P8 Flashcards
Difference between vectors and scalars
Vector has direction scalar doe not.
What is a scalar quantity?
A scalar quantity is a physical quantity that has magnitude only and no direction.
What is a vector quantity?
A vector quantity is a physical quantity that has both magnitude and direction.
True or False: Mass is a vector quantity.
False
Fill in the blank: The formula for calculating force is _____ = mass × acceleration.
force
What is the difference between speed and velocity?
Speed is a scalar quantity that refers to how fast an object is moving, while velocity is a vector quantity that refers to the speed of an object in a specific direction.
What does the term ‘resultant force’ mean?
The resultant force is the single force that has the same effect as all the individual forces acting on an object.
True or False: Weight is a scalar quantity.
False
What does it mean for forces to be balanced?
Forces are balanced when the resultant force is zero, resulting in no change in motion.
Fill in the blank: A force that causes an object to accelerate is called a _____ force.
unbalanced
What is friction?
Friction is a force that opposes the motion of an object.
True or False: The direction of a vector can be changed without changing its magnitude.
True
What is the Pythagorean theorem used for in physics?
The Pythagorean theorem is used to calculate the magnitude of a resultant vector when two vectors are perpendicular.
What does the term ‘net force’ refer to?
Net force is the vector sum of all the forces acting on an object.
Fill in the blank: If an object is at rest, the net force acting on it is _____ zero.
equal to
What is an example of a scalar quantity?
Examples include temperature, mass, and time.
What is an example of a vector quantity?
Examples include displacement, velocity, and force.
What is the principle of superposition in the context of forces?
The principle of superposition states that the resultant force acting on an object is the vector sum of all individual forces acting on it.
True or False: The weight of an object changes depending on its location in a gravitational field.
True
What is inertia?
Inertia is the tendency of an object to resist changes in its state of motion.
Fill in the blank: The law of universal gravitation states that every mass attracts every other mass with a force that is _____ to the product of their masses and inversely proportional to the square of the distance between their centers.
proportional
What is the effect of unbalanced forces on an object?
Unbalanced forces cause an object to accelerate in the direction of the resultant force.
