Which of the following statements about inertia is NOT true?

Inertia is a force that keeps objects moving in a straight line.

Inertia is the tendency of an object to resist changes in its motion.

Objects with greater mass have greater inertia.

Inertia can be overcome by applying a force.

When an object changes position relative to a reference point.

When something is still and not moving.

Acceleration refers to

decreasing speed, changing direction, increasing speed

What is the definition of speed?

Distance traveled by an object for a unit of time.

When an object changes position.

What is the speed of an object at rest?

This cannot be determined without more information.

How can you increase/decrease friction?

Add a rough surface to increase, add lubricant to decrease.

increasing speed, decreasing speed, or changing direction

speed in a particular direction

Unbalanced forces are

When the forces of an object produce a net force not equal to zero.

when the forces of an object produce a net force equal to zero.

What is the formula for speed?

speed= Distance divided by Time

What is Newton's first law?

An object in motion stays in motion, and an object at rest stays at rest until acted upon by an outside force.

Every action has an equal and opposite reaction.

An object's acceleration depends on the mass of the object and the amount of force being applied.

What is Newton's second law?

An object's acceleration depends on the mass of the object and the amount of force being applied.

Every action has an equal and opposite reaction.

An object in motion stays in motion, and an object at rest stays at rest until acted upon by an outside force.

Three characteristics of balanced forces are

They don't change in motion. They are equal in size. The forces are opposite in direction.

constant acceleration, speed, and velocity.

causes change in motion they are not equal the move in the opposite direction.

Force & Motion Quiz For 8th Grade

Physics

NGSS

Reviewed by Matt Balanda

Matt Balanda, BS (Aerospace Engineering) |

Science Teacher

Review Board Member

Matt Balanda, a Calvary Chapel Christian School leader with a Bachelor's in Aerospace Engineering and Mathematics, transitioned from Aerospace Engineering to Education with a Master's from California Baptist University. As the High School Vice-Principal and Physics teacher, he nurtures students' love of learning and faith, creating an enriching and transformational educational experience.

, BS (Aerospace Engineering)

By A.A.

A.A.

Community Contributor

Quizzes Created: 2 | Total Attempts: 17,820

| Attempts: 16,831 | Questions: 35 | Updated: Oct 21, 2025