Forces in balance- Chapter 8 Flashcards
What is displacement?
Distance without changing direction.
What is a vector quantity?
A physical quantity that has magnitude and direction. OH YEAH!
What is a scalar quantity?
A physical quantity with magnitude but no direction.
What does the length of the arrow in a vector diagram represent?
The magnitude of the vector quantity.
What does the direction of the arrow in a vector diagram represent?
The direction of the vector quantity.
What three things can forces change about an object?
- The shape of the object.
- The motion of an object.
- The object’s state of rest.
What is the unit of a force?
Newtons (N)
What is a contact force?
A force that only acts on objects when the objects are touching.
Describe the forces exerted by two interacting objects.
Equal and opposite forces.
According to Newton’s first law of motion, if the forces acting on an object are balanced, the resultant force on the object is zero, and?
- If the object is at rest, it stays stationary.
- If the object is moving it keeps moving with the same speed and in the same direction.
If two forces act on an object with zero resultant force, the forces must?
- Be equal to each other.
- Act in opposite directions.
When the resultant force on an object is not zero, the forces acting on the object are?
-Not balanced.
What is resultant force?
-Single force that has the same effect as all the forces acting on an object.
If the resultant force on an object is zero…
The object stays at rest/at the same speed and direction.
If the resultant force on an object is more that zero…
The speed or direction of the object will change.
