1What is a force?
It is a push or pull
2What are some instruments to measure force?
Compression Balance, Spring Balance, Forcemeter or Newton meter
3What is the SI unit of force?
Newtons (N)
4What are the 2 categories of forces?
Contact and non-contact (action-at-a-distance forces)
5What are examples of non-contact forces?
Gravitatiional, Magnetic & electric force
6What is mass and it’s SI unit?
It is the measure of the amount of substance or matter in a body. SI unit: kg
7What is weight and it’s SI unit?
It is the measure of the gravitational force acting on a body. SI unit: Newtons (N)
8Does weight vary with gravitational field strength?
Yes, as gravitational field strength increases the weight of an object also increases
9What are some instruments to measure mass and weight respectively?
Beam balance or electronic balance; spring balance
10What is gravitational field?
It is a region in which a mass experiences a force due to gravitational attraction.
11What is gravitational field strength
The gravitational field strength, g, is the gravitational force per unit mass
12What is the formula for weight
$W = mass \times gravity$
13What is density
It is the mass of substance in a unit volume
14What is the formula for density
$Density = \frac{Mass}{Volume}$
15A denser object sinks or floats
Sinks
16What is pressure?
It is the force acting per unit area
17What is the formula for pressure
$Pressure (pa\space aka\space N/m^2) = \frac{Force (N)}{Area(m^2)}$
18How can pressure be increased?
By increasing the force and decreasing contact area