2.3 Practice: Force and Newton's 1st Law

Which picture shows balanced forces?

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• 
• 
• 

Which picture shows unbalanced forces?

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• 
• 
• 

Tags

NGSS.HS-PS2-1

Explain how balanced and unbalanced forces affect an object’s motion differently.

Groups:

(a) Balanced Forces

,

(b) Unbalanced Forces

• Causes an object's motion to change

• Net force is 0 N

• Net force is greater than 0 N

• No change in motion

Tags

NGSS.MS-PS2-2

There are forces acting on an object at rest.

• True

• False

Tags

NGSS.MS-PS2-5

What is the net force on an object that has balanced forces acting on it? Type the number and the unit.

Tags

NGSS.HS-PS2-1

The net force acting on the books in the picture is ​ (a)   ​ Newtons to the ​ (b)  

• 4
• right
• 10
• left
• down
• up
• 21
• 2.33

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

The net force acting on the books in the picture is ​ (a)   ​ Newtons to the ​ (b)  

• 6
• right
• 18
• left
• down
• up
• 2
• 72

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Two students push on a box in the same direction and a third student pushes in the opposite direction. What is the net force on the box if each student pushes with a force of 50 N?

(Hint: It may help to draw a picture.)

• 50 N in the direction that the 2 students are pushing together.

• 50 N in the direction that the 1 student is pushing.

• 150 N in the direction that the students are pushing

• 150 N in the direction that the 2 students are pushing together.

Tags

NGSS.MS-PS2-2

Why is Newton’s 1st Law also known as the Law of Inertia? There are multiple answers.

• Because objects in motion want to stay in motion

• Because its momentum is equal to its mass times its velocity

• Because objects resist change in motion

• Because objects at rest want to stay at rest

The more ________ an object has, the more inertia it has.

Tags

NGSS.MS-PS2-2