A force can be a push or pull on an object.
A force can cause a resting object to move. Or when an object is already moving, a force can help it accelerate. Forces are measured in Newtons. The net force is the overall force acting on an object after all the forces are combined. When the forces on an object are balanced, the net force is zero and there is no change in the object's motion. When the forces on an object are unbalanced, the object accelerates.
Friction is a force that opposed the motion of objects. There are four main types of friction; static friction, sliding friction, rolling friction, and fluid friction. Static friction is the force that acts on objects that are not moving. Sliding friction is a force that opposes the direction of motion of an object as it slides over a surface. Rolling friction is a force that acts on rolling objects and opposes that motion. Fluid friction is a force that opposes the motion of an object moving through a fluid. Air resistance is a fluid friction that acts on an object moving through the air.
Newton's Laws of Motion
1. An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force. This is also known as the law of inertia.
1. An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force. This is also known as the law of inertia.
2. Acceleration is produced when a force acts on a mass. The greater the mass of the object being accelerated the greater the amount of force needed to accelerate the object.
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3. For every action there is an equal and opposite re-action.