Work Force and Motion

The wings of a bird push the air downwards, creating an upward force that helps them move forward. This is an example of every action having an equal and opposite reaction. Which of Newton's Laws of Motion does this represent?

• First

• Second

• Third

• First and Third

Tags

NGSS.MS-PS2-1

Power = Work/Time

To complete a project, 400,000 Joules of work are needed. The time taken to complete the project is 100 seconds. How much power is needed?

• 40,000,000 J/s

• 4,000 J/s

• 0.00025 J/s

• 400 J/s

You must select all correct answers.

Which simple machine does the following to make work easier for people?

1. 1. Changes the direction of a force that is exerted

2. 2. Reduces the amount of input forced needed to move an object

• Wedge

• Pulley

• Lever

• Wheel & Axle

You MUST SELECT all of the correct answers.

The Science Club is experimenting to see how the amount of force applied to a soccer ball affects how far the soccer ball travels. What parts of the experiment must the club keep the same for every trial?

• The soccer ball

• The person kicking the ball

• The length that the soccer ball travels

• The amount of force the kicker uses

Tags

NGSS.MS-PS2-2

A mover is pushing a box to the right and applying 25 N of force. The frictional force resists the object's movement.

What direction is the frictional force being applied?

• Upwards

• To the right

• Downwards

• To the left

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

• 46.2 m

• 312 m

• 240 m

• 0.022 m

Which statements are true about the motion of the wheelchair?

You must choose all of the correct answers.

• The greater the mass in the wheelchair, the more force that must be applied to move it

• When the nurse moves the wheelchair, the force of friction is applied in the same direction as the wheelchair moves

• A larger force applied by the nurse to move the wheelchair will result in a greater change in the motion

• If the nurse wants the wheelchair to move, the net forces applied must not be zero.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

The southern flying squirrel is one of three species of flying squirrels found in North America.

A scientist is investigating to see if the launch height of the southern flying squirrel affects the distance it can glide.

What is the independent variable in this experiment?

• The length of the squirrel

• The glide distance travelled

• The launch height of the squirrel

• The mass of the squirrel

Tags

NGSS.MS-PS2-2

The graph shows the temperature at different times during the day.

Which statement is true?

• As time increases, the temperature increases

• As time increases, the temperature decreases

• As time increases, the temperature stays the same

• As time increases the temperature increases and then decreases

Tags

NGSS.MS-PS1-4

Look at the picture. T = time and V = velocity

At which position is the ball traveling the fastest?

• A

• B

• C

• D

Tags

NGSS.MS-PS3-1