Otto pushed a toy car across a floor. The car traveled fast across the wood, but it slowed to a stop on the carpet. Which best explains what happened when the car reached the carpet?

• inertia decreased

• gravity increased

• friction increased

• magnetism decreased

Tags

NGSS.3-PS2-1

Which material should be used on a bicycle ramp to increase friction?

• shiny metal

• rough paper

• smooth wood

• wet plastic

Tags

NGSS.MS-ETS1-2

Student set up the investigation show. What can the students do to increase the speed that the marble will roll down the ramp?

• add a layer of carpet board

• lower the height of the board

• use a longer board for the ramp

• replace the board with a smoother board

Tags

NGSS.MS-PS2-2

This drawing shows four balls with different masses.

One has a mass of 45 grams. Two has 5,000 grams. Three has 145 grams and 4 has 59 grams.

A student pushes each ball with the same amount of force on the same surface. Enter the number of the ball that will roll the shortest distance.

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS2-2

A group of students are investigating motion using a toy car, a ramp, and a milk carton at the end of the ramp.

At which height should car be put on the ramp to push the milk carton the farthest?

• 35 cm

• 25 cm

• 15 cm

• 10 cm

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS3-2

The pull of gravity on Earth is caused by

• air pressure

• the mass of Earth

• volcanoes erupting

• Earth's orbit around the Sun

Tags

NGSS.MS-PS2-4

Which is needed to determine the amount of gravitational force between two objects?

• weight and time

• distance and mass

• volume and mass

• area and weight

Tags

NGSS.MS-PS2-4

Jan has two identical magnets on her metal cabinet. She hangs a drawing using Magnet 1. She tries to hang a calendar using magnet 2, but the calendar falls to the floor.

Which best explains why Magnet 1 can hold up the drawing but Magnet 2 is unable to hold the calendar?

• the area near Magnet 1 has extra metal

• the calendar is longer than the drawing

• the area under magnet 2 has more gravitty

• the calendar has a greater mass than the drawing

Tags

NGSS.MS-PS2-4

Two people are pushing on opposite sides of a box with equal force.

Which statement best describes what will happen?

• the box will not move

• the box will move toward student 1

• the box will move toward student 2`

• the box will slowly turn in place.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

What can cause objects to be attracted to each other

• Both objects that are positively charged (+ -> <- +)

• Objects that are opposites

  (+ -> <- -)

Answer explanation

Opposites attract.

Like objects repel.

Tags

NGSS.MS-PS2-3