Newton's First law

Newton's First law

​At the end of this lesson, you should be able to explain and apply Newton's First Law of Motion

Poll

Why is your body thrusted forward in a car when it brakes suddenly?

• body was not firmly seated in car

• your body continues to move at the same speed the car was moving at

• the seat pushes you forward

Multiple Choice

What is Newton's First Law

• F=ma

• Every action has an equal and opposite reaction

• An object at rest stays at rest, an object in motion stays in motion.

• Friction

​Because there is no unbalanced force to stop it (no matter in space).

Multiple Choice

Newton's 1st Law is also called the Law of ...

• Friction

• Inertia

• Unbalanced forces

• Newtons

Multiple Select

Which of these are GREAT example of inertia?

• a person flying through the windshield during a car wreck because they weren't wearing their seat belt

• a person staying in the vehicle and hitting the air bag during a car wreck because they are wearing a seat belt

• earth constantly traveling at the same speed in it's orbit

• a meteor traveling through space at a constant speed until it hits something

Multiple Choice

The law of inertia (Newton’s First Law) applies

• to both moving and nonmoving objects
• only to moving objects
• only to objects that are not moving

Multiple Choice

What is the net force?

• 5 N
• 45 N to the left
• 5 N to the right
• 45 N to the right

Multiple Choice

An automobile you are riding in suddenly stops, but you continue to go forward.

• Newton's
  1st
  Law of Motion
• Newton's
  2nd
  Law of Motion
• Newton's
  3rd
  Law of Motion

Multiple Choice

Which one is balanced?

• top
• bottom
• both

Multiple Choice

8 N to the left , and 4 N to the right. Find the net force. Is this balanced? 

• 12 N Right  No
• 4 N Left  No
• 12 N Right  Yes
• 4 N Left  Yes

Multiple Choice

Find the net force: 15 N to the right, and another 15 newtons to the right.

• 0 N Right
• 0 N Left
• 30 N Left
• 30 N Right

Multiple Choice

8 N to the left , and 4 N to the right. Find the net force. Is this balanced? 

• 12 N Right  No
• 4 N Left  No
• 12 N Right  Yes
• 4 N Left  Yes

Multiple Choice

Why is the net force 0 in the image?

• Because the elephants are the same size
• Because they are both pulling the same amount of force in opposite directions
• Because they are elephants
• Because they are pulling away from each other.

Multiple Choice

One object has twice as much mass as another object. The first object also has also twice as much...

• velocity
• gracitational acceleration
• inertia
• all of these

Multiple Choice

Because of inertia, a resting object will remain at ________.

• rest
• a constant speed
• school
• inertia 

Multiple Choice

An object in motion tends to stay in motion unless an ___ force acts on it.

• unbalanced
• balanced

Multiple Choice

What kind(s) of objects have inertia?

• all objects with mass
• only objects at rest
• only objects in motion
• only objects whose motion is being changed

Multiple Choice

The ______of an object tends to make the object resist being set into motion.

• mass
• force
• motion
• unbalanced forces 

Multiple Choice

The tendency of an object to resist a change in its state of motion is called the object's ______.

• incline

• straight line

• friction

• inertia