Normal Force from your hands on the 1 kg object.
Gravity is being acted on the 1 kg object.
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The force used to hold a 1 kg object in your hands is gravitational force acting on the object due to Earth's gravity. This force is also known as the weight of the object.
The force used when wringing a wet cloth is primarily mechanical force generated by the muscles in your hands and arms. This force is used to twist and compress the cloth in order to squeeze out excess water.
Magnets are typically used to hold things to a fridge door. The magnetic force between the magnets and metal on the fridge door creates the holding force that keeps items in place.
A wheelbarrow typically exerts a mechanical force known as a push or pull force, depending on whether it is being pushed or pulled. This force is used to move the wheelbarrow and the load it is carrying.
Some engaging centripetal force activities include swinging a bucket of water in a circle without spilling it, spinning a ball on a string around your hand, or riding a carousel and feeling the outward force pushing you towards the edge. These hands-on activities demonstrate how centripetal force keeps objects moving in a circular path.
A mechanical clock is typically moved by a spring or weights that store energy and release it slowly to power the gears that move the hands of the clock. This stored energy is transferred through a series of gears and escapements to regulate the movement of the clock hands.