Chimics Flashcards
Change in motion
Set an object in motion: to kick a ball
Stop an object in motion: stop a moving ball
Speed up an object: to kick a slow moving ball
Slow down an object in motion: to slow down a fast moving ball
Make an object turn: hitting a ball with a raquet
What is a force
A force is a push or a pull on an object that results from the interaction with another object
What is a receiver
A receiver has the force acting on it
What is an agent
An agent exerts the force
How many object to need to interact for a force to exist
2 objects
Change in shape :
Compress or expand an object: squeezing a sponge
Bend or deform an object:to change the shape of clay
Break an object: drop an egg on the floor
Magnitude
The greater the strength of a force, the longer the vector that represents it : 25 newton
Direction
Forces are always exerted in a direction
The arrowhead point in the direction of the force:
———> this is the direction
Point of application
This is the point on the receiver at which the force is applied.
Two forces are equal if their — and — are the same
Magnitude and direction
Net force
The net force is the sum of forces acting on an object
Contact forces
Contact forces only occur when two object are in physical contact with each other : the force one hand exerts shaking another hand
Action at a distance forces
Action at a distance forces are interactions between objects that are not in physical contact with each other : the force a magnet exerts on an iron ball
Gravity
Gravity is the force with which all objects attract each other by simply having mass
Pressure
Pressure is the ratio of force exerted to the surface area over which that force is applied
Inertia
Inertia is the tendency of objects to resist a change in their motion
An object the at rest
An object is said to be at rest if it does not change its position with respect to its surroundings with time.
An object in equilibrium
An object in equilibrium is if all the object acting on it are balanced so that the net force is zero
Friction
As an object moves across a surface it causes friction. The friction force opposes the objects motion Example: A book sliding on the table, a ball rolling on the floor.
Normal force
is the force that supports the weight of an object on a surface, acts in the opposite direction of gravity. Most often, we see this with objects at rest on a horizontal surface, like a book on a table or someone standing on a floor
Tension
Tension force. A force that is transmitted through a string, rope, cable or wire when it is pulled tightly Example- A cable car or climbing a mountain using a rope.
A motionless object is always — but an object in equilibrium is not necessarily —
In equilibrium, at rest
The unit of mesure of force is the —
Newton (N)
Weight
The weight of an object on Earth is equal to the pull of gravity with which the earth attracts it.
