c03 dynamics I: mass and weight

Question 1

definition of mass and SI unit and scalar or vector?

Answer 1

measure if the amount of substance in a body
SI unit: kilogram (kg)
scalar

Question 2

definition of weight and SI unit and scalar or vector?

Answer 2

gravitational force acting on an object with mass
SI unit: newton (N)
vector

Question 3

definition of gravitational field

Answer 3

region where a mass experiences a force due to gravitational attraction

Question 4

definition of gravitational field strength, formula and SI unit

Answer 4

defined as gravitational force per unit mass placed at that point
g=w/m
SI unit: N/kg

Question 5

acceleration due to gravity

Answer 5

F=ma

Question 6

measuring mass

Answer 6

beam balance or calibrated electronic balance

Question 7

measuring weight

Answer 7

spring balance, bathroom scale, electronic balance

Question 8

mass and weight difference

Answer 8

mass is:
An amount of matter
A scalar quantity
SI unit: kilogram (kg)
Independent of the gravitational field strength
Measure with beam balance or a calibrated electronic balance

weight is:
A gravitational force
A vector quantity
SI unit: newton (N)
Dependent on the gravitational field strength
Measured with spring balance

Question 9

types of forces and examples

Answer 9

contact (frictional force, air resistance, tension and normal force) and non-contact (gravitational force, electrostatic and magnetic force)