caption: Investigating the force of gravity on Earth
exif: {"Image DocumentName": "Investigating the force of gravity on Earth", "Image ImageDescription": "Using classroom resources, investigate how you could measure the gravitational field strength on Earth. What are you measuring? How are you measuring it? What does it mean? Students should establish that they are in fact measuring acceleration due to gravity and accepting that this is the same as gravitational field strength. Suggested methods include simple pendulum method, compound pendulum method, oscillating test-tube of lead shot, free fall, ticker tape used vertically, pulsed water droplets and strobe.  Guidance can be found on:   \u00a9 NASA.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}