Force and Motion Unit Test

Megan left her wagon outside while it was raining and it filled with water. When Megan tried to move the wagon that afternoon, she failed to budge the wagon. Why did Megan's wagon become hard to move?

• The rainwater increased the force of gravity pushing on the wagon, increasing the force it needed to move.

• The rainwater decreased the force of friction pulling on the wagon, decreasing the force it needed to move.

• The rainwater decreased the mass of the wagon, decreasing the amount of force it needed to move.

• The rainwater increased the mass of the wagon, increasing the amount of force it needed to move.

Tags

NGSS.MS-PS2-2

Students are measuring four boxes using spring scales. The diagram shows their investigation. Which box has the most mass?

• box W

• box X

• box Y

• box Z

Tags

NGSS.5-PS1-2

The frictional force on an object

• is always in the direction of motion of the object, speeding it up

• is in the direction opposing the motion of the object, slowing the object down.

Why are roads more slippery when they are wet?

• The water reduces the friction of the surface.

• The water increases the friction of the surface.

Kevin places a book on a desk. Why does the book stay still on the desk?

• According to Newton’s first law, an object at rest will stay at rest unless moved.

• There are no downward forces on the book.

• According to Newton’s second law, an object at rest will stay at rest unless moved.

• Newton’s third law says that it is too heavy to move.

According to Newton’s Second Law, F = ma

How does this equation relate to this law?

• It explains how gravity affects motion

• It explains how action and reaction forces work

• It explains how changing mass and acceleration can affect force

• It explains how motion and acceleration slow an object down

Tags

NGSS.MS-PS2-2

Two people who have the same weight sit on a seesaw at equal distances from the center. Neither uses any force to push against the ground. Which statement is true?

• The forces are unbalanced, so the seesaw will not move.

• The forces are balanced, so the seesaw will not move.

• The forces are unbalanced, so the seesaw will move.

• The forces are balanced, so the seesaw will move.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

A ball rolls down a grassy hill and eventually comes to a stop. Select three of the reasons the ball comes to a stop.

• The force of friction against the ball is decreased.

• The forces slowing the ball down are unbalanced forces.

• Gravity is acting on the ball, making it stop.

• Gravity is decreasing, which will stop the ball

• Friction is slowing the ball down.

Tags

NGSS.MS-PS2-2

A car is traveling 20 miles per hour, then changes direction at a fork in the road. The action that the car takes changes its

• Speed

• Direction and speed

• Gravity

• Direction

The graph shows the motion of a horse during the first portion of a race. Based on the information in the graph, which statement is true?

• The horse has negative acceleration

• The horse has constant positive velocity

• The horse has positive acceleration

• The horse is at rest

Tags

NGSS.MS-PS3-1