- The motor effect is sometimes demonstrated using the apparatus shown. A current flows through a wire 'swing. The swing hangs in a magnetic field. When the current is switched on, the swing is pushed out of the field.
-copper 'swing'
steel support rods
to power supply
a What will happen if the connections to the power supply are reversed?
b What will happen if the magnetic field is reversed?

vapour or gas assuming atmospheriv pressure

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

3. dark matter

empty space could also be a simple vacuum