Question 1

Refer to the first image. Three vectors are shown: $$\vec{A} (33 $$units along $$+x$$), $$\vec{B} (22 $$units along $$+y$$), and $$\vec{C} (60 $$units at $$30^\circ$$ below the $$-x$$ axis). What is the magnitude of the resultant vector $$\vec{A} + \vec{B} + \vec{C}$$?

Accepted Answer

$$45$$ units

Question 2

In the second image, a projectile is launched from a $$20\,\mathrm{m}$$ high cliff at $$30^\circ$$ above the horizontal. Neglecting air resistance, which of the following best describes the vertical velocity of the projectile at point Q (just before it hits the ground)?

Accepted Answer

It is greater in magnitude than the initial vertical velocity.

Question 3

Refer to the third image (velocity-time graph for a car and a truck). At time $$T$$, which vehicle has traveled a greater distance since $$t=0$$?

Accepted Answer

The truck

Question 4

Refer to the fourth image (position vs. time graph). What is the total distance traveled by the object between $$t=0$$ and $$t=9 s$$?

Accepted Answer

$$5.0\,\mathrm{m}$$

Question 5

Refer to the fifth image (velocity vs. time graph). What is the acceleration of the particle?

Accepted Answer

$$0.78\,\mathrm{m/s^2$}$$

Question 6

Refer to the sixth image (two boxes A and B connected by a string S, pulled by force P). According to Newton's third law, what is the reaction force to the pull P?

Accepted Answer

The pull of box B on the wire

Question 7

Refer to the seventh image (block A on a table connected by a pulley to block B hanging off the edge). If block B is released from rest, which of the following is true about the acceleration of the system (neglecting friction and mass of the pulley)?

Accepted Answer

$$a = \dfrac{m_B g}{m_A + m_B}$$

Question 8

Refer to the eighth image (two weights, 25 N and 100 N, connected by a string and pulled upward with force P). If the system moves upward at constant speed, what is the tension T in the string?

Accepted Answer

$$25\,\mathrm{N}$$

Question 9

Refer to the ninth image (two masses $$M \u003e m$$ connected over a pulley). Which free-body diagram correctly represents the forces acting on the two objects?

Accepted Answer

The diagram with upward tension and downward weight on both masses

Question 10

Refer to the tenth image (three blocks connected by strings, being pulled to the right). If $$T_1 is $$the tension between the 10 N and 20 N blocks, and $$T_2 is $$the tension between the 20 N and 100 N blocks, which of the following is true?

Accepted Answer

$$T_1$$ \u003e $$T_2$$

Question 11

Refer to the eleventh image (15 kg block on a 20° ramp connected to a 19 kg hanging block). What is the acceleration of the 19 kg block after the system is released?

Accepted Answer

$$4.0\,\mathrm{m/s^2$}$$

Question 12

Refer to the twelfth image (acceleration vs. force graph for three objects). If object 2 has a mass of $$36\,\mathrm{kg}$$, what is the mass of object 1?

Accepted Answer

$$14\,\mathrm{kg}$$

Question 13

Refer to the thirteenth image (object held by two wires at $$30^\circ to $$the vertical, with downward forces $$w$$ and $$F). If$$ $$w = 60\,\mathrm{N}$$ and $$F = 410\,\mathrm{N}$$, what is the tension $$T in $$each wire?

Accepted Answer

$$271\,\mathrm{N}$$

Question 14

Refer to the fourteenth image (Alice and John race across a river, Alice goes straight across and back, John goes upstream and back). If the river is $$960\,\mathrm{m}$$ wide, the current is $$16\,\mathrm{m/s}$$, and the boat speed in still water is $$20\,\mathrm{m/s}$$, who returns first?

Accepted Answer

Alice

Question 15

Refer to the fifteenth image (10 N and 30 N blocks connected over a pulley). What is true about the tension $$T in $$the string?

Accepted Answer

$$T \u003c 30\,\mathrm{N}$$

Question 16

Refer to the sixteenth image (three blocks, 12 kg, 18 kg, and unknown, with $$a = 2.5\,\mathrm{m/s^2$}$$ and tension between B and C is $$60\,\mathrm{N}). $$What is the mass of block C?

Accepted Answer

$$4.9\,\mathrm{kg}$$

Question 17

Refer to the seventeenth image (blocks $$m_1$$ and $$m_2$$ connected over a pulley). If $$m_2$$ \u003e $$m_1$$, what is true about the tension $$T in $$the string just after release?

Accepted Answer

$$T \u003c m_2$ g$$

Question 18

Refer to the eighteenth image (fish hanging from two spring scales). If the fish weighs $$16\,\mathrm{N}$$, what does each scale read?

Accepted Answer

$$16\,\mathrm{N}$$

Question 19

Refer to the nineteenth image (blocks on a frictionless incline and pulley). If the 9.0 kg block accelerates downward, what is the tension in the wire connecting the two blocks on the incline?

Accepted Answer

$$42\,\mathrm{N}$$

Question 20

Refer to the twentieth image (block A on top of block B, 100 N pull to the right). Which free-body diagram correctly represents the horizontal forces acting on block B?

Accepted Answer

The diagram with a single 100 N force to the right

Physics I Exam Study Guidance: Vectors, Kinematics, Projectile Motion, and Forces

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