What is required to change the velocity of an object?

A force is required to change an object's velocity.

What does an object’s change in velocity depend on?

It depends on the direction of the force exerted on the object.

What effect does a stronger force have on velocity?

A stronger force causes a greater change in velocity.

How does cause-and-effect help in science?

It helps you infer what led to a particular result.

What happens when you push or pull an unmoving object?

It can make the object start moving.

What happens when you push or pull a moving object?

It can make the object speed up, slow down, stop, or change direction.

Do all forces have the same strength?

No, forces vary in strength.

What does the strength of a force affect?

It affects how much an object's velocity changes.

What is friction?

A force exerted in the opposite direction of motion, causing velocity to decrease.