Physical Science (Grade 8) Midterm — Quick Check, Units 4–6

Part 1: Multiple Choice

1. A swimmer pushes water backward and moves forward. Which law does this show?
   1. A. Newton's second law
   2. B. Newton's first law
   3. C. Newton's third law
   4. D. The law of conservation of mass
2. Which force opposes motion between two surfaces that are touching?
   1. A. Magnetism
   2. B. Gravity
   3. C. Buoyancy
   4. D. Friction
3. A car speeds up from 0 m/s to 20 m/s in 4 seconds. What is its acceleration?
   1. A. 5 m/s²
   2. B. 24 m/s²
   3. C. 16 m/s²
   4. D. 80 m/s²
4. Using KE = ½mv², what is the kinetic energy of a 2 kg ball moving at 3 m/s?
   1. A. 6 J
   2. B. 9 J
   3. C. 18 J
   4. D. 3 J
5. What energy change happens in a solar panel?
   1. A. Chemical energy to light energy
   2. B. Thermal energy to chemical energy
   3. C. Electrical energy to light energy
   4. D. Light energy to electrical energy
6. Using GPE = mgh with g = 9.8 m/s², what is the potential energy of a 5 kg object 10 m above the ground?
   1. A. 50 J
   2. B. 98 J
   3. C. 490 J
   4. D. 4,900 J
7. What happens when the north poles of two magnets are brought together?
   1. A. They repel each other
   2. B. They lose their magnetism
   3. C. They attract each other
   4. D. They become electrically charged
8. In a simple series circuit with three bulbs, what happens if one bulb burns out?
   1. A. The other bulbs flicker on and off
   2. B. Only that bulb goes out
   3. C. All the bulbs go out
   4. D. The other bulbs get brighter
9. What is the highest point of a transverse wave called?
   1. A. Crest
   2. B. Trough
   3. C. Frequency
   4. D. Wavelength
10. Which type of electromagnetic wave carries the most energy?
    1. A. Microwaves
    2. B. Gamma rays
    3. C. Visible light
    4. D. Radio waves