Unit 2 Review -- AP Physics

Data has been collected about the net external force on an object as well as that object's acceleration while the net external force is exerted on it. What data should be graphed to create a linear graph, and what would be the meaning of the slope?

• Y-axis -- Net force; X-Axis -- Acceleration; Slope -- 1/mass

• Y-axis -- Acceleration; X-Axis -- Net Force²; Slope -- mass

• Y-axis -- Acceleration²; X-Axis -- Net Force; Slope -- mass

• Y-axis -- Acceleration; X-Axis -- Net Force; Slope -- 1/mass

• Y-axis -- Net Force²; X-Axis -- 1/Acceleration; Slope -- mass²

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NGSS.HS-PS2-1

A box of mass m is pushed for 10 seconds with a force P across a horizontal floor with negligible friction. After 10 seconds, the person stops pushing. Which velocity vs time graph below could represent this motion?

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NGSS.HS-PS2-1

A block of mass m is being slid at constant speed across a horizontal concrete floor by a force parallel to the floor. Which pair of quantities could be used to determine the coefficient of kinetic friction for the block on the concrete?

• Mass and speed of block

• Mass and normal force on the block

• Friction force and speed of the block

• Friction force and normal force on the block

• Normal force and speed of the block

If friction is negligible, when the system shown in the image is accelerated by an applied force of magnitude F the tension in the string between the blocks is:

• $F$
  

• $\frac{2}{3}F$

• $\frac{1}{2}F$

• $\frac{1}{3}F$

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NGSS.HS-PS2-1

Three blocks of mass m, 2m, and 3m sit next to each other on a horizontal surface where friction between the blocks and the surface can be neglected. A constant force of magnitude F is applied to the right. Which of the following statements is true?

• Each block will have a different acceleration depending on its mass. The acceleration of each can be calculated by the equation F = ma, so a = F/m.

• The acceleration of each block will be the same.

• The net force exerted on each block is identical and equal to F.

• The magnitude of the force on block 3m from 2m is greater than the magnitude of the force back on 2m from 3m.

• The net force exerted on 3m is three times greater than the net force exerted on m.

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NGSS.HS-PS2-1

Three boxes of equal mass are being pulled across a smooth tabletop. Box 2 is connected to Box 3 by a light cord that is pulled along with a force F as shown. Block 1 is accelerated at the same rate as Block 2 because of the friction forces between the two blocks. Friction between the blocks and the tabletop can be neglected. Which statement is true about the force diagram for block 1?

• There are 2 forces drawn on the force diagram.

• The frictional force is opposed by the force of block 2 on block 1.

• The force of block 2 on block 1 is opposed by the force of block 1 on block 2.

• The frictional force on block 1 is the same direction as F.

• There is an applied force to the right equal to F in the diagram.

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NGSS.HS-PS2-1

The cart of mass 10 kg shown in the image moves along a smooth surface on a horizontal table. A 10-newton force pulls the cart horizontally to the right. Which of the following describes a manner in which this cart could be moving? Select two answers.

• Moving left and speeding up.

• Moving left and slowing down.

• Moving right and speeding up.

• Moving right and slowing down.

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NGSS.HS-PS2-1

A student pulls a wooden box across a rough horizontal floor at a constant speed by means of angled force Fp as shown in the image. Which of the following must be true?

•  $F_p>F_f\ and\ F_N<F_g$  

•  $F_p>F_f\ and\ F_N=F_g$  

•  $F_p=F_f\ and\ F_N>F_g$  

•  $F_p=F_f\ and\ F_N=F_g$  

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NGSS.HS-PS2-1

A large crate is on the floor of a railroad car that is initially moving at a constant velocity to the right. Suddenly, the conductor applies the brakes, and the car begins to slow down. The crate does not slide with respect to the floor of the train car. Which of the diagrams below accurately represents the forces exerted on the crate during this time?

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NGSS.HS-PS2-1

True or false: The magnitude of a vector can never be less than the magnitude of any of its components.

• True

• False