Front

What force slows down and stops a rolling ball?

Back

Friction

Front

What is the force exerted by a surface on an object resting against it?

Back

Normal force

Front

What is the reaction force when a cannon fires a cannonball?

Back

The cannon moving backward

Front

What force keeps a nail in place in a wooden board when turned upside down?

Back

Friction

Front

Who won the tug-of-war game if the girls pulled with 150 N and the boys with 100 N?

Back

The girls won because they applied a stronger force to the rope.

Front

What is the definition of force?

Back

A push or pull on an object.

Front

What is motion?

Back

The change in position of an object over time.

Front

What is gravity?

Back

A force that attracts two bodies towards each other, commonly experienced as the force that pulls objects towards the Earth.

Front

What is Newton's First Law of Motion?

Back

An object at rest stays at rest, and an object in motion stays in motion unless acted upon by a net external force.

Front

What is Newton's Second Law of Motion?

Back

The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass (F=ma).