1-1 What is force?
OBJECTIVES:
Define force and give some examples of forces in nature.
Identify balanced and unbalanced forces and describe their effects.
Key Terms
force: a push or a pull
balanced forces: forces that are equal in size but opposite in direction
unbalanced forces: forces that cause a change in the motion of an object
Lesson Summary
• A force is a push or a pull.
• Forces that are equal in size and opposite in direction are called balanced forces.
• Unbalanced forces change the motion of an object.
• When unbalanced forces act on an object at rest, the object will move.
• When unbalanced forces act on a moving object, the motion of the object will change. The object may speed up, slow down, stop moving, or change direction.
Define force and give some examples of forces in nature.
Identify balanced and unbalanced forces and describe their effects.
Key Terms
force: a push or a pull
balanced forces: forces that are equal in size but opposite in direction
unbalanced forces: forces that cause a change in the motion of an object
Lesson Summary
• A force is a push or a pull.
• Forces that are equal in size and opposite in direction are called balanced forces.
• Unbalanced forces change the motion of an object.
• When unbalanced forces act on an object at rest, the object will move.
• When unbalanced forces act on a moving object, the motion of the object will change. The object may speed up, slow down, stop moving, or change direction.