Newton's laws

​1st Newton's law

This happens when the forces are BALANCED.

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​Forces are balanced when the sum of forces is equal to ZERO.

Example of balanced forces

Sum of forces is equal to ZERO

Objects are remaining at rest

Multiple Choice

Are the forces balanced in this example?

• YES

• NO

Multiple Choice

If both teams are pulling with the same amount of force... what will happen?

• No one moves at all

• The team with the boy in yellow will win

• The team with the boy in green will win

• The team will move back and forth

Multiple Choice

If we try to move the books with a force of 10 N.

In which case will the stack of the books move with a GREATER acceleration?

• 3 kg

• 5 kg

Multiple Choice

In which case will the globe spin with a GREATER acceleration?

• applying a 10 N force

• applying a 20 N force

Multiple Choice

Imagine you throw 4 different balls with the same amount of force. Which one will go farthest?

• a 3 kg ball

• a 5 kg ball

• a 10 kg ball

• a 8 kg ball

Fill in the Blanks

A 68 kg runner exerts a force of 59 N.

What is the acceleration of the runner?

Round answer to two decimals (no units)

Fill in the Blanks

A crate is dragged accros an ice covered lake. The box accelerates at 0.08  $\frac{m}{s^2}$  and is pulled by a 47 N force. What is the mass of the crate?

Round answer to one decimal (no units)

Multiple Choice

When you fire a gun, the bullet comes out with a force which creates a similar recoil (culatazo) force in the gun. How come the acceleration is not the same? 

Why does the bullet come out with much more acceleration than the gun's acceleration moving backwards?

• The force is not the same

• The mass is not the same

• The security in the gun

• Depending on the way you fire a gun

The mass is not the same!

​The bullet's mass is much smaller than the gun.

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​According to the third law, both forces should be the same. Therefore, to compensate the difference in mass the acceleration is greater in the bullet than in the gun.

Multiple Choice

When this man steps out of the boat to the dock, what will happen to the boat?

• Will stay there

• Will sink

• Will move backwards

• Will move forward

​Go back and review the material to make sure you have understood and taken all the necessary notes.

• ​When ready click the link on the next slide and complete the quiz.

• ​Must get a minimum score of 80.

• Repeat the quiz as many times as you can before the end of class.

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