Only objects in motion

All objects with mass

Only objects at rest

All objects in motion

they are not slowed down by friction

their engines are pushing them forward

they are still accelerating from their launch

they are pulled by suns gravity

they have inertia

slowing down in a straight line

constant speed in a straight line

accelerating in a straight line

accelerating in a curve

slowing down in a curve

force and inertia cancel each other out

without a force there is no motion

without a force, an object at rest stays at rest

without a force, an object in motion stays in motion

inertia causes friction

balanced forces

a net force of 0 N

a net force larger than 0 N

unbalanced forces

defines force as the cause of a change in motion

shows that friction has to be a force

defines mass as a resistance against a change in motion

connects force with acceleration

$$N$$  

$$\frac{m}{s^2}$$  

$$kg\cdot\frac{m}{s^2}$$  

$$F$$  

$$J$$  

$$F=\frac{m}{a}$$  

$$F=m\cdot a$$  

$$a=\frac{F}{m}$$  

$$a=\frac{m}{F}$$  

The force increases

The force decreases

The force is constant

The force disappeared

the heavier one applies a larger force to the lighter one

both apply the same amount of force to each other

the lighter one applies a larger force to the heavier one

the lighter one is slowed down more

the heavier one is slowed down more

Law of Friction

Law of Motion

Law of Inertia

actio = reactio

Law of Gravity

is not affected by a force

is only affected by gravity

applies the same force to earth as earth applies to the apple

applies less force to earth than earth applies to the apple

applies more force to earth than earth applies to the apple

a reaction proportional to the mass

a reaction proportional to the friction

an equal and opposite reaction

an equal reaction in the same direction

The table is pushing the book upward with a force of 10 N

The table is pushing the book upward with a force greater than 10 N

Inertia

The net force acting on the book is 0 N

is a force

is caused by gravity

is another word for mass

is directly proportional to mass

is different on the Moon and on Earth

is a force

can be caused by the inertia of air molecules

is a reaction to inertia

depends on gravity

is different for moving and stationary objects

1000 N

2000 N

4000 N

8000 N

$$1.4\ \frac{m}{s^2}$$  

$$35\ \frac{m}{s^2}$$  

$$350\ \frac{m}{s^2}$$  

$$14\ \frac{m}{s^2}$$  

2 objects to interact with each other

2 forces acting on an object

inertia

forces cancelling each other