Forces Flashcards
What is a force (1)
A force is a push or pull affect as a result of a reaction between objects.
What is a force measured in(1)
The unit that force is measured in is called Newton (N)
Who is Issac Newton (4)
- Isaac Newton was a English physicist in the 17th century.
- He is known as the most influential scientist.
- He formulated laws to declare the movement of objects.
- He had a great breakthrough in science.
Discusse newtons first law of motion (4)
- A object that is in rest stays in rest.
- Object in motion stays in motion, -Unless an unbalanced force works in on it.
Discusse newtons second law of motion (3)
-If a force is acted upon an object causes acceleration.
-The greater the mass is the greater the force is needed for acceleration.
-The formula is force = mass x acceleration
F = M space X a
Name the three characteristics of force (3)
- All forces have an origin
- all are applied in a certain direction
- they all have an effect (visible/invisible)
Discusse newtons third law of motion (3)
- Every action has a reaction
- that as equal in size
- and opposite in direction
Force can’t be observed, but an ____ can (1)
Effect
Name the seven effects of a force (7)
- Brings an object in rest to motion.
- Brings an object in motion to rest.
- Change the motion’s speed.
- Changes the motion’s acceleration.
- Changes the motion’s direction.
- Changes the objects shape.
- No visible effect
What is a contact force (3)
- A force between two or one objects
- the surfaces is in direct contact with each other.
- It needs the surface or contact for acceleration.
Name and describe the six types of contact forces (6)
Frictional:
Force acted upon when an object moves over another
Tension:
The force is transmitted through a string or a rope when pulled into the opposite direction
Normal:
A force acting upon a body that it is in contact with that is in rest
Air resistance:
Frictional force between an object and air.
Applied force:
A force applied by person onto an object where effect is visible
Spring Force:
The force applied by an outstretched or compressed spring on the object it is connected to
What is a non-contact force and give examples (4)
The force applied without contact present. E.g.:
- Magnetism/ magnetic force
- Electrostatic force
- Gravitational force
Define magnetism (4)
- Magnetism is the characteristics of iron, nickel, colbat
- and and alloy (a mixture of metals)
- to attract/repel and object.
- Amount of iron will determine the strength of the magnets.
Define the poles of magnetism (3)
- most magnets have a south and north pole.
- If the same poles are facing eachother, they will repel
- the opposite poles are facing each other they will attract.
Explain artificial/natural magnets (2)
- A magnet is either natural or artificial (man made).
- Lodestone is found in nature and has natural magnetic forces
What are magnetic field(4)
- when an object exerts magnetic effect
- (attractions/repels)
- it will affect the objects in the area.
- It is indicated with magnetic field lines
Why does the Earth have magnetic fields (3)
- The Earth has a large % of iron, therefore it has magnetic fields
- the iron is in liquid form
- there is a constant flow which causes the polls to shift.
Explain the Earth’s to types of poles (4)
The Earth has geographic and magnetic poles
- the graphic is seen on the world map
- the magnetic Pole is determined by the iron in the Earth
- changes over long periods of time
True or false: a magnet can only be in the shape of a ring (1)
False
Explain attraction(2)
- Two magnets when held close to each other, exert a force on each other.
- Two opposite poles will exert attraction towards each other
Explain repulsion (1)
Two similar poles will exert a force of repulsion on each other
What is electrostatic force (9)
- All matter consist of protons (positive charge),
- neutrons (no charge)
- and electrons (negative charge).
- Electrostatic electricity is when the electrons from one atom moves to another.
- The one atom now has less protons than the other.
- This one will be positively charged.
- The other one has more electrons and protons.
- This one will be negatively charged.
- The opposite charges attract each other and the similar charges will repel each other.
What is gravitational force (1)
The force with which two objects attract each other
Name the two factors that determine the strength of gravitational force (2)
- The mass of the object in relation to the other
- the distance between the two objects
Does only the Earth have gravitational properties (3)
- No, gravitational force is mostly known as the force that the Earth use to attract objects.
- However it can be the force between any two objects.
- The Earth is the only thing that is big enough to make an effect on objects.
What is Newton and how is force measured (5)
- Neaton is the unit forces measured in.
- Weight = force, yet it is measured in kilograms.
- The direct link between two units are easily converted from one to the other.
- 1 kg = 9, 8066 capital N is equal to 10.
- If you weigh 40 kg the Earth exerts an attraction forces of 400 N on your body
