Page 22 - Science Course 2 (Book 2)

Mo8-L2: Vocabulary Review

Direction: The sentences below include terms that have been used incorrectly. Use the terms below to
rewrite each sentence, correcting the errors so the information in the sentence is correct.
Underline each change you make.
balanced forces inertia net force
Newton’s f rst law of motion reference direction unbalanced forces
1. The rule of inertia states that if the net force on an object is zero, then an object at rest will remain at rest
and an object in motion will continue moving in a straight line with constant speed.

2. If you are moving a desk with a friend, you might use a forward direction as your net force.

3. If two people push on an object from opposite directions, but with the same amount of force, there will be
unbalanced forces and a net force of zero.

4. Inertia is the combination of forces acting on an object.

5. Balanced forces combine and form a net force that is not zero.

6. In a car accident, seat belts help restrict the reference direction of the passengers.

Mo8-L2: Key Concept Organizer

Direction: The diagrams below represent sliding forces applied to a large box. Write the net force applied
to each box on the line next to each diagram.

1.

300N –100N

100N
2.

300N

14