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Chapter 3, Push or Pull, Gravitational Field strength on earth is 10N/kg -…
Chapter 3
Weight
Def: The gravitational force acting on an object that has mass
SI unit is
N
Gravitational Field
Def: A region in which a mass experiences a force due to gravitational attraction
Gravitational Field strength
Def: The gravitational force per unit mass placed at that point
Formula: Weight=Mass x Gravitational Field strength
Formula: Resultant force= Mass x Acceleration
Measured with a spring balance
Forces
Non contact
Gravitational force
Pull exerted by the Earth on an object
Electrostatic force
The attractive and repulsive forces between electric forces
Magnetic force
The attractive and repulsive forces between magnets
Contact
Friction
Oppose motion between surfaces in contact
Air resistance
Frictional force exterted by
air
that oppose motion
Normal force
A push exerted by a surface on an object- push always perpendicular to the surface
Tension
Pull exerted by a stretched spring
SI unit is
N
Mass
Def: The measure of the amount of matter in a body
SI unit is
kg
Measured with a Beam balance
Density
Def: defined as mass per unit volume
Formula: Density=mass/volume
SI unit is
kg/m^3
Pressure
Def:The force acting per unit area
Formula: Pressure=Force/Area
SI unit is
N/m^2
Push or Pull
Gravitational Field strength on earth is
10N/kg