4. If a 30.0 kg crate is pushed across a horizontal surface at a constant velocity, (K) a. the force acting forward is greater than the force acting backward b. the net force has a value directed forward c. the net force is zero d. the forces acting on the crate are "unbalanced" e. there may be no force acting backward 5. The action and reaction forces in Newton's third law: (K) a. act on the same object b. act on different objects c. are equal only when an object is at rest d. are equal only when an object is moving with uniform motion e. are equal only when the object is experiencing an unbalanced force 6. A newton (N) can be represented with the base units: (K) a. kg.m/s b. g.cm/s c. kg.s/m d. kg.m/s e. kg.cm/s