Forces and Motion

The north poles will repel each other.

A sandy beach.

A smooth piece of glass.

Increase the force used when throwing the ball.

The south end of another bar magnet.

Friction is the resistance that one surface or object encounters when moving over another.

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

Increasing the surface area generally does not significantly affect the amount of friction; it is more dependent on the nature of the surfaces in contact.

Like poles repel each other, while opposite poles attract.

Smoother surfaces reduce friction, allowing the object to roll faster, while rougher surfaces increase friction, slowing it down.