Unit 3 Test-Force and Motion

What role did gravity play in how your bobsled moved down the ramp?

• Gravity caused the bobsled to slow down on the ramp.
• Gravity caused the bobsled to accelerate down the ramp.
• Gravity had no effect on the bobsled's movement.

Tags

NGSS.MS-ESS1-2

Students want to test if the amount of friction between an object and a wood floor changes if the floor is wet. Part A: How can they test this?

• Slide the same object on both a wet and a dry floor.

• Slide different objects on a wet floor.

• Slide different objects on a dry floor.

• Slide one object on a wet floor and a different object on a dry floor.

Tags

NGSS.MS-PS2-2

Part B: Which measurement will allow students to decide how water affects friction?

• The mass of the object

• The length of the floor

• How far the object moves

• The color of the floor

Which are the best ways to test how magnets pull on some objects at a distance? Choose TWO answers.

• Bring a magnet close to metal objects and see if they move.

• Bring a magnet close to plastic objects and see if they move.

• Touch a magnet to metal objects and see if they stick.

• Touch a magnet to plastic objects and see if they stick.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Look at the image of a toy car that is rolled down a ramp with two different surfaces. The images on the left show the car before it rolled down the ramp. The images on the right show the car after it rolled down the ramp. How far did the car move on the plastic ramp compared to the wood ramp?

• The car moved 4 times as far on the plastic ramp compared to the wood ramp.

• The car moved 40 cm on the plastic ramp and 20 cm on the wood ramp.

• The car moved 2 times as far on the wood ramp compared to the plastic ramp.

• The car moved 40 cm on the wood ramp and 20 cm on the plastic ramp.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

How can the motion on the two ramps be explained?

• The wood ramp generates a greater frictional force than the plastic ramp.

• The plastic ramp generates a greater frictional force than the wood ramp.

• The wood ramp generates a greater gravitational force than the plastic ramp.

• The plastic ramp generates a greater gravitational force than the wood ramp.

Tags

NGSS.MS-PS2-2

What force can students test using each of these methods? Read each description of a test. Place a letter in front of each test that shows the force it will test. Use G for gravity, F for friction, and M for magnetic. Push a tennis ball and a golf ball off the edge of your desk.

Groups:

(a) Gravity

,

(b) Magnetism

,

(c) Friction

• Pick up small and large paperclips with a magnet

• Drop an egg from different heights

• Pull a cardboard box and plastic box from one side of the room to the other

• Push a crate across the sidewalk and the grass

Tags

NGSS.MS-PS2-4

A springscale is used to pull a book across a flat surface. The force required measures 50 Newtons. What is one way to increase the amount of force needed to move the book?

• Pull the book down a ramp.

• Increase the mass of the book.

• Decrease (take away) the amount of friction on the flat surface.

• Decrease the mass of the book.

Tags

NGSS.3-PS2-3

Based on the data, place the magnets in order from weakest to strongest.

• X, Y, Z

• Y, Z, X

• X, Z, Y

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS2-5

What tools are needed to measure the time it takes for a ball to roll 50cm? Choose TWO correct answers.

• spring scale

• meter stick

• beaker

• stopwatch