Does an apple exert a gravitation force on the Earth? If so, how large a force? Consider an apple (a) attached to a tree and (b) falling. People sometimes ask, "What keeps a satellite up in its orbit around the Earth?" How would you respond? A bucket of water can be whirled in a vertical circle without the water spilling out, even at the top of the circle when the bucket is upside down. Explain. (watch the video https://bit.ly/2Cy1dJYLinks to an external site. Links to an external site.) Sometimes it is said that water is removed from cloths in the spin dryer by centrifugal force throwing the water outward. Is this correct? Explain. A car rounds a curve at a steady 50 miles/h. If it rounds the same curve at a steady 70 km/h, will its acceleration be any different? Explain