1. SECTION 2: FORCES AND DYNAMICS GOHS
IB SL PHYSICS: TOPIC 2
SECTION 2: FORCES AND DYNAMICS
GOHS

2. Force, weight and mass Force is a pull or a push. For example:
Friction
Normal or contact
Tension & compression
Air resistance
weight

3. Force, weight and mass Weight is the pull of gravity on the mass.
Measured in Newtons (N)
g = 9.8 ms-2
Is a force (a vector)
Mass is amount of matter of an object
Measured in kilograms (Kg)
A scalar

4. Force, weight and mass On the Earth On the Moon Weight = 70 N
Clothes fit real good!
On the Moon
Weight < 70 N
Clothes still fit real good!

5. Force, weight and mass Sample problem:
What is the weight of a 1.0 kg mass on the surface of the earth where g = 9.8 ms-2?
W = mg

6. Force, weight and mass
W = (1.0 kg) (9.8 ms-2)
W = 9.8 N