Science 3rd Qtr - May the FORCE be with you... Flashcards
Is it true that force is applied in everyday activities?
True
Force can be measured using a device called _______
force measurer
A ______ is a push or pull upon an object resulting from the object’s interaction with another object
force
Example of a force measurer?
spring balance
Is a device that stretches according to the amount of force applied. The larger the force, the more stretched the spring balance becomes.
spring balance
Force is measured in units called ______.
newton
In symbol, newton is written as _____.
N.
Example of unit of mass?
kilogram
Formula of force?
Force (weight) = mass (m) x gravitational acceleration (g)
Is it true that forces occur in pairs?
True
How does force affect objects?
Change in size and shape
Change in motion
Change in direction
There are different types of forces acting on objects all the time. Forces may be classified as a _______ or ________ force.
contact
noncontact
Is it true that contact forces are more commonly seen and observed?
True
There is a force that opposes motion. It is called _______.
friction
Example of a contact force.
friction
Does friction also produce heat?
Yes
How do you manage friction?
By using rollers or wheels, you reduce the surface in contact to effectively reduce friction.
Using lubricants such as oil, wax, grease and powder allow moving surfaces to slide smoothly over one another.
True or False: Smooth surfaces produce less friction, while rough surfaces produce more.
True
Is a type of force that acts on objects without touching them?
noncontact force
Examples of noncontact force?
gravity and magnetism
Is a force that pulls objects toward the center of the Earth. It is an attractive force.
Gravity
Is a noncontact force that pulls like needles, nails, paper clips and even from a distance.
magnetic force
Magnets come in different shapes and sizes. It has two poles, the ____ and _____.
north pole
south pole
Is it true that opposite poles of two magnets attract while like poles repel?
True
Objects that are attracted by a magnet are classified as __________.
magnetic materials
Objects that are not attracted by a magnet are classified as ________.
nonmagnetic materials
Is a type of magnets that keep their magnetism all the time.
permanent magnets
Is a type of magnets that work only when electricity is passed through them.
temporary magnets
