Page 23 - Science Course 2 (Book 2)
P. 23
Direction: On each line, write the term that correctly completes the sentence
3. Because forces have directions, you must specify a(n) when you combine forces.
4. A force exerted in that direction is , and a force exerted in the opposite
direction is .
5. The combination of forces acting on an object is the .
Mo8-L2: Key Concept Check
Direction: On the line before each item, write B if it represents balanced forces or U if it represents
unbalanced forces.
1. a book lying on a table
2. an airplane cruising in level f ight
3. a rock falling from a cliff
4. a bridge collapsing in an earthquake
5. a train rounding a curve at a steady speed
6. a man sitting on a park bench
7. the space shuttle taking off
8. a satellite in orbit
9. a car maintaining a constant speed on a straight road
10. an airplane landing
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