The reaction force when you place a cup on a table is the force exerted by the table on the cup in the opposite direction to the force applied by the cup on the table. This force prevents the cup from falling through the table and keeps it in place.
When a cup is placed on a table, the table exerts an equal and opposite reaction force on the cup to support its weight.
I think you are talking about reaction force. An example is an object, say a cup, on a table. The cup is attracted to the centre of the earth by gravity and would accelerate if the table was not there. The table is in the way and produces a force in reaction to the cup pressing down on it.
The force of gravity pushes the cup downwards towards the ground, while the normal force exerted by the table on the cup pushes upwards, balancing out the force of gravity and preventing the cup from falling.
The cup sitting on a table has gravitational potential energy due to its position in the Earth's gravitational field. If the cup is also filled with liquid that has thermal energy, then it would have some thermal energy as well.
The normal force exerted by a surface is a reaction force that opposes the force pressing the cup against it. The material of the cup does not affect this force because it is a result of the interaction between the cup and the surface it is resting on, not a property of the cup itself. As long as the cup is in contact with the surface, the normal force remains the same regardless of the cup material.
When a cup is placed on a table, the table exerts an equal and opposite reaction force on the cup to support its weight.
I think you are talking about reaction force. An example is an object, say a cup, on a table. The cup is attracted to the centre of the earth by gravity and would accelerate if the table was not there. The table is in the way and produces a force in reaction to the cup pressing down on it.
The force of gravity pushes the cup downwards towards the ground, while the normal force exerted by the table on the cup pushes upwards, balancing out the force of gravity and preventing the cup from falling.
The cup sitting on a table has gravitational potential energy due to its position in the Earth's gravitational field. If the cup is also filled with liquid that has thermal energy, then it would have some thermal energy as well.
The normal force exerted by a surface is a reaction force that opposes the force pressing the cup against it. The material of the cup does not affect this force because it is a result of the interaction between the cup and the surface it is resting on, not a property of the cup itself. As long as the cup is in contact with the surface, the normal force remains the same regardless of the cup material.
Yes, in a way. You place a cup on a table and don't expect the cup to move unless you push it or you tip the table so creating a slope down which the cup must move due to gravity and with the lessening friction with the table's surface. Therefore, friction and gravity combine to ensure your cup remains in place. So, a cup on a level table top will not move unless you give it a shove, so exerting an outside force.
Gravity
Matter is held down by the force of gravity, like a cup placed on a tabletop. The cup needs either for the table to be tilted, allowing gravity to cause the cup to overcome the force of friction and to slide off the table, or someone needs to push (force) the cup sideways.
The energy change that takes place as a cup falls off a table is the cup's potential energy decreases while the cup's kinetic energy increases.
The coffee spilling when bumped is explained by Newton's first law of motion, which states that an object at rest will remain at rest unless acted upon by an external force. The force from bumping the table caused the cup of coffee, which was originally at rest, to move and spill.
A table spoon is smaller than a cup, therefore; it's not possible to fit a cup into a table spoon, but there are 16 table spoons in a cup. 1/16 cup
An example of Newton's third law of motion is when you walk, your foot exerts a force on the ground, and the ground exerts an equal and opposite force back on your foot. This interaction allows you to push off the ground and move forward.