An experiment is conducted to study the motion of a wooden block of constant mass sliding down an inclined plane.
The plane exerts a force on the block that acts perpendicular to the surface of the plane. State the name of this force.
For an incline of angle 25∘25^\circ25∘, a student performs three trials and records the following values for the acceleration of the block down the plane:
3.45 m/s2,3.59 m/s2,3.37 m/s2 3.45\text{ m/s}^2, \quad 3.59\text{ m/s}^2, \quad 3.37\text{ m/s}^2 3.45 m/s2,3.59 m/s2,3.37 m/s2Calculate the uncertainty in these acceleration measurements.