Introduction to Force
In science, a force is a ______ or a _______ exerted on an object.
push or a pull
is a contact force that resists motion between two objects.
Friction
Newton's first law is also known as
inertia.
Magnetic force is affected by
distance
2 types of electric charge
negative and positive
Every time you see a change in an object’s motion, the change in motion was caused by a ________.
force
is a force of attraction between objects due to their masses
Gravity
Formula for Newton's second law
F=MA
Two types of magnetic force
pull and push
repulsion and attraction
Electric force is affected by 2 factors
distance and magnitude
A __________ is a way to model the forces acting on an object
force diagram
Differentiate mass and weight.
Mass is the amount of matter in an object. Weight is a measure of the pull of gravity on that mass.
Relate mass and acceleration.
as mass increases, acceleration decreases.
In some materials, such as iron, the north poles of groups of atoms can line up in the same direction in areas called __________.
magnetic domain
Two particles with strong positive charge are moving toward one another. What will happen?
increase repulsive electric force
2 type/categories in classifying different types of forces.
contact and non contact force
Why do you not normally notice the gravitational pull of other objects?
too little mass to exert enough force for us to notice effects.
Relate mass and inertia
more mass means more inertia
In a small iron particle made of 200 atoms, the north poles of 100 atoms are pointed right and the north poles of another 100 atoms are pointed left. Describe the net magnetic force exerted by the iron particle?
ZERO
When the amount of net charge on an object changes, electric charges are never created or destroyed. Instead, charges have been ____________ between objects.
transferred
How do you determine the net force?
Add the forces.
The strength of the force between two objects depends on the
masses of the objects and on the distance between them.
If you have two objects with 2 different mass, one is 10g and the other is 20g. How can you move both with the same acceleration?
Force 2 is twice the force of Force 1
Why do some objects made up of iron or metal does not have a magnetic force?
the atoms are not aligned/ no magnetic domain
How can you transfer or move charges from one object to another?
add force