8th Grade Science Forces & Motion Quiz

What does the origin in a reference frame represent?

• The starting point of motion

• The zero point in the reference frame

• The speed of the object

• The direction of motion

What does a negative sign in a force indicate?

• The force is acting in the direction defined as negative

• The object is moving slower

• The object is slowing down

• The force is weaker

What is the formula for speed?

• Mass × Acceleration

• Force ÷ Mass

• Change in position ÷ Change in time

• Change in time ÷ Change in position

What does a flat line on a position-time graph indicate?

• The object is at rest

• The object is accelerating

• The object is moving at constant speed

• The object is slowing down

What does a straight slanted line on a position-time graph represent?

• The object is slowing down

• The object is at rest

• The object is moving at constant speed

• The object is accelerating

What does a horizontal line on a speed-time graph indicate?

• The object is moving at constant speed

• The object is slowing down

• The object is at rest

• The object is accelerating

What is the sum of forces when forces are balanced?

• Equal to zero

• Depends on the direction of forces

• Less than zero

• Greater than zero

What happens to an object when the sum of forces is zero?

• The object speeds up

• The object slows down

• The object's motion does not change

• The object changes direction

What is inertia?

• The speed of an object

• The ability to move faster

• The force acting on an object

• The resistance to changes in motion

What happens to motion when the sum of forces is not zero?

• The object moves at constant speed

• The object moves in a straight line

• The object remains at rest

• The object's motion changes