Fill in the blanks: 1. When a spring is pulled, the is proportional to the ( called law.
2.Weight is the force of on an object due to the pull of the
3. Weights and other forces are measured in
4. Here on Earth, the pull of gravity on a mass of 1 kg is Newtons
5. Weight is measured by a balance and from place to place
6. Newton's first law says: every mass stays at or moves at constant in a line unless a resultant acts on it
7. To move in a orbit, an object must have a force on it