[H] Dynamics Review

In the absence of an external force a moving

object will...

• A slow down and come to a stop

• B speed up

• C move with a constant speed in a long a straight

  line

• D turn to the right

• E turn to the left

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NGSS.HS-PS2-2

A passenger standing in a moving bus, facing forward suddenly falls forward. This can be an indication which of the following?

• A The bus speeds up

• B The bus slows down

• C The bus doesn’t change its velocity

• D The bus turns to the right

• E The bus turns to the left

Tags

NGSS.HS-PS2-1

A heavy box sits on a floor. Which of the following about the net force on the box is true?

• A Non­zero vector pointing up

• B Non­zero vector pointing down

• C Non­zero vector pointing left

• D Non­zero vector pointing right

• E It is zero

Tags

NGSS.HS-PS2-1

A loaded truck collides with a car causing a huge damage to the car. Which of the following is true about the collision?

• A The force on the truck is greater than the force

• B

  The force on the car is greater than the force on

  the truck

• C

  The force on the truck is the same in magnitude

  as the force on the car

• D During the collision the truck makes greater

  displacement than the car

• E During the collision the truck has greater

  acceleration than the car

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

The Earth pulls down on a railroad wagon with a force of 200 kN. Which of the following is the “reaction force”?

• A The wagon pulls up the

  Earth with 200 kN

• B

  The wagon pushes down

  the railroad with 200 kN

• C The railroad pushes up the

  wagon with 200 kN

• D

  The buoyant force pushes up the wagon with

  200 kN

• E The wagon pushes down the Earth with 200 kN

Tags

NGSS.MS-PS2-1

A railroad wagon pushes down on a railroad with a force of 200 kN (or 200,000 N). Which of the following is the “reaction force”?

• A The wagon pulls up the Earth

  with 200 kN

• B

  The wagon pushes down the

  railroad with 200 kN

• C The railroad pushes up the wagon with 200 kN

• D

  The buoyant force pushes up the wagon with

  200 kN

• E The wagon pushes down the Earth with 200 kN

Tags

NGSS.MS-PS2-2

Which of the following is true about an astronaut’s weight on the surface of Moon compare to Earth?

• A Weight is the same, mass is less

• B Weight is less, mass is the same

• C Weight is less, mass is less

• D Weight is less, mass is greater

• E Weight is greater, mass is the same

Tags

NGSS.HS-PS2-4

An object is thrown straight up. How do we compare the net force on the object to its weight when it is on the highest point at the path?

• A It is greater than the weight

• B It is slightly less than the weight

• C It is zero

• D It is equal to the weight

• E It can’t be determine

Tags

NGSS.HS-PS2-1

In the diagram below, a block of mass m slides down an inclined plane with a constant speed at an angle θ with respect to the horizontal. What is the x­-component of the gravitational

force?

• A mg cosθ

• B mg sinθ

• C mg tanθ

• D mg

• E Zero

Tags

NGSS.HS-PS2-4

In the diagram below, a block of mass m slides down an inclined plane with a constant speed at an angle θ with respect to the horizontal. What is the ­y component of the gravitational force?

• A mg cosθ

• B mg sinθ

• C mg tanθ

• D mg

• E Zero

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4