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Lara navigates her kayak down a stretch of the Savannah river in 15 minutes. Her rate of speed over the course of the trip is 8 km/hr. How far has she traveled? . 0.12 km 1.2 km 2 km 120 km. 2. Find the amount of work done when 30 N of force is used to lift a box 400 cm. . 370 J 12 J

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## 0.12 km 1.2 km 2 km 120 km

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**Lara navigates her kayak down a stretch of the Savannah**river in 15 minutes. Her rate of speed over the course of the trip is 8 km/hr. How far has she traveled? • 0.12 km • 1.2 km • 2 km • 120 km**2. Find the amount of work done when 30 N of force is used**to lift a box 400 cm. • 370 J • 12 J • 120 J • 12,000 J**3. How fast will an object in free fall be moving after 3**seconds? • 9.8 m/s • 19.6 m/s • 29.4 m/s • 39.2 m/s**4. Stella stands in an elevator on a scale. She presses the**down button. The reading on the scale decreases for a moment. What is the BEST explanation? • Stella’s mass has decreased • Stella’s acceleration has changed • The force of gravity has decreased • The force of gravity has increased.**5. Name the type of wave that carries no energy.**• Gamma rays • Visible light • Radio waves • All waves carry energy**6. Energy from the Sun is transported by**• Mechanical waves • Electromagnetic waves • Sound waves • Compression waves**7. What are the units of frequency**• Seconds (s) • Hertz (Hz) • Joules (J) • Meters (m)**8. Which of the following is true regarding mechanical**waves? • Mechanical waves must travel through matter. • Mechanical waves can travel through matter and space. • Mechanical waves can only travel through a vacuum. • Mechanical waves can change matter.**9. The height of a wave is its**• Amplitude • Wavelength • Period • Crest**10. Sound waves cause molecules to vibrate and bump into one**another. For sound to travel, there must be molecules which can be made to vibrate. The closer together the molecules are, the faster the sound is able to travel. This explains why • Sound travels faster in steel than water • Sound travels faster in outer space than in air. • Sound travels faster in air than in water • Sound travels faster in water than in steel.

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