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a. inclined plane b. pulley c. wedge d. lever

1. When you bend your arm at the elbow, the bones and muscles in your arm are acting as a system. What simple machine does this system represent?. a. inclined plane b. pulley c. wedge d. lever. 2. On Earth, a box has a mass of 50 kg. On the Moon, the box would have. a. greater mass

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a. inclined plane b. pulley c. wedge d. lever

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  1. 1. When you bend your arm at the elbow, the bones and muscles in your arm are acting as a system. What simple machine does this system represent? a. inclined plane b. pulley c. wedge d. lever

  2. 2. On Earth, a box has a mass of 50 kg. On the Moon, the box would have a. greater mass b. greater weight c. the same mass d. the same weight

  3. 3. An LED light source is more efficient than an incandescent light bulb. This is true because an LED light source converts less electrical energy into which of the following types of energy? • Heat • Sound energy • Kinetic energy • Light

  4. 4. All atoms have a central nucleus. Which of the following particles make up the nuclei of most atoms? • Protons and electrons • Neutrons • Protons and neutrons • Electrons

  5. 5. The temperature of a substance is the average amount of kinetic energy of its particles. Which of the following substances has particles with the least average kinetic energy? • Frozen yogurt • Hot tea • Cold milk • Warm syrup

  6. 6. Wires connect a battery to one bulb, the first bulb to a second bulb, and the second bulb to a battery. If the second bulb is removed, what happens to the first bulb? • It stays the same • It gets brighter • It gets dimmer • It goes dark

  7. 7. The Sun is approximately 150,000,000 km from Earth. There is no physical connection between the Earth and the Sun. Yet the Sun keeps Earth in orbit. What accounts for this phenomenon? • Magnetism • Gravity • Solar radiation • The Sun’s rotation

  8. 8. An oil tanker is moving due east. What additional data would you need in order to describe the velocity of the ship? • Its speed • Its longitude and latitude • Its mass • The time it left port

  9. 9. Convection currents move energy through the atmosphere. Which statement describes the characteristics of a convection current? • Cooler, denser air rises over, less dense air • Cooler, denser air sinks beneath warmer, less dense air. • Warmer, denser air rises above cooler, less dense air. • Cool air warmed by warm air.

  10. 10. Water is more dense than air. If a sound travels at a certain speed in water, then in air the sound will travel • Faster. • At the same speed. • Slower. • At a speed that can be faster or slower.

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