Mechanics Flashcards
Scalar quantities have _______ but not direction.
Magnitude.
_______ is a physical quantity that has magnitude and direction.
Vector.
What is the time interval?
It is the time that elapses between 2 instants in time.
Is there acceleration when an object is moving at a constant direction?
No, there is no acceleration.
Which forces are contact forces?
Friction, Normal Force, Spring, Tension, Thrust, and Drag are contact forces.
Which is not a non-contact force? A) strong nuclear force B) electromagnetic force C) weight D) air resistance
D) air resistance
What is the study of how and why objects move?
Dynamics.
Newtons are the SÍ units for force, what are the imperial units?
The imperial units for force are pounds.
What is an example of Newton’s first law?
A car not being able to stop on an icy road.
Newton’s second law says that an object’s acceleration is ______ proportional to the net force and _______ proportional to the objects mass.
Directly, inversely.
What is Newton’s third law?
For every action force there is a reaction force that is equal in magnitude and opposite in direction.
What is kinematics?
Kinematics is the study of motion.
T or F?
On a VT graph a stopped vehicle will be shown as a flat line.
False- It will be stopped when it is on the x axis.
T or F?
On a VT graph positive acceleration means that velocity is speeding up.
False- If velocity was in a negative direction and the acceleration was in a positive direction it would slow down.
On a PT graph what does it mean if there is a straight line?
It means there is uniform motion.
Does a car driving around a circular track have a constant velocity?
No, because the position is always changing.
T or F?
Two forces that are equal but acting in opposite directions on the same object is one of Newton’s laws.
False- The forces act on two objects.
T or F?
The vector sum of two or more forces acting on an object is the net force.
True.
