les 7

• Natuurkunde / Scheikunde
• Middelbare school
• vwo
• Leerjaar 1

What did we cover

Previous lesson?

The homework

Exercise 1

Newtons.

In contact.

Lubrication.

Opposite to.

Exercise 2

Large.

Large.

Small.

Large

Todays lesson

• What is gravity?
• Mass and weight.
• The formula for weight.

Learning goals

• Explain what gravity is and what causes it.
• Describe mass and weight.
• Name the formula for weight.
• Apply the formula for weight.

What is gravity

• What is gravity?
• How do we notice gravity? What does it do?
• What causes gravity?
• Is there gravity between you and the sun? between you and me?
• 
  

0

What is mass?

What is weight?

Gravity

Mass (Kg)	Weight (N)
The amount of matter (stuff) in an object	The amount of force gravity exerts on an object.

The formula for weight

Weight=mass⋅Gravitationalfieldstrength

(N)

(kg)

(N/kg)

 Gravitational field strength of earth: 10 N/kg

Weight=mass⋅Gravitationalfieldstrength

Mass (kg)	10	20	50	100
Weight o n earth (N)

 Gravitational field strength of earth: 10 N/kg

 Gravitational field strength of the moon: 1.6 N/kg

Weight=mass⋅Gravitationalfieldstrength

Mass (kg)	10	20	50	100
Weight o n earth (N)
Weight on the moon (N)

Homework

The workbook exercises of §1.4

Learning goals

• Explain what gravity is and what causes it.
• Describe mass and weight.
• Name the formula for weight.
• Apply the formula for weight.