1. Materials
Egg
Styrofoam cup
Cupcake
Shell shapes (ice cream cones)

2. POS

3. Unit D: Structures and Forces
Topic 3: Mass and Force
…force of gravity

4. Weight on other planets

5. The Metric System SI measurement: International System of Units Mass
amount of matter/particles
measured in kilograms (kg)
1kg = 1000 g

6. Force Is a push or pull Has a size and direction
Measured in newtons (N)
1 kg= 10 N

7. Conversions g to kg = divide by 1000 kg to g = multiply by 1000
kg to N = multiply 10
N to kg = divide by 10

8. Practice conversions Make a chart for practice: Use spring scales
Mass (g) mass (kg) weight (N)
Item

9. Weight vs. Mass Mass always stays the same
Measured in kg
Weight can change depending on the gravitational pull
On the moon, we weigh less, but our mass remains constant
Measured in N

10. Measuring mass and weight
Mass is measured with a Balance
Force is measured with a Force meter

11. Correct the error
The spring scale at the grocery store is used for finding the mass of the fruit
After exercise, Bob’s weight decreased by 5 kg.
As the space shuttle returned to Earth, the astronaut’s mass returned to normal