Physical Quantities & Measurements
What is a quantity that has magnitude only?
Scalar
What is the product of mass and acceleration?
Resultant force
What is the product of force and displacement in the direction of the force?
Work done
What is the rate of flow of electric charge?
Electric current
What is the force per unit area acting normally on a surface?
Stress
What is a quantity that has both magnitude and direction?
Vector
What is the law stating that the rate of change of momentum is proportional to the net force acting on a body?
Newton’s Second Law
What is the energy an object possesses due to its motion?
Kinetic energy
What is the work done per unit charge as it moves between two points?
Potential difference
What is the fractional change in length of a material when stretched?
Strain
What is the type of error that causes all readings to be offset in the same direction?
Systematic error
What is the turning effect of a force about a pivot?
Moment of a force
What is the rate at which work is done?
Power
What is the ratio of potential difference to current through a conductor?
Resistance
What is the ratio of stress to strain within the limit of proportionality?
Young modulus
What is the degree of agreement among repeated measurements?
Precision
What is the tendency of an object to resist a change in its motion?
Inertia
What is the energy stored in a stretched or compressed object?
Elastic potential energy
What is the resistance of a material of unit length and unit cross-sectional area?
Resistivity
What is the property that allows a material to return to its original shape after the force is removed?
Elasticity
What is the number of base quantities in the SI system?
Seven
What is the principle that states total momentum remains constant provided no external force acts?
Principle of Conservation of Momentum
What is the principle stating that energy cannot be created or destroyed, only transformed?
Principle of Conservation of Energy
What is the energy converted per unit charge supplied by a source?
Electromotive force (e.m.f.)
What is the point beyond which a material is permanently deformed?
Elastic limit