Physics Test #7 – Motion in Fluids

1. Why do objects experience less acceleration when falling in water compared to air?
a) Water has lower density b) Gravity is weaker in water c) Buoyant force and drag oppose motion d) Only dense objects fall

2. Terminal velocity is achieved when:
a) Weight = Buoyant force b) Net force on falling object = 0 c) Gravity > Air resistance d) Object is very heavy

3. Why are birds and planes streamlined in shape?
a) Increase resistance b) Reduce air drag c) Balance buoyancy d) Improve eyesight

4. What causes air resistance on a falling object?
a) Gravity b) Earth's magnetic field c) Collision with air particles d) Static electricity

5. The reason humans float better in saltwater is because:
a) They are lighter b) Saltwater has higher density c) There is no gravity d) Water molecules are lighter

6. A falling parachute reaches terminal velocity because:
a) It's too light to move faster b) Forces are balanced c) Wind lifts it up d) Earth's surface repels it

7. Water resistance increases with:
a) Smaller shape b) Streamlining c) Increased speed and surface area d) Less depth

8. A falling object with **air resistance** continues to accelerate until:
a) Drag exceeds gravity b) Object stops c) Net force is zero (terminal velocity) d) Buoyant force increases

9. Air pressure **decreases** with:
a) Altitude b) Depth c) Humidity d) Time

10. Which law explains why fast-moving fluids exert less pressure?
a) Newton's Third Law b) Pascal's Law c) Bernoulli’s Principle d) Archimedes’ Principle

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