Physical Science

A child with a mass of 40 kilograms exerts a force of 20 Newtons (N) on a brick wall that cannot move. What is the force exerted by the wall on the child?

• 0 N

• 20 N

• 60 N

• 80 N

Tags

NGSS.MS-PS2-1

A stationary object will always accelerate when

• an unbalanced force is applied

• two balanced forces are applied in opposite directions

• all forces are removed completely

• two opposing forces are increased by equal amounts

Tags

NGSS.MS-PS2-2

A red block and a blue block are placed on the same surface. A force of 10 newtons (N) applied to the red block causes it to accelerate to 10 meters per second (m/s). A force of 10 N applied to the blue block causes it to accelerate to 20 m/s. Which statement must be true?

• The mass of the blue block is 1/2 the mass of the red block

• The density of the blue block is greater than the density of the red block

• The volume of the blue block is greater than the volume of the red block

• The distance traveled by the blue block is 1/2 the distance traveled by the red block

Tags

NGSS.MS-PS2-2

Which will travel via a compression (longitudinal) wave?

• a radio wave

• a sound wave

• an infrared wave

• an ultraviolet wave

Through which of these will sound waves travel the fastest?

• oxygen gas

• solid iron

• liquid water

• outer space

Tags

NGSS.MS-PS4-2

One way astronomers can find nebulae is by searching for electromagnetic radiation with wavelengths that are longer than visible light. Which type of electromagnetic radiation has a wavelength that is longer than visible light?

• gamma rays

• infrared light

• ultraviolet light

• X-rays

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

Which is NOT a way that waves are organized in the electromagnetic spectrum?

• from lowest to highest energy

• from lowest to highest frequency

• from lowest to highest amplitude

• from lowest to highest wavelength

What is the BEST description of sound waves?

• A source vibrates up and down, causing air molecules to move up and down perpendicular to the direction the wave is transmitted

• A source vibrates back and forth, causing air molecules to move back and forth in the same direction that the wave is transmitted

• A source vibrates up and down and back and forth, causing air molecules to move in circular motion as the wave is transmitted

• A source ejects a ring of high-velocity air molecules that travel from the source to a listener

What is the amplitude and wavelength of the wave shown?

• Amplitude: 30 cm; wavelength: 60 cm

• Amplitude: 30 cm; wavelength: 110 cm

• Amplitude: 60 cm; wavelength 60 cm

• Amplitude: 60 cm; wavelength: 110 cm

Tags

NGSS.MS-PS4-1

Use the following information to answer the question.

A student conducted an investigation to study motion using a remote-controlled toy car. The graph shows the average speed of the toy car during the seven different sections of the investigation. All the forces acting on the toy car are balanced when the toy car is ________________________

• stopped

• speeding up

• going uphill

• slowing down

Tags

NGSS.MS-PS3-1