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Answer Key
Grade 8 Science: Forces, Motion & Newton's Laws Applications
1.
force
2.
force
3.
newton/N
4.
velocity
5.
ma/mass times acceleration
6.
matter
7.
gravity
8.
reaction
9.
an object stays at rest or in constant motion unless acted on by an unbalanced force
10.
acceleration of an object equals net force divided by mass (F=ma)
11.
when one object exerts a force on another, the second exerts an equal and opposite force back
12.
the combined effect of all forces acting on an object
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