Forces Flashcards
Forces
What is a force?
Is a pull/push that can change:
The size of a body
The shape of a body
The body’s motion
-it is a vector quantitiy
-SI units is Newtons(N)
Forces
What is used to represent a force
A Force is represented by an arrow & a line indicating magnitude and direction.
Types of Forces
What are the 2 types of forces?
Contact & Non-Contact Forces
Contact Forces
What are contact forces?
Contact forces are those that occur as a result of direct contact between bodies.
Contact Forces
What are the different catagories of contact forces?
- Applied force
- Frictional forces
- Tension
- Spring force [f=kx]
- Normal reaction
Contact Forces
What is an applied force?
An applied forces is a a force that is applied directly to a body.
The two bodies must be in contact.
eg. lifting a weight/pushing a chair.
Contact Forces
What is friction/frictional force?
Friction is a force the opposes the motion of a body on a surface.
Contact Forces
What is tension?
A ‘pull’ force that is applied by using a string, cable, cord etc.
Contact Forces
What is spring force?
Spring force is the amount of force to stretch or compress a spring.
Contact Forces
What is a normal reaction force?
Normal reaction(NR) is a perpendicular force acting upwards from the surface supporting the weight of the object.
It is always act at ninety degrees from a surface.
Non-Contact Forces
What is a non-contact force?
Non-contact forces are those that occur as a result of invisible force feilds acting on bodies.
Non-Contact Forces
What are the types of non-contact forces?
Attractive Forces:
- Nuclear forces
- Gravitational Force
Repulsive & Attractive Forces:
- Electic/Electromagnetic Force
- Magnetic Force
Attractive Forces
What is nuclear force?
The force acting within the nucleus of an atom keeping the protons and neutrons inside.
Attractive Forces
What is gravitational force?
The weight is the force of gravity activity downwards on a body’s mass.
Gravitational Force
How is weight calculated?
by finds the product of a body’s mass & its acceleration due to gravity/gravitational feild strength, (g).
on earth g=10
