force

A force is a push or pull that can change the motion of an object. Forces can be big or small, and they can be applied in different directions.

Some examples of forces include:

• Gravity pulls objects down towards the Earth.
• Friction is a force that resists the motion of two objects that are touching.
• Air resistance is a force that opposes the motion of objects through the air.
• Thrust is a force that propels objects forward.

Forces can be measured in Newtons (N). One Newton is the force that is needed to accelerate a mass of 1 kilogram by 1 meter per second squared.

The force of the wind blew the tree down.