Name Date Block Review for Test on Universal Gravitation and Electrostatics Test is on: Please bring a completed (in your own handwriting) and corrected packet to the test. You will be able to use it on the test and it will be collected with the test. You are responsible for knowing how to use the scientific notation mode on a calculator to solve these problems. s you will need: m m F G r g q q F K r 1 1 = E = When to use: When to use: Units of Fg : Direction of Force: Units of FE : Direction of Force: Constant G: Constant K: m1 and m: q1 and q: r: r: Important Values you will need: ELECTRON Mass (m) = 9.11 x 10-31 kg Charge (q) = -1.6 x 10-19 C PROTON Mass (m) = 1.68 x 10-7 kg Charge (q) = +1.6 x 10-19 C
Newton s Law of Universal Gravitation Gravitation Force between large masses like planets and the sun. Table of important values 1. What is the force of gravity between Jupiter and the Sun? m1 = m = m m F = G r 1 r = G = ( ) ( ) F = ( ) ( ). Stan (mass = 100 kg) is standing on the surface of Jupiter. What is the force of gravity between Stan and Jupiter? m1 = m = m m F = G r 1 r = G = ( ) ( ) F = ( ) ( )
Finding the gravitational constant (g) for any planet or moon. THE UNITS FOR THIS ARE m/s This will be the acceleration due to gravity on the planet. 3. What is the gravitational constant for Earth? m= r= gearth= ( )( ) ( ) The gravitation constant for Earth is 4. Find the gravitational constant for Jupiter. m= gjupiter= ( )( ) r= ( ) The gravitational constant on Jupiter is 5. Find the gravitational constant for Mercury. m= r= gmercury= ( )( ) ( ) The gravitational constant on Mercury is
Electrostatics - BASICS 6. Draw and label a diagram of an atom that is: a. positively charged b. negatively charged c. neutral 7-14 Explain why these statements are FALSE. 7. Unlike charges repel 8. The electrons of an atom reside in the nucleus. 9. To charge two neutral objects you only need to touch them together once. 10. Protons move easily through substances call conductors. 11. Current electricity flows easily through insulators. 1. An object with no charge (like a piece of paper) is ONLY attracted to both negatively charged objects. 13. To make an object negatively charged you remove protons from it. 14. Static electricity is the kind of electricity that builds up on an object especially conductors.
Charging by Friction If we did a study of many materials and put them in order from those with the least desire for electrons to those with a very strong desire for electrons we would have created a Triboelectric series. If two items from the list are rubbed together, then the item that is higher on the list will end up more positive and the lower one will end up more negatively charged. Triboelectric series 15. Fill in the blank. a. The items higher on the list want to electrons. b. The items lower on the list want to electrons. c. The farther apart the items are the electrons will transfer. 16. What happens when you rub a balloon (synthetic rubber) on your hair? Draw a BEFORE, DURING and AFTER picture of what happens. Write the charges of objects in the BEFORE and AFTER sections. Show the direction of any electron movement in the DURING. BEFORE DURING AFTER Charging by Induction 17. When you bring a negatively charged ruler near small pieces of neutral pieces of paper an Electric Force is clearly present. Draw a picture of what happens inside the paper below. - - - - - - -negatively charged ruler - - - - - small piece of paper
Forces present on small particles like electrons and protons. 18. Find the Gravitational Force between two electrons that are 1.87 x 10 - meters apart. Is the Gravitational Force attractive or repulsive? 19. Find the Electric Force between two electrons that are 1.87 x 10 - meters apart. Is the Electric Force attractive or repulsive?