What are contact forces?
Forces between similar objects
Forces between touching objects
Forces between objects that do not touch
What is a non-contact force?
Forces between objects that are different to each other
What is the unit of force?
Joule (J)
Watt (W)
Newton (N)
Which of these is a contact force?
Tension
Attraction
Repulsion
Which of these involves a contact force?
A planet in orbit around a star
A skydiver falling through the air
Electrons attracted to the nucleus of an atom
Which of these is a non-contact force?
Friction
Reaction force
Weight
Which of these words describes the force between the north pole of a magnet and the south pole of another magnet?
Contraction
Reaction
Which of these words describes the force between two negatively charged particles?
Gravitational
Compression
What must an object have in order to be affected by electrostatic forces?
Charge
Mass
Motion
What must an object have in order to be affected by gravity?
Magnetism