Answer:
b. Force is directly proportional to acceleration and mass. Objects with bigger mass and higher acceleration can produce bigger forces.
c. Forces are vectors - they always have magnitude and direction.
g. Forces of equal magnitude but in opposite directions have a zero net force and so are in a balanced state- at rest or in motion.
Explanation:
a. Forces are scalar quantities - they do not need direction.
False - forces are vector quantities, thus have both a magnitude and direction
b. Force is directly proportional to acceleration and mass. Objects with bigger mass and higher acceleration can produce bigger forces.
True - From Newton's 2nd Law 
, we see that force is directly proportional with acceleration and mass.
c. Forces are vectors- they always have magnitude and direction.
True
d. Objects at rest do not have any force acting on them.
False - Counterexample: an object laying at rest on a table has both normal force and the force of gravity acting on it.
e. Gravity only acts on objects that are falling.
False - Gravity acts on any object within the general universe. For an object to experience zero gravity, it would have to be in a vacuum or an infinite distance away from all objects in space.
f. Forces always require the Agent and the Receiver to touch to take effect.
False - Counterexample: Gravity is a no-contact force
g. Forces of equal magnitude but in opposite directions have a zero net force and so are in a balanced state- at rest or in motion.
True - Forces of equal magnitude and opposite direction will cause an object to have zero net force in the respective direction, assuming there are no other forces acting on the object.
