Physics 2

Electricity Section 1 A punch in the face is an electric field force. I wish I could with the you know who. Electricity Section 1 Electric Force 〉What force is responsible for most everyday forces? 〉The electric force at the atomic and molecular levels is responsible for most of the everyday forces that we observe, such as the force of a spring and the force of friction. • electric force: the force of attraction or repulsion on a charged particle that is due to an electric field Electricity Section 1 Electric Force, continued • The electric force is also responsible for effects that we cannot see. – Bonding of atoms to form molecules is also due to the electric force. • Electric force depends on charge and distance. – The electric force between two objects is proportional to the product of the charges on the objects. – The electric force is inversely proportional to the square of the distance between two objects. Electricity Section 1 Electric field + Electricity Section 1 Electric Field Lines The electric field lines around a positive charge point outward. The electric field lines around a negative charge point inward. Electricity Section 1 Electric Force, continued • Electric force acts through a field. – electric field: the space around a charged object in which another charged object experiences an electric force – One way to show an electric field is by drawing electric field lines. – Electric field lines point in the direction of the electric force on a positive charge. Electricity Section 1 Electric Field Lines Two positive charges repel each other. The positive charge is twice as large as the negative charge. Electricity Section 1 Electric Force, continued • Electric field lines never cross one another. • The field lines near two like charges point away from each other, and show that the charges repel each other. • Field lines show both the direction of an electric field and the relative strength due to a given charge. – More lines are drawn for greater charges to indicate greater force.