Gravity & Force Flashcards
Gravitational field
The region of space in which an object will experience a force due to gravity.
Elestrostatic force
The force between 2 objects caused by a buildup of negative charges.
Weight
A measure of gravitational pull on an object (N).
Examples of contact forces
- Normal force
- Friction
- Air resistance
Examples of Non contact forces
- Gravity
- Magnetic force
- Electrostatic force
Sedimentation
The process of removing solid particles heavier than water by gravity force
Movement
Living things can move on their own.
Magnetic separation
the process of using magnets to separate particular objects with magnetic properties
Emulsion, give an example
A colloid of 2 or more liquids one is a base, the other is broken into tiny droplets spread throughout.
eg. milk & butter
Why do things weigh less on the moon?
because gravity is weaker on the moon and the force is weaker, therefore making things weigh less.
Force
A force is a push or pull action upon an object.
How are forces shown in the force diagram?
as arrows that show the direction in which the force is acting.
Mass
mass is how many particles (atoms) make up an object. it is measured in kg
Gravity
It is the force that pulls objects towards the centre of the earth
Net force
The combination of all forces acting on an object.
What is the gravitational field strength on earth?
9.8 N/kg
On the moon, how many newtons is 1kg
1.6 N
what is air resistance?
Air resistance is the forces opposite to the motion of an object as it passes through the air.
When particles point in the same direction is called?
Domains
What 6 things do objects do if forces are acting on them?
- begin to move
- speed up
- slow down / stop moving
- change the direction of motion
- change shape
- remain still
Distance magnifiers
Distance magnifiers change a strong force that acts over a short distance, into a weak force that acts over a long distance.
Wedge
2 inclined planes that move through another object and change the direction of a downwards force to a sideway force.
Force magnifiers
force magnifiers can turn a weak force into a stronger force.
How do Van de Graaff generators work?
In the shaft of the machine, two belts rub together making the rounded dome positively charged.
