A child sits in the back seat of the
family car, holding a helium balloon on a string. All the windows are
closed. As the car accelerates forward, does the balloon tilt forward,
tilt backward, or remain in the same place?
Balance the Beaker
The diagram
shows a balance, each pan has a glass three quarters full of water.
What happens
if you dip your thumb into one of the glasses? Is there no change or
does the pan with the thumb go lower – or higher?
