# Acceleration and Freefall Prelab Assignment

Name:_________________________ Lab Section:________ 4-digit Code Number:____________

1. Which of the following statements is correct for an object released from rest, freefalling in the Earth's gravity? (Neglect air resistance.) Circle all true statements.
1. the object falls 9.8 m during the first second of time
2. during each second the object falls 9.8 m
3. the average speed during the first second of time is 4.9 m/s
4. the acceleration changes by 9.8 m/s2 every second
5. the acceleration of the object is proportional to its weight

2. Consider the following graphs (note the axes carefully). Which of these represent one-dimensional motion at constant speed? Circle all that apply.

1. I.
2. II.
3. III.
4. IV.
5. V.

3. A golfer drives a golfball in a high arcking trajectory, a parabola that is concave down. The range is non-zero. Neglect air resistance. When the ball is at the highest point in its flight,
1. its velocity and acceleration vectors are both zero.
2. its velocity vector is zero, but its acceleration vector is nonzero.
3. its velocity vector is nonzero, but its acceleration vector is zero.
4. its velocity and acceleration vectors are both nonzero.
5. none of these.

4. A projectile fired vertically upward from ground level is in the air for 6.00 seconds before returning to the ground. What was the speed of the projectile at launch? Use g = 9.80 m/s2.

5. Solve these equations for vox in terms of xf, yf, and ay by eliminating t.

yf = ½ ay t2
xf = vox t

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