or discolored leaves. Water your orchid more frequently to correct this problem. Use room-temperature water to water your orchid. Rainwater is ideal, but tap water that has sat out for 24 hours will also work, as this gives the chlorine time to evaporate. Orchids thrive in sunny environments. If yours has very dark green leaves, it might not be getting enough sunlight. Try moving it in front of a window or into a sunnier outdoor spot. If your orchid is outside, leaves or other foliage from surrounding plants or trees might be providing too much shade. Orchids that receive too much light may first show yellow leaves. As time goes on, the leaves will turn white, then brown. Additionally, if the leaves feel hot to the touch, it’s getting too much sun. If you notice these symptoms, move your orchid to an area with less direct sunlight. You can move the plant further away from a window or provide more shade by situating it near taller plants or trees. Keeping your orchid at the wrong temperature can cause all sorts of problems. If your orchid is in a spot with temperatures below 50 °F (10 °C), it’s likely not thriving. Try moving your orchid to a warmer location if your orchid is discolored or has pits, lesions, or sunken areas. Just as a too-cold environment can impact your orchid, so can one that’s too hot. Move your orchid to a cooler location or provide some shade for it if the temperature is above 80 °F (27 °C). Signs of heat stress include yellowing, withered, or leathery leaves or brown roots or leaf tips.
Question: What is a summary of what this article is about?
Water less often if you notice mushy roots. Increase how much you’re watering if the roots are dry and shriveled. Provide more light if the leaves are dark green. Reduce the amount of light your orchid gets if it’s sunburned. Raise the temperature if your orchid is discolored or has pitting or lesions. Move your orchid to a cooler spot if it has wilted, leathery, or yellowing leaves.

Newton’s second law of motion states that any object will accelerate when acted upon by a net or unbalanced force. In other words, if a force is acting upon an object that is greater than the forces acting in the opposite direction, the object will accelerate in the direction of the larger force.  This law can be summed up with the equation F = ma, where F is the force, m is the mass of the object, and a is acceleration. Using this law, we can calculate the force of gravity of any object on the surface of the earth, using the known acceleration due to gravity. On earth, the force of gravity causes objects to accelerate at a rate of 9.8 m/s2. On the earth’s surface, we can use the simplified equation Fgrav = mg to calculate the force of gravity. If you want a more exact approximation of force, you can still use the above equation, Fgrav = (GMearthm)/d2 to determine force of gravity. For this particular equation, you must use metric units. The mass of the object needs to be in kilograms (kg) and the acceleration needs to be in meters per second squared (m/s2). You must convert to these units before continuing with the calculation. For smaller objects, you can weigh them on a scale or balance to determine its weight in kilograms (kg). For larger objects, you will have to look-up the approximate mass in a table or online. In physics problems, the mass of the object will generally be provided to you. Once you have defined the variables of your equation, you can plug them in and solve. Be sure that all of your units are in metric and on the right scale. Mass should be in kilograms and distance in meters. Solve the equation using the proper order of operations.  Let’s use the same equation from above and see how close the approximation is. Determine the force of gravity on a 68 kg person on the surface of the earth. Make sure all your variables have the proper units: m = 68 kg, g = 9.8 m/s2. Write your equation. Fgrav = mg = 68*9.8 = 666 N. With F = mg the force of gravity is 666 N, while using the more exact equation yields a force of 665 N. As you can see, these values are almost identical.
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One-sentence summary --
Understand Newton’s Second Law of Motion, F = ma. Know the acceleration due to gravity on earth. Use the proper metric units. Determine the mass of the object in question. Solve the equation.