balanced and unbalanced forces

A parked truck

• balanced force
• unbalanced force

a car being towed 

• balanced force
• unbalanced force

Tags

NGSS.HS-PS2-1

a see-saw with the same weight on both sides

• balanced force
• unbalanced force

Tags

NGSS.MS-PS2-4

a person pushing on a cement wall 

• balanced force
• unbalanced force

a book rests on a table

• balanced force
• unbalanced force

a student slides a book across the table to a friend

• balanced force
• unbalanced force

Tags

NGSS.MS-PS2-2

An object that is at rest will begin to move if which of the following is true?

• The surface on which it rests is frictionless. 
• The mass of the object is sufficient. 
• Unbalanced forces act on the object. 
• Gravity on the object can be reduced.

Tags

NGSS.MS-PS2-2

The forces acting on a box are illustrated. 

• move to the right at a constant speed. 
• accelerate to the right.
• move to the left at a constant speed. 
• accelerate to the left. 

Tags

NGSS.MS-PS2-2

A student claims that unbalanced forces acting on an object in motion can cause all of the following results:
 •The object could stop moving
•The object could speed up
•The object could change directions
The best evaluation of this student’s claims is that -

• none of the claims is true.
• one of the claims is true. 
• two of the claims are true. 
• all of the claims are true.

Tags

NGSS.MS-PS2-2

A game of tug-of-war, in which two teams pull on opposite ends of a rope, is illustrated here. 
The center of the rope will move when which of the following is true? 

• The ground provides no friction for either team.
• One team has more people than the other. 
• The rope has essentially no mass of its own. 
• One team pulls with more force than the other.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2