Third Quarter Review AP1

A really strong stick figure drags a box of mass M across a rough floor (coefficient of kinetic Friction μ) with a force of magnitude F directed at an angle θ above the horizontal as shown. If he drags the box for a distance D, which of the following is equal to the work done by the force of friction?

Tags

NGSS.HS-PS2-1

A car of mass m is traveling at a speed of v when the driver applies the brakes. The car moves a distance of d before it stops completely. What is the magnitude of the braking force required?

Tags

NGSS.HS-PS2-1

A rocket of mass m begins to ascend vertically at v m/s. The work that gravity does on the rocket is:

• Negative

• Zero

• Positive

• Undefined

Tags

NGSS.HS-PS2-4

The graph shows the Force related to displacement of a lady pushing her daughter in a stroller. How much work was done by moving the buggy from 0-2m?

• 80J

• -100J

• 20J

• 40J

The graph shows the Force related to displacement of a lady pushing her daughter in a stroller. What is the TOTAL work done from 0-7m?

• 80J

• -100J

• -20J

• 20J

Tags

NGSS.HS-PS2-1

A person carries a mass of 10 kg and walks along the +x-axis for a distance of 100m with a constant velocity of 2 m/ s. What is the work done by this person?

• OJ

• 20J

• 200J

• None of the other choices is correct.

A boy throws a ball to another boy who throws it back with half the original speed. What is the ratio of the final kinetic energy to the initial kinetic energy of the ball?

• 0.25

• 0.50

• 2.00

• 0.75

Tags

NGSS.HS-PS3-1

Work is done ___________

• only when a force is applied

  to an object

  and causes the object to move

  in the opposite direction

  as the applied force.

• only when a force is applied

  to an object

  and causes the object to move

  in the same direction

  as the applied force.

Which of the following is true about the work done on an object by gravity?

• Gravity always does positive work on an object that moves downward.

• Gravity always does negative work on an object that moves downward.

• Gravity always does no work on an object that moves downward.

• Gravity sometimes does positive work on an object that moves down.

Tags

NGSS.HS-PS2-4

A red cart moves toward, and collides with, a stationary blue cart. After the collision, the carts stick together. Which graph could represent the velocity-vs-time graph for the center of mass of the system?

• 
• 
• 
• 

Tags

NGSS.HS-PS2-2