Big Idea 13 Forces and Changes in Motion

A force is a push or pull. Examples of forces include pushing to open a door, pushing a book across a desk, or pulling a wagon. What would take a greater force to move?

• a book

• a pencil

• a teacher's desk

• a cup of water

Tags

NGSS.3-PS2-1

A toy car rolling along different surfaces will experience different amounts of friction. The toy car would encounter the most friction when rolling on which of the following surfaces?

• a piece of carpet

• a sheet of glass

• a smooth wooden board

• a piece of construction paper

Phil is standing in front of a chair. The chair is standing on the floor. Phil applies a force to the chair, and it moves on the floor toward him. What kind of force did Phil apply?

• lift

• gravity

• pull

• push

Tags

NGSS.3-PS2-1

NGSS.3-PS2-2

Janiyah is pulling a rope to the left. Cyn'terrea is pulling the rope to the right. The rope stays in the same position. Which of these best explains why the rope does not move?

• the two forces are acting in the same direction.

• the two forces are equal and balance each other out

• two forces cannot act on one object at the same time

• the force to the left is greater than the force to the right.

Tags

NGSS.MS-PS2-2

Position refers to the location of an object.

• true

• false

Jose is a mechanic at an automobile repair shop. He spilled a can of oil on the concrete floor. The spilled oil will reduce which force?

• friction

• gravity

• centripetal

• magnetism

An object moving along a surface suddenly increases speed. What can cause this to happen?

• it is moved by balanced forces.

• it is moved by two opposite forces.

• it is moved by an unbalanced force.

• it moves on its own.

Tags

NGSS.MS-PS2-2

1. Which statement best describes what must happen in order for a person to lift an object?

• a. The force of gravity must be greater than the mass of the object.

• b. The mass of the object must be greater than the force of gravity.

• c. The force of gravity must be greater than the upward pull or push on the object.

• d. The upward pull or push on the object must be greater than the force of gravity

Tags

NGSS.HS-PS2-1

1. A student wants to arrange two bar magnets so that they repel each other. Which arrangement shows the best arrangement for the magnets to repel each other?

• 
• 
• 
• 

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

A student places one magnet above another magnet, as shown below.

Why does the top magnet appear to float above the bottom magnet?

• a. The magnets are made of different material.

• a. The like poles (N and N, S and S) of the magnets repel each other.

• The opposite poles (N and S) of the magnets repel each other

• The magnets have a different gravitational attraction

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5