Question

which two statements about forces are true?
a. every force requires matter to touch.
b. every force has an equal but opposite force.
c. forces organize and affect how matter moves.
d. forces are always balanced.

Explanation:

• Option A: Magnetic force (e.g., between a magnet and a nail) and gravitational force (e.g., Earth - moon) don't require matter to touch. So, this statement is false.
• Option B: Newton's third law states that for every action force, there is an equal and opposite reaction force. For example, when you push a wall, the wall pushes you back with the same force. So, this statement is true.
• Option C: According to Newton's second law \(F = ma\) (where \(F\) is force, \(m\) is mass, and \(a\) is acceleration), forces cause changes in the motion (acceleration) of matter. Forces can start, stop, or change the direction of the motion of matter. So, this statement is true.
• Option D: Forces are balanced when the net force on an object is zero (\(\sum F=0\)), but there are many cases of un - balanced forces. For example, when you push a box and it accelerates, the applied force is greater than the frictional force (un - balanced forces). So, this statement is false.

Answer:

B. Every force has an equal but opposite force; C. Forces organize and affect how matter moves.