Forces (TEKS 6.7) Test

A book is sitting on a table. Which is the force that the table exerts on the book?

• gravity

• friction

• normal force

• applied force

A person is holding two magnets in their hands. Which cause-and-effect statement about magnetic force in the image is true?

• The magnets will repel each other because the same poles are together.

• The magnets will repel each other because opposite poles are together.

• The magnets will be attracted to each other because the same poles are together.

• The magnets will be attracted to each other because opposite poles are together.

Tags

NGSS.MS-PS2-3

A woman is redecorating her home and is pushing a large box out of the way to make room for other items. Each arrow in the image is a different type of force. Match the correct force with the correct letter.

• B

• Normal Force

• A

• Gravity

• D

• Applied Force

• C

• Friction

Tags

NGSS.MS-PS2-2

Friction is a force that we experience in our everyday lives. Analyze how the following systems are affected by changes to the initial conditions. Drag and drop the correct answer on each line to complete the sentences.

Friction always acts in the direction ​ (a)   to an object's motion. There are some ways to reduce or increase friction. For example, adding water to a playground slide will ​ (b)   the amount of friction. This will cause a person coming down the slide to move​ (c)   . Air resistance is another type of friction that is caused by motion through the air. A skydiver opens a parachute to ​ (d)   the friction, which will cause them to move ​ (e)  

• opposite
• decrease
• faster
• increase
• slower.

Tags

NGSS.MS-PS2-2

Susan is studying forces and is carrying out an experiment in which two different objects are dropped from the same height. The objects are a feather and a marble. She makes the following hypothesis: The force of gravity is the same on both objects, so they will fall to the ground with the same rate of acceleration. Is her hypothesis correct?

• Yes, because gravity acts equally on all objects regardless of their mass.

• No, because air resistance (friction) affects the feather more than the marble.

• Yes, because both objects are dropped from the same height.

• No, because the marble is heavier than the feather.

Tags

NGSS.MS-PS2-2

A student wants to analyze the factors that determine the change in motion of an object of a given mass. Which factors are needed to determine change in motion?

• strength of net force and the volume of the object

• strength of the force and direction in which it acts

• strength of pulling force and strength of pushing force

• surface area of the object and direction in which the force acts

Tags

NGSS.MS-PS2-2

Mark is completing an assignment on forces but is unsure about a few concepts. Especially, he needs help analyzing how differences in the strength of forces determine if those forces are balanced or unbalanced. Write the letter of ONE correct answer on each line to complete the sentences. Not all answers be used. Some responses may be used more than once or not at all. A 70 N box is sitting on a table. While at rest, the forces acting on the box are ​ (a)   . The normal force acting on the box is​ (b)   , ​ If someone applies a force to the box that is ​​ (c)   than the force of friction, the box will move. A box of twice the weight would need a ​ (d)   force to move it, and a box half its weight would need a ​ (e)   force to move it. If the box were pushed off the table, it would have unbalanced forces acting on it as it fell.

• balanced
• 70N
• greater
• 140N
• 35N
• smaller

Tags

NGSS.MS-PS2-2

Calculate the net force acting on the rope. What is the net force and its direction?

• 100 N to the left

• 900 N to the left

• 100 N to the right

• 900 N to the right

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Circle the explanation that best describes the net force and direction of the image.

• The forces were balanced: the net force is the sum of the two forces.

• The forces were unbalanced: the net force is the sum of the two forces.

• The forces were balanced: the net force is the difference of the two forces.

• The forces were unbalanced: the net force is the difference of the two forces.

Tags

NGSS.MS-PS2-2