P1C - mass, weight & density

Question 1

What is weight + formula?

Answer 1

The gravitational force on an object that has mass. Measured in Newtons.
gravitational field strength (n/kg) x mass (kg) = weight (N)

Question 2

What is mass?

Answer 2

A quantity of matter in an object at rest. Measured in g,kg

Question 3

What is the gravitational field strength?

Answer 3

The force of gravity on an object per unit mass. (g). On earth, that’s 9.8n/kg

Question 4

Why will an object placed anywhere On Earth experience a force due to gravity?

Answer 4

Because of Earth’s gravitational field - a region in space where the gravity from one massive object will affect other objects that have mass.

Question 5

Why is it useful to take repeat measurements?

Answer 5

It is easier to identify errors

Question 6

What is density + unit + formula?

Answer 6

Density (p, pronounced as rho) is how much mass there is per unit volume.
Unit: g/cm^3 or kg/m^3
Mass (kg)/ volume (m^3) = density (kg/m^3)

Question 7

How to convert between g/cm^3 and kg/m^3

Answer 7

1g/cm^3 = 1000kg/m^3

Question 8

How to find the volume of an irregularly shaped solid (2 ways)?

Answer 8

1. Pour and measure the initial amount of volume of water in a measuring cylinder
2. Place the solid in the water
3. Record the new volume
4. Minus the new volume - the original volume to get the volume of the irregular solid.
   Another way is to use the eureka can, by placing the solid in a can which is connected to a tube connected to a measuring cylinder. When the solid is put inside, it displaces the water and the volume of water displaced is the volume of the solid.

Question 9

When will an object float on a liquid?

Answer 9

When it’s average density is lower than that of a liquid

Question 10

What is 1000cm^3 of water equal to in terms of volume & mass?

Answer 10

= 1dm^3
= 1 litre
= 1kg