Forces Flashcards
Definition of a contact force?
A force that only acts between objects that are touching
A definition of a force?
A force is a push, pull or twist operating on an object. Measured in newtons (N)
Definition of a non-contact force?
A force that acts only between objects even though the objects are not touching
What do like poles do?
Repell
What do non-like poles do?
Attract
Examples of non-contact forces and what they do?
- gravity, pull
- magnetic,push/pull
- static electricity, push/pull
Examples of contact forces and what they do?
- friction,push
- Buoyancy,push
- air resistance, push/drag
- surface tension,pull
- thrust,push
How is gravity useful?
Gravity helps humans and objects stay on the ground
How is a magnetic force useful?
Magnetic fields are used in the modern technology such as electric engineering and electromechanics.
How is static electricity useful?
Antistatic floors- are used in hospitals to avoid static charge.
How is friction useful?
Friction between our shoes and the ground helps us from slipping.
How is buoyancy useful?
Buoyancy keeps a boat on top of the water so it doesn’t sink
How is air resistance useful?
Wind in the sails of a sailboat. ( the moving wind meets the Resistance of the sail, and pushes the boat forward.
How is surface tension useful ?
Surface tension keeps a liquid together.
How is thrust useful?
Thrust can help an aircraft
What do you label forces with?
Newtons (N)
What is the structure of an atom?
The number of protons, neutrons, and electrons in an atom can be determined from a set of simple rules. The number of protons in the nucleus of the atom is equal to the atomic number. The number of electrons in a neutral atom is equal to the number of protons.
