1. It will stay at rest due to inertia.
2. acceleration
3. The couch will move to the left with a force of 1 N.
5. 6 N
6. Friction pulls the skates' wheels westward.
7. velocity
8. its speed increases due to gravity
10. It will have a constant velocity until acted upon by outside forces.
11. 35 N
12. mass
13. sliding friction
14. The couch will move with a force of 6 N.
15. It is pushing up on the book.
16. gravity
18. There is less friction between the car tires and the ice than between the car tires and the road.
20. balanced.
21. Due to centripetal force, the water is pushing on the bottom of the bucket.
22. a high velocity and a large mass
23. Scientists in other countries use SI units when measuring speed
