Review for Common Assessment/Forces and Change in Motion

     Which of the following statements BEST describes a gravitational force?

• a force that pulls objects toward each other

• a force that acts to both attract and repel each other

• a force that acts only when two objects are in contact with each other

Tags

NGSS.MS-PS2-4

When you kick a ball or throw a rock, it doesn’t fly through the air forever. Eventually, it returns to the ground. This is also because of force: the force of gravity. Gravity is the force that keeps everything on the surface of the Earth. Gravity keeps us from flying off into space. It pulls us toward the Earth.

Which of these is an effect of gravity?

• The brakes on a bike can make it stop.

• A cup placed on a table won’t float away.

• 
  Liquid water can become a gas.

       Which of the following statements BEST describes a “force”?

• A force is an event that changes the appearance of an object.

• A force changes an object into another object.

• A force is a push or pull that changes the motion of an object.

Tags

NGSS.MS-PS2-2

  Nilsa’s science teacher asks her what type of force can be used to lift a paper clip off the table without touching it. Which of the following forces should Nilsa choose to answer the teacher’s question correctly?

• Magnetic Force

• Elastic Force

• Air Resistance

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

    Which statement is TRUE about the Law of Gravity?

• Earth’s gravity extends only to the top of the atmosphere. 

• All objects exert the same gravitational force. 

• Only large objects exert a gravitational pull. 

      Humberto and La-Chaz are investigating magnetic forces in science class using two bar magnets.  What should they notice as they bring the north pole of one bar magnet next to the south pole of the other bar magnet?

• They form an electromagnet.

• They pull toward each other.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

  Shermain notices that when she rubs her hands together, they get warmer. Which force BEST explains what causes her hands to get warmer?

• An electrical force

• A frictional force

• A gravitational force

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

     Which action is the BEST example of a force that operates at a distance?

• a baseball bat striking a ball

•  a baseball falling back to the ground

• a baseball player catching a ball in his glove

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-5

    Alexandria notices that her skateboard is harder to push on the sidewalk than usual. She notices that when she spins the wheels they quickly come to a stop. She can also see rust and dirt all over them.

Based on her observation, which is the most likely cause of her skateboard being harder to push.

• A decrease in the electrical force

• A decrease in the gravitational force

• An increase in the frictional force

Tags

NGSS.MS-PS2-2

     Susan and Monali are conducting a science experiment in their science class. They have set up three ramps of equal height. On a level surface at the bottom of each ramp they have placed three different materials the ball will need to roll across.  The first surface is a smooth piece of cardboard. The second is a piece of sandpaper. The third piece of material is a piece of carpet.             

Which of the following forces can the experiment test?

• An electrical force

• A gravitational force

• A magnetic force

• A frictional force

Tags

NGSS.MS-PS2-2