Work, Force, and Motions Unit 6 Review [PS.8ab]

Which demonstrates the concept of inertia?

• You are riding in a car and you have to brake quickly to stop. You fall forward against your seatbelt.

• You have to apply more force to pull a wagon with your friend in it than when it is empty.

• If a hockey player taps the puck, it glides over the ice, but if the player hits the puck with more force, it goes farther.

• The air in a balloon is released and the balloon is propelled upward and away.

What is the net force acting on the rope?

• 2 N left

• 2 N right

• 22 N right

• 22 N left

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

Which example shows work being done?

• You try for 10 minutes to push a stuck car out of the snow, but it only continues to spin its wheels.

• You help your mom lift the heavy groceries out of the car.

• You stand holding a heavy picture frame for your dad until he returns with a hammer.

• The mythical god Atlas holds the stationary Earth on his strong shoulders.

Two girls watched a squirrel run across the backyard, scurry around the base of a tree, climb up the tree, and come to a complete stop on a low branch. Their dog saw the same squirrel. It ran straight across the yard to chase it. Which observation is correct?

• The dog accelerated because it maintained a steady speed as it ran.

• The squirrel did not accelerate because it slowed down and stopped.

• The squirrel accelerated because it changed direction as it circled the tree.

• The dog did not accelerate because it moved in a straight line to chase the squirrel.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

You and three teammates go out for a run to prepare for an upcoming track meet. The total distance and time for each runner is recorded in the data table shown. Based on the data, put the runners in order from slowest average speed (1) to fastest average speed (4).

Groups:

(a) Slowest

,

(b) 2nd Slowest

,

(c) 2nd Fastest

,

(d) Fastest

• Runner B

• Runner A

• Runner D

• Runner C

Tags

NGSS.MS-PS3-1

Toyota reduces the mass of the RAV-4 vehicle by 325 kg. If the new design is otherwise identical to the original design, how will the new vehicle compare to the old one?

• The new design will accelerate slower.

• The new design will need less force to accelerate.

• The new design will need more force to accelerate.

• The two designs will require equal force to accelerate at the same speed.

Tags

NGSS.MS-PS2-2

Class A is playing tug of war against Class B. Class A is pulling with 60 N of force to the left. Class B is pulling with 45 N of force to the right. Which way is the rope moving and with what net force?

• 15 N to the left

• 15 N to the right

• 105 N to the left

• It is not moving.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

Which are examples of Newton’s 3rd Law of Motion?

• a person jumps on a trampoline higher and higher

• a rocket blasting off into space

• a bike stops and the rider flies over the handlebars

• a person paddles a canoe down a river

Tags

NGSS.MS-PS2-1

If you measured matter on Earth and the moon, which are correct? Place a checkmark (✓) on the lines beside the correct statements.

• Only weight would be less on the moon.

• Only mass is measured in kilograms.

• Mass would be the same on both the moon and Earth.

• Weight would be the same on both the moon and Earth.

• Both mass and weight would be less on the moon.

Tags

NGSS.MS-PS2-4

An engineer is designing a device to resist motion and stop an object when it comes into contact with a surface. What should the engineer research?

• Work

• Acceleration

• Friction

• Power