Forces
Opening a classroom door.
Applied force
physical contact
Contact force (Applied and Frictional)
Charges that remain in one area, unless it is released or discharged by another object.
Stationary charges
A material used when washing dishes.
Rubber gloves (increase friction)
Anton walked on a carpeted flooring. When he touched the doorknob, he suddenly felt a mild shock. What caused this phenomenon?
Static Electricity
Gravitational force
Keeps the planets that orbits around the sun.
Noncontact force (Gravitational)
Electron, proton, and neutron.
Subatomic particles
Found in the shoes of basketball and soccer players, and also mountain climbers.
Spikes (increase friction)
Riddle is pushing a large refrigerator, but it's not moving. What caused this phenomenon?
Frictional Force
Metals getting pulled from the sand.
Magnetic force
North and south poles
Noncontact force (Magnetic)
A form of energy that results from the flow of charges through materials such as metals.
Electricity
Used in machine gears.
Grease/oil (reduce friction)
They are made from magnetic materials.
Artificial Magnets
A train slowing down.
Frictional force
Contact forces (Frictional)
Release of electric current.
Static discharge
You can't carry it because of its weight.
Heavy objects (increase friction)
These are the strongest natural magnets.
Magnetite and Lodestone
A man lifting a bucket.
Applied force.
Acts at a distance.
Noncontact forces (Gravitational and Magnetic)
The natural occurrence of static discharge.
Lightning
Found in carts and trolleys.
Wheels (reduce friction)
A force that affects everything with mass.
Gravitational force