# Physics Module #2: Question Preview (ID: 26436)

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**What two conditions must be met before you can use the three equations we derived in this module?**

a) motion must always occur in a straight line, and the acceleration of the object must be constant.

b) motion must always have a constant velocity , and the acceleration of the object must be constant.

c) motion must always occur in a straight line, and the velocity of the object must be constant.

d) motion must always occur in a curved line, and the acceleration of the object must be constant.

**What is air resistance?**

a) Air resistance is how hard the wind is blowing.

b) Air resistance reduces the height from which objects are falling.

c) Air resistance reduces the acceleration of objects that are falling.

d) Air resistance increases the acceleration of objects that are falling.

**How does air resistance affect the acceleration of a falling object?**

a) The wind blows on the object and keeps it from falling.

b) It stops the object before it hits the ground.

c) It doesn't affect the acceleration at all.

d) Objects must shove air molecules out of the way. The molecules resist the shoving, which reduces the object’s acceleration.

**What is the definition of free fall?**

a) Free fall is the motion of an object when it is falling under the influence of gravity plus air resistance.

b) Free fall is the motion of an object when it is falling solely under the influence of gravity.

c)

d)

**A very picky physicist says that no object can really experience free fall when falling near the surface of the earth. Explain why the physicist is technically correct.**

a) Since everything close to earth will experience air resistance, nothing is falling solely under the influence of gravity.

b) The physicist is not correct. Objects will experience free-fall, especially sky-divers.

c)

d)

**If an object is thrown up in the air, where is its velocity zero?**

a) The object’s velocity is zero directly across from where the object started from.

b) The object’s velocity is zero at the maximum height that it attains.

c) The object’s velocity is zero at the beginning.

d)

**When its velocity is zero, what is its acceleration?**

a) 0 m/sec2

b) Its acceleration is always 9.8 m/sec2 downwards, even when its velocity is zero.

c) 32 m/sec2

d)

**A ball is thrown up in the air with an initial velocity of 1.2 m/sec. If the ball is caught at exactly the same height from which it was thrown, what will its velocity be?**

a) when the ball returns to the place it was thrown, it has opposite velocity. Thus, its velocity is -1.2 m/sec (or down)

b) when the ball returns to the place it was thrown, it has same velocity. Thus, its velocity is 1.2 m/sec (or up))

c) when the ball returns to the place it was thrown, it has zero velocity. Thus, its velocity is 0 m/sec.

d)

**An athlete runs at a constant velocity of 3.0 m/sec. How far will the athlete travel in 25 minutes?**

a) 45,000 meters

b) 4,500 meters

c) 450 meters

d)

**A BMW 535I can accelerate from 0.0 to 60.0 mph in 7.9 seconds. What is its acceleration?**

a) 27,000 mph2

b) 27 mph2

c) 2,700 mph2

d)

**6. A boat travels for 2.0 hours at a constant velocity of 5.0 m/sec. How far does the boat travel? (1 hr = 3,600 sec)**

a) 3,600 meters

b) 7,200 meters

c) 18,000 meters

d) 36,000 meters

**7. To measure the height of a building without a ruler or tape measure, an engineer drops a rock off the top of the building and finds out that it takes 7.9 seconds for the rock to reach the ground. How high is the building?**

a) 305.8 meters

b) 77.42 meters

c) 78.1 meters

d)

**A driver is driving down the road and sees a deer in his headlights. The driver hits the brakes, which provide a acceleration of -4.0 m/sec2. If the car’s initial velocity was 9 m/sec, how far will the car travel before coming to a stop?**

a) 162 meters

b) 10.125 meters

c) 78 meters

d)

**9. If a runner starts from rest and accelerates at .7 ft/sec2 for 2.0 minute, how far will the runner travel?**

a) 56,880 ft

b) 5,040 feet

c) 1.4 feet

d)

**1. What if the air were “THICKER” and the molecules and atoms in the air more difficult to move. Would you expect the air resistance in your experiments to be more, less, or the same as it would be if it were thinner?**

a) Air resistance should be greater. In a thicker air, it would be hard to move molecules out of the way.

b) Air resistance should be less. In a thicker air, it wouldn't take as much work to fall through the air.

c) It would be the same.

d)

**2. If the air were to be “thicker” would you expect the terminal velocity of the objects you are studying to be lower, higher, or the same as without fog?**

a) It would not change at all.

b) It would be easy for things to free fall so the terminal velocity would be higher.

c) Since sir resistance is large, it would be hard for things to free fall. The terminal velocity would be lower.

d)

**A cannon shoots its cannonball straight up in the air with an initial velocity of 500 m/sec. What is the maximum height that the cannonball can reach?**

a) 12,755.1 meters

b) 127 meters

c) 200 meters

d)

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