CP: 2FF FEM Les. 4: Force & Motion

Which two surfaces would have the most friction between them?

• A boat and water

• A piece of paper and a tabletop

• A boulder and cement

• A sled and ice

Which answer best describes how mass affects the gravity between objects?

• The more mass objects have, the less gravity there is between them.

• The mass of an object changes when the object's gravity increases.

• The gravity between objects is not affected by the masses of the objects.

• Objects with more mass have more gravity between them.

Tags

NGSS.MS-PS2-4

The closer two objects are to each other --

• the more gravity there is between them.

• the less gravity there is between them.

• the more mass the objects have.

• the less mass the objects have.

As a ball rolls down a hill its speed increases. Once the ball reaches the bottom of the hill it rolls across a grassy field and it slows down until it stops.

Which two forces affected the ball's motion?

• Magnetism and density

• Gravity and friction

• Friction and magnetism

• None of the above

Tags

NGSS.MS-PS2-2

When planning an experiment involving testing force as it acts on an object, which of the following might be involved?

• Gravity

• Friction

• Energy

• All of the above

Tags

NGSS.MS-PS2-2

Which of the following objects would require the most force to bring into motion from a motionless state on a smooth lab table?

• A marble with a mass of 9.3 grams

• A jagged rock with a mass of 50 grams

• A plastic ping pong ball with a mass of 3.7 grams

• A wooden cube with a mass of 12 grams

Tags

NGSS.MS-PS2-2

A student performed an investigation in which she rolled a ball across different surfaces. She applied the same amount of force to the ball each time she rolled it. The results of her investigation are shown on the table above.

Which of the following is most likely the question the student based her investigation on?

• Do different balls roll the same distance?

• Do different surfaces change the mass of a ball?

• Do different masses affect distance rolled?

• Do different surfaces affect distance rolled?

Tags

NGSS.MS-PS2-2

Several students were working on a science investigation. They made a ramp using a book and a piece of wood. They placed the ramp on the tile floor of the classroom. Then they placed a toy car at the top of the ramp and let it roll down. They used a meter stick to measure the distance the toy car traveled across the floor. They repeated this investigation 3 times, adding a book to increase the height of the ramp each time. What is the variable in the investigation

• The height of the ramp

• The tile of the floor

• The distance traveled

• The type of meter stick used

Tags

NGSS.3-PS2-1

NGSS.3-PS2-2

Some students attach a balloon to a straw and then run a string through the straw, making a balloon rocket. They tape each end of the string to a different classroom wall so the string runs parallel to the floor. The students inflate the balloon and release the rocket.

Which should the students do to determine whether the force of the air from the balloon is enough to push the rocket 2 meters across the string in repeated trials?

• Test the rocket several times using different-sized balloons filled with different amounts of air

• Test the rocket several times using an identical balloon filled with different amounts of air

• Test the rocket several times using an identical balloon filled with the same amount of air

• Test the rocket several times using different-sized balloons filled with the same amount of air.

Tags

NGSS.MS-PS2-2

Match the following vocabulary terms

• A force that works against motion

• Friction

• A push or pull on an object

• Magnetism

• Repells or attracts magnetic objects

• Gravity

• Pulls objects toward one another

• Force

Tags

NGSS.MS-PS2-4