year 3 Lecture 1 recap of principles

What is the difference between Mass and Weight?

• Weight is applied to animate objects, mass is applied to inanimate objects

• Weight is mass x gravitational acceleration

• Mass is measured in N and weight is measured in Kg

• Your mass can change but your weight stays the same

Force is a vector quantity. What do we mean by vector quantity?

• All sides of the force add to 180 degrees

• Vector quantities have a magnitude and direction

• Vector refers to solely the size of the force

What is the unit of force?

• Kg

• N

• Nm

• NmN

What is the value of acceleration due to gravity?

• -9.81

• -19

• 10.23

What is Newtons First Law?

• A body will continue in a state of rest or uniform motion unless acted upon by an external force

• Force = mass x acceleration

• For every action there is an equal and opposite reaction

What is Newtons Second Law?

• A body will continue in a state of rest or uniform motion unless acted upon by an external force

• Force = mass x acceleration

• For every action there is an equal and opposite reaction

What is Newtons Third Law?

• A body will continue in a state of rest or uniform motion unless acted upon by an external force

• Force = mass x acceleration

• For every action there is an equal and opposite reaction