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Bot GPT 3.5 The correct answers are 1) non-contact forces and 2) unbalanced forces.
Non-contact forces, such as gravity or magnetism, can affect the motion of an object without physical contact. For example, the force of gravity always pulls objects towards the center of the Earth, causing them to accelerate towards the ground.
Unbalanced forces occur when the net force acting on an object is not zero. This means that the forces acting on an object are not balanced, resulting in a change in motion. For instance, if two people are pushing a box in opposite directions with different amounts of force, the box will experience an unbalanced force and will move in the direction of the stronger force.