Question

question #4
what is the term used for the force that an object exerts back on you when you push it?
a. action force
b. reaction force
c. gravity
d. friction
question #5
according to the text, what is the force that propels a rocket into space?
a. the force of the rocket engine pushing against the air
b. the force of gravity pulling the rocket upwards
c. the force of the expelled gas pushing the rocket forward
d. the force of the rocket’s weight pushing it down
question #6
what is the main reason why you feel resistance when pushing a heavy box?
a. the box is too heavy for you to move
b. the box is pushing back on you with an equal and opposite force
c. the floor is rough and creates friction
d. the air is pushing against the box
question #7
what is the relationship between force pairs and newton’s third law of motion?
a. newton’s third law explains why force pairs exist.
b. force pairs are a different concept from newton’s third law.
c. newton’s third law describes how to calculate force pairs.
d. force pairs are a specific example of newton’s first law of motion.
question #8
why is understanding force pairs important in physics?
a. it helps us understand how objects move, stop moving, and change direction.
b. it helps us calculate the speed of objects.
c. it helps us predict the weather.
d. it helps us understand the composition of matter.

Explanation:

• Question #4: By definition, the force an object exerts back when pushed is a reaction force, matching Newton's third law.
• Question #5: Rockets use Newton's third law; expelled gas exerts an equal opposite force to propel the rocket.
• Question #6: The resistance felt is the box's equal and opposite reaction force to your push, per Newton's third law.
• Question #7: Newton's Third Law directly defines that for every action, there is an equal and opposite reaction, explaining force pairs.
• Question #8: Understanding force pairs (Newton's third law) is key to analyzing how forces interact to affect object motion, speed changes, and direction shifts.

Answer:

Question #4: B. Reaction force
Question #5: C. The force of the expelled gas pushing the rocket forward
Question #6: B. The box is pushing back on you with an equal and opposite force
Question #7: A. Newton's Third Law explains why force pairs exist.
Question #8: A. It helps us understand how objects move, stop moving, and change direction.