Prototype U2

3. a large amount of something
6. the way in which living things change and develop over millions of years
8. physical, especially violent, strength, or power
9. the speed at which an object is travelling
13. a quality of an object that is a measure of the force by which the earth attracts it
14. the increase in something's speed
15. something physical such as a force that has size and direction

1. a unit used to measure force
2. a value, discovered by measuring, that corresponds to the size, shape, quality, etc. of something
4. the amount or number of something, especially that can be measured
5. an activity, such as a job, that a person uses physical or mental effort to do, usually for money
6. the power and ability to be physically and mentally active
7. the use of a new idea or method
10. the amount of space that is contained within an object or solid shape
11. something that has size but no direction
12. something suggested as a reasonable explanation for facts, a condition, or an event