Charging
Electric charge
What are electric charges of electron, proton, and neutron?
Magnetic force
How to arrange two bar magnets so that they repel each other?
Field direction
What's the gravitational field direction of the spherical object?
Non-contact force
Is the electric force a non-contact force?
Charge transfer
What is transferred during charging two insulators?
Magnetic poles
What are full names of the two types of magnetic poles?
Field strength 1
What's the strength of the gravitational field on the surface of the Earth?
Field direction
What's the field direction of a positively charged sphere?
Charging insulators 1
How can an insulator become negatively charged?
Field strength
Where is the magnetic field from a bar magnet strongest and weakest?
Field strength 2
Give two factors that determine the gravitational field strength?
Field strength
How to tell the field strength from an electric field diagram?
Charging insulators 2
How can an insulator become positively charged?
Field pattern
Why is a compass needed in magnetic field investigation?
Mass vs weight
What's the mass of a man who weighs 750 N?
Electric force 1
Charging insulators 3
Why is the charge of two insulators when rubbed together the same?
Earth's magnetic poles
What is the magnetic pole of the Earth's North Pole? Why?
g.p.e.
A physic textbook on a shelf stores 30 J of g.p.e. The book weighs 22.5 N. How high the book is from the ground?
Electric force 2
Does a charged insulator attract a neutral object? Why?