Chapter 3 (Mass and weight)

Question 1

What are the types of non-contact forces

Answer 1

-gravitational force
-electrostatic force
-magnetic force

Question 2

What are the types of contact forces

Answer 2

-friction
-air resistance
-normal force
-tension

Question 3

What is the difference between mass and weight

Answer 3

Mass
-the amount of matter in a body
-SI unit is kg
-scalar quantity
-independent of gravitational field strength
-measured with beam balance or electronic balance
Weight
-the gravitational force acting on an object that has mass
-SI unit is N
-vector quantity
-dependent on gravitational field strength
-measured with spring balance

Question 4

What is gravitational field

Answer 4

a region in which a mass experiences a force due to gravitational attraction

Question 5

What is gravitational field strength

Answer 5

The gravitational force per unit mass placed at that point

Question 6

How to calculate gravitational field strength

Answer 6

g=W/m
W (weight)
m (mass)
g (gravitational field strength)

Question 7

How to calculate acceleration without air resistance

Answer 7

F=ma
F (force)
m (mass)
a (acceleration)