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Unit 5- M18- L1- Electric Charge and force.pptx
- 1. Electrostatic Force Done by Ms. Wafaa Falah HS-PS2-4. Use mathematical representations of Newton’s Law of Gravitation and Coulomb’s Law to describe and predict the gravitational and electrostatic forces between objects. Unit 3 Field Forces and Energy Lesson 1 Mass and Gravitational Fields
- 2. What is the type of energy found on thunderstorm? Focus Question
- 3. Why does the rod cause the water to bend? Phenomenon Question
- 4. 11.2 What is the devices shown below? Van de graff generator Electroscope
- 5. • Static electricity is an imbalance of electric charges within or on the surface of a material. • The charge remains until it is able to move away by means of an electric current or electrical discharge Static electricity
- 6. Properties of Electric Charge • There are two kinds of electric charge. • like charges repel • unlike charges attract • All matter is made up of atoms. • Electric charge is conserved. • Positively charged particles are called protons. • Uncharged particles are called neutrons. • Negatively charged particles are called electrons. • Electric charge is a property of matter that creates electric and magnetic forces and interactions. Electric charges are either positive or negative. Visual Concept
- 7. Electric force HS-PS2-4 Success Criteria: Use mathematical representations of Coulomb’s Law to describe and predict the electrostatic forces between objects.
- 8. The force between two charged particles depends on the amount of charge and on the distance between them. Force has a direct relationship with both charges. Force has an inverse square relationship with distance. Two charges near one another exert a force on one another called the electric force Coulomb’s Law 𝑭𝒆𝒍𝒆𝒄𝒕𝒓𝒊𝒄= 𝒌𝑪 𝒒𝟏𝒒𝟐 𝒓𝟐 Electric force = Coulomb constant × charge 1 charge 2 distance 2 Coulomb’s Law 𝑭𝒆𝒍𝒆𝒄𝒕𝒓𝒊𝒄= 𝒌𝑪 𝒒𝟏𝒒𝟐 𝒓𝟐 Electric force = Coulomb constant × charge 1 charge 2 distance 2 HS-PS2-4 Success Criteria: Use mathematical representations of Coulomb’s Law to describe and predict the electrostatic forces between objects.
- 9. Coulomb’s Law, continued • The resultant force on a charge is the vector sum of the individual forces on that charge. • Adding forces this way is an example of the principle of superposition. • When a body is in equilibrium, the net external force acting on that body is zero. • The Coulomb force is a field force. A field force is a force that is exerted by one object on another even though there is no physical contact between the two objects. HS-PS2-4 Success Criteria: Use mathematical representations of Coulomb’s Law to describe and predict the electrostatic forces between objects.
- 10. Electric force Vs Gravitational force HS-PS2-4 Success Criteria: Use mathematical representations of Newton’s Law of Gravitation and Coulomb’s Law to describe and predict the gravitational and electrostatic forces between objects.
- 11. What is the electric force between a glass ball that has +2.5 μC of charge and a rubber ball that has −5.0 μC of charge when they are separated by a distance of 5.0 cm? Practice question HS-PS2-4 Success Criteria: Use mathematical representations of Coulomb’s Law to describe and predict the electrostatic forces between objects.
- 12. 1. An electric force F exists between two objects, both having the charge q. If the charge on one object is doubled to 2q, the force between the objects becomes a. ½ F b. 2F. c. 3F d. 4F 2. Electric force and gravitational force are alike in that both forces a. depend on charge. b. act only when objects are touching c. depend on mass. d. are field forces. HS-PS2-4 Success Criteria: Use mathematical representations of Coulomb’s Law to describe and predict the electrostatic forces between objects.
- 13. 3. Which of the following best represents a difference between electric force and gravitational force? a. Gravitational force is stronger than electric force. b. Electric force can both attract and repel. c. Electric force is inversely proportional to the square of the distance between objects. d. Gravitational force exists between objects that are not touching. 4. What is the electric force between an electron and a proton that are separated by a distance of 1.0 1010 m? Is the force attractive or repulsive? (e = 1.60 1019 C, kC = 8.99 109 Nm2 /C2) Felectric = 1.6 × 10-8 N HS-PS2-4 Success Criteria: Use mathematical representations of Coulomb’s Law to describe and predict the electrostatic forces between objects.