Force and motion study guide

what is newtons first law of motion?

Inertiadefine

define inertia

Inertia is the property of an object to resist changes in its state of motion, meaning it will remain at rest or continue moving at a constant velocity unless acted upon by an external force.

An object at rest stays at rest
An object in motion stays in motion at the same speed and direction
Unless acted on by an unbalanced force

What is newtons second law?

Acceleration

What is Acceleration?

6. When an unbalanced force acts on an object, it accelerates

6. More force means…(law 2)

6. more acceleration

less force…(law 2)

less exceleration

large mass (law 2)

small acceleration

small mass…(law 2)

large accelerationwhta

what is the formula for force?

F = m × a

What is newtons third law?

Action Reaction

Action Reaction rule:

Every action force has a reaction force that is

• equal in size

• opposite in direction

for the Actin reaction law, do all forces always happen singly or in pairs?

pairs

15. Reaction forces:

• You push on desk → desk pushes back on you

• Bat hits ball → ball pushes back on bat

• Finger presses screen → screen pushes back on finger

what law is pushing a block

2

what law is a hammer hitting a nail

3rd

what law is a person staying in motion

1st

speed formula

• Speed = distance ÷ time

distance formula

• Distance = speed × time

Time formula

Time = distance ÷ speed

Distance-Time Graph:Straight line up on a graph

@ constant speed

Distance-Time Graph:curved line on a graph

accelerating

Distance-Time Graph:flat line on a graph

stopped

Distance-Time Graph:Downward line on a graph

moving back toward start

Velocity-Time Graph: upward line

accelerating

Velocity-Time Graph: flat line

 constant velocity

Velocity-Time Graph:Downward line

slowing down (decelerating)

• 1st Law =

• staying the same

• 2nd Law = force causes acceleration

• force causes acceleration

• 3rd Law =

• action-reaction pairs