Inertia is (1 point)
A. the resistance of an object to change its motion.
B. a moving object's speed and direction.
C. an object's motion.
D. a force that acts on a resting object.
A. the resistance of an object to change its motion.
You are sitting in a stopped bus. When the bus starts moving forward, you appear to move backward relative to the bus. Which statement best explains this observation? (1 point)
A. The force of inertia on you balances the force from the motion of the bus.
B. Inertia prevents the force of the bus from acting on you.
C. The bus moves forward, while inertia keep you in place.
D. The motion of the bus creates an unbalanced backward force on you.
B. Inertia prevents the force of the bus from acting on you.
Which statement best explains why a paper airplane eventually falls to the ground? (1 point)
A. Inertia acts as a balanced force that slows the airplane and pulls it down.
B. The force from throwing the airplane loses strength as the airplane moves.
C. The unbalanced forces of air resistance and gravity slow the airplane and pull it down.
D. Inertia creates the new forces acting on the airplane to keep it up.
C. The unbalanced forces of air resistance and gravity slow the airplane and pull it down.
A. the resistance of an object to change its motion.
The correct answer is A. the resistance of an object to change its motion.
To determine the correct answer, we need to understand the concept of inertia. Inertia is a property of matter that describes its tendency to resist changes in its motion. It is directly related to an object's mass. The greater the mass of an object, the greater its inertia, and the more it resists changes in its motion.
Option A correctly describes inertia as the resistance of an object to change its motion. This is why it is the correct answer.
Option B, "a moving object's speed and direction," is not an accurate description of inertia. Inertia is not specifically related to the speed and direction of a moving object, but rather to any changes in its motion.
Option C, "an object's motion," is too broad of a definition and does not specifically address the resistance to changes in motion, which is the defining characteristic of inertia.
Option D, "a force that acts on a resting object," is incorrect. Inertia is not a force, but rather a property of matter. It describes the tendency of an object to maintain its state of rest or motion unless acted upon by an external force.