Forces.

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Presentation transcript:

Forces

What is a force? A PUSH or PULL is a FORCE. So, a good definition for force is a push or pull in a particular direction. Forces affect how objects move.

What is a force? Forces can affect motion in several ways: They can make objects start moving They can make objects move faster They can make objects move slower They can make objects stop moving They can make objects change direction They can make objects change shape

Force facts Forces are measured in Newtons (N) Forces usually act in pairs Forces act in a particular direction Forces usually cannot be seen but their effects can

Force Facts More than one force can act on an object at a time. The forces can push or pull in any direction. What happens to the object when the forces act depends on two things: How strong the forces are The direction of the forces When more than one force acts on an object, the forces combine to form a net force. The combination of all the forces acting on an object is the net force.

Force facts Forces may work together or they may be opposite forces Two or more opposite forces are balanced forces if their effects cancel each other and they do not cause a change in an object’s motion. If two forces of equal strength act on an object in opposite directions, the forces will cancel, resulting in a net force of zero and no movement. If the effects of the forces don’t cancel each other, if one force is stronger than others, the forces are unbalanced forces. Unbalanced forces cause a change in motion; speed and/or direction.

Force facts When two forces act in the same direction on an object, the net force is equal to the sum of the two forces When two unequal forces act in opposite directions on an object, the net force is the difference of the two forces The final force and its direction are called a resultant.

What is a force? A free body diagram (FBD) shows where a force or forces is/are being applied Directional arrows represent which was the force is being applied The size of an arrow determines how much force is applied The larger the arrow, the greater the force.