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Page 407-408
Review Key Terms
2. c
3. c
4. a
5. a
6. equal force acting on an object in
opposite direction.
• 7. the types of surfaces involved.
• 8. the object’s masses and distance.
• 9. the leaf has greater surface area.
• 10. it moves based on its mass and
• 11. The force the four children are exerting
on the object balanced one another.
• 12. Fluid friction usually less than sliding
friction. By bathing the parts of the
machine in oil, friction is reduced.
• 13. The yo-yo exerts a downward force on the
string. Whatever or whomever is holding the
string exerts an equal upward force.
• 14. Newton’s second law states that force is
equal to mass multiplied by acceleration.
• 15. You can throw your empty jet pack away
from the space station. As result, the reaction
force exerted on you by the jet pack will
accelerate you toward the space station.
• 16. Student’s drawings should resemble
the art in figure 21, with Earth’s
gravitational force directed toward the
center of Earth and perpendicular to the
satellite’s motion. Yes, the satellite is
accelerating because it is changing
• 17. When you squeeze a sponge you use
• 18. The skateboard stops, but your inertia
causes you to keep moving forward.
• 19. The net force is 90N to the right. The
acceleration is 9m/s/s.
• 20. The friction force is equal to the
pushing force because the book moves at
a constant velocity.