Force
A force is a push, pull or twist when two objects interact
Drag
Friction between a moving object and the air it is moving through
Friction
Force that acts to oppose the motion between two surfaces as they move over each other
Fulcrum
Turning point of a lever
Gravity
The force of the attraction that objects have on one another due to their masses
Lever
Simple machine that reduces the effort needed to do work
Load
Resisting force
Lubrication
Using a lubricant, such as oil or grease, to decrease friction
Net force
Combination of all forces acting on an object
Newton
The unit used to measure force. Named after sir isaac newton
Ramp
Simplest type of inclined plane
Spring balance
Device consisting of a spring and scale, used to measure forces in the laboratory
Unbalanced forces
Two or more forces that are unequal in size and direction and therefore change an objects speed, direction or shape
Work
The energy used to move an object over a set distance
Work = force x distance
Types of forces
Contact- Non contact-
Friction Gravity
Air resistance Magnetism
Buoyancy Upwards force in water
Normal force
Newtons first law of motion
Inertia- when an object is in motion will stay in motion and an object is stationary will stay still unless acted upon
Newtons second law of motion
Force = mass x acceleration Force = newtons
Mass = KGs
Acceleration = M/S2
Newtons third law of motion
Opposite and equal reaction to any force
First class lever
Load/resistance, fulcrum, effort
EG. Seesaw, scissors
Second class lever
Fulcrum, load/resistance, effort
EG. Nut cracker, wheel barrow
Third class lever
Fulcrum, effort, load/resistance
EG. Tongs, tweezers
Net force
If net force is on one side = add
If net force is on opposite sides = subtract