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Forces and pressure (Kaelen), Solutions:, image, image - Coggle Diagram
Forces and pressure (Kaelen)
What are forces?
Push
E.g. typing, scratching
Pull
E.g. opening a door, lifting an object
Its measured in newtons(N)
Can be measured by:
Dynamometer
Spring balance
Effect of forces
Change shape of object
Change size of object
Change the direction of a moving object
Change the speed of a moving object
Stop a moving object
Make a stationary object moving
There are 2 types of forces
Contact
e.g. Frictional force
Non-contact
e.g. Gravitational force
Friction
What is it?
It
opposes
the motion of an object
so it slows/stops a
moving object
It can be both useful and annoying
Advantages of FF
Helps us walk/run (without slipping)
Writing
Holding onto objects
Slow objects down
Disadvantages of FF
Wear & tear
Wastage of energy
Produces heat
Need more force to move objects
Problems:
FF on surfaces can wear out objects and slow them down
Gravitational force
What is it?
Gravity is a force that pulls.
It acts between 2 objects without contact.
Magnitude can be changed by
__
Mass of the object
Object with
more mass = more GF
E.g. Earth's mass > Moon's mass
So, Earth's GF > Moon's GF
Distance between the 2 objects
More dist = less GF
GF causes objects to have weight
Weight = how much GF is acting on an object
More mass = more weight
What is grav field strength?
Amt of GF acting on a 1 kg weight
Solutions:
Use lubricants e.g. oil/grease
Use ball bearings/wheels
smaller contact area
Use a cushion of air
Less contact with ground
"float" above the ground, e.g. Hovercraft
Decrease FF
