Lab 2 Kinematics PHY250L”
Student Name:
Access Code (located on the underside of the lid of your lab kit): AC-UGWZX85
Pre-Lab Questions”
1. What is the acceleration of a ball that is vertically tossed up when it reaches its maximum
height?
Because of gravity’s downward force, the ball’s velocity is 9.8m/s2 at its maximum height.
2. If you drop a ball, and then one second later drop a ball identical in mass, size and shape,
what happens to the distance between them as they fall?
The distance between the balls will increase the longer that the balls are in the air.
3. What does a positive and negative slope represent for a velocity versus time graph? Having
a positive slope indicates that the acceleration is positive, and if it is a negative slope that
means that the acceleration is negative.
4. In one of your experiments, you will roll a marble down a ramp to provide an initial horizontal
velocity. Suppose you start the marble at rest (vo = 0 m/s) and it travels a distance of, d,
down the ramp. Use 1-D kinematics to predict the velocity of the ball (vf ) at the bottom of the
ramp. Hint: the acceleration of the ball down the ramp is 9.81*sin(θ) m/s2 where θ is the
angle of the ramp. Record you answer in variables (you will calculate the velocity with
magnitudes when you perform the experiment).
V= √2gd(sin0) m/s
5. Use the kinematic equations to derive a general equation for the time it takes a ball dropped
from rest at vertical height, h, to reach the ground.
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Lab 2 Kinematics PHY250L”
T= √2h/g
6. Use the result from Question 2 to write a general equation for the distance travelled by a
projectile that is rolling off a table of height, h, with a horizontal speed, v0x.
S= v0x * √2h/g
7.
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