Here are links to the most recent Q&As:
- Why does a plastic food container shrink after microwaving?
- Why do things float better in salt water than in fresh water?
- Why do greenhouse gases warm the earth?
- Why is easier to keep a bicycle upright when it is moving faster?
- How can an object spin at constant angular velocity when its parts are accelerating?
- When you push on a rotating object, when are you doing work?
- Rotating "up" or "down" -- is that like clockwise and counter-clockwise?
- When you push someone on a swing, why don't the forces cancel?
- Is deceleration something different from acceleration?
- How can a basketball weigh 7.5 to 8.5 pounds when blown up but much less when deflated?
- Why does a diving bounce up and down after the diver jumps off its surface?
- Does a rocket push up on itself?
- Why does a ball fall only about 5 meters in its first second of falling?
- Why does a sheet of paper fall faster when it's above a falling book?
- Why doesn't a moving wagon fall through a sidewalk?
- Which ball lands first: one thrown up or one thrown forward?
- How do the new Cyclonic Wave Microwave Ovens work?
- How can you calculate the position of a falling ball?
- If an object is moving, how could nothing be pushing on it?
- Why do objects bounce when they fall on the floor?