A Levels Physics

In an experiment to determine the acceleration of free fall g, a ball bearing is held by an
electromagnet. When the current to the electromagnet is switched off, a clock starts and the ball
bearing falls. After falling a distance h, the ball bearing strikes a switch to stop the clock which
measures the time t of the fall.
If systematic errors cause t and h to be measured incorrectly, which error must cause g to
appear greater than 9.81 ms-2?
A h measured as being smaller than it actually is and tis measured correctly
B h measured as being smaller than it actually is and t measured as being larger than it
actually is
Ch measured as being larger than it actually is and t measured as being larger than it actually
is
D
h is measured correctly and t measured as being smaller than it actually is


Kinematics | 2015 - M/J - 9702/12 | Q7