Problems

**1) If a spaceship is traveling in a straight line way out in space (far away from any planets), will it ever slow down? Why or why not? Which of Newton’s laws explains this?**


 * 2) If Newton’s first law says that objects in motion will stay in motion, then why do things slow down when we push them?**


 * 3) If a book sits on a table, the force of gravity pulls down. If there is a force on the book, why doesn’t it move?**


 * 4) If I can travel 100 m in 4 s, what is my velocity?**


 * 5) If I am driving at a velocity of 25 m/s, and I increase my velocity to 50 m/s in a period of 8 s, what is my acceleration?**


 * 6) If I push on a 10 kg block with a force of 8 N, what is the acceleration?**


 * 7) If I push on an object with a force of 18 N, and it accelerates at a rate of 2 m/s2, what is the object’s mass?**


 * 4) What is the difference between mass and weight?**


 * 5) If you take an object to the Moon, will its mass be the same as it is on Earth? Will its weight be the same?**


 * 6) Which object would accelerate more: a big one or a small one?**


 * 7) Describe Kepler’s First Law**


 * 8) Describe Kepler’s Second Law**