Unit 1: Forces and Interactions

Equal forces acting on an object in opposite directions.

• unbalanced forces
• balanced forces

A push or pull exerted on an object.

• force
• motion

Tags

NGSS.MS-PS2-2

The state in which one object's distance from another is changing.

• motion 
• reference point

Forces that produce a nonzero net force, which changes an object's motion.

• balanced forces
• unbalanced forces

Tags

NGSS.MS-PS2-2

A unit of measurement that equals the force required to accelerate.

• Newton
• inches

Tags

NGSS.HS-PS2-1

A place or object used for comparison to determine if an object is in motion.

• reference point
• forces

The overall force on an object when all the individual forces acting on it are added together.

• net force
• motion

Tags

NGSS.MS-PS2-2

Which of the following would NOT be a good reference point?

• wheels
• tree

If the sun is the reference point, everything on Earth is in motion.

• true
• false

Tags

NGSS.MS-ESS1-1

Friction that acts on objects that are NOT moving.

• fluid friction
• static friction