PHYSICS TEST

III only

7. Three objects can only move along a straight, level path. The graphs below show the position x of each of the objects plotted as a function of time t. The net force on the object is zero in which of the cases?https://lh6.googleusercontent.com/wb20yKxZ2oV25faN58OEQz-V9kDMpqLndNMZ7OlpKOqy_yslxtDk4pKMuvrv4Gpg36uCEEOxtg=w210

6. An elevator car weighs 5500 N. If the car accelerates upwards at a rate of 4.0 m/s/s, what is the tension in the support cable lifting the car? Use g = 10 m/s/s

7700 N

10. The below graph shows velocity as a function of time for an object moving in a straight line. Which of the following graphs correctly shows acceleration as a function of time for the same object during the same time interval? https://lh6.googleusercontent.com/2cGAbdvKQ67aVg-guH1UEA5-CPbxNIWDjfJVcKoF87B2tz6_JIkC73KYDJuO42ny-wdkF5QUsw=w514

D

2. Each of the figures shows a tractor attached to an object. The tractor exerts the same constant force F on each object in every case. Which of the following is a true statement about an object and the relative magnitude of the force exerted by the object on the tractor? https://lh5.googleusercontent.com/SwKX-CItSuedrEAn0aB3xr53zlMwE6OHjG2t_RKG4sRLGF8_NELRr4vrRuM_R17BpYCag4vbZw=w302

The magnitude of the force exerted by each object on the tractor is equal, because the tractor exerts an equal force on each object.

2. An object's velocity v as a function of time t is given in the graph. Which of the following statements is true about the motion of the object? https://lh5.googleusercontent.com/BYlAxJXIsm15DD8fXEiWBDhg0g71S2L_87c05IKbyN_mELN4XTDNYPccoXhF9etmMNsi4dAHyg=w301

The object's initial and final positions are the same.

A student sets an object attached to a spring into oscillatory motion and uses a position sensor to record the displacement of the object from equilibrium as a function of time. A portion of the recorded data is shown in the figure. 6. The speed of the object at time t = 0.65 s is most nearly equal to which of the following? https://lh4.googleusercontent.com/wdqoPspUZSt_JInhY9MKBq3PpeDuiXmFWc82bfZwHduVp8tH7yampPvGueCM1Dmae0pzBZuA8Q=w442

The slope of the best-fit curve at 0.65 s

4. A heavy box sits on a floor. The net force on the box can be represented as which of the following?

it is zero

A student sets an object attached to a spring into oscillatory motion and uses a position sensor to record the displacement of the object from equilibrium as a function of time. A portion of the recorded data is shown in the figure. 7.The total distance traveled by the object between 0.35 s and 0.40 s is most nearly https://lh4.googleusercontent.com/wdqoPspUZSt_JInhY9MKBq3PpeDuiXmFWc82bfZwHduVp8tH7yampPvGueCM1Dmae0pzBZuA8Q=w442

2 cm

9. While coming to a stop, a car's velocity decreases at a constant rate of 2 m/s every second. It travels 25 m during this time. Which of the following is the magnitude of the velocity just before it began to slow down?

10m/s

10. The force vs. acceleration graph, shown below, plots the force acting on an object and corresponding acceleration of the object. Given this data, what is the mass of the object? https://lh5.googleusercontent.com/TQ4YgA-dBkb3KenzZu1LPidVxe13uYpUpRzqr9dySBg3Lub9XOTGfLlz1JH53jfbT-eJo2qcYA=w589

12 kg

4. A car moving in the positive direction (from left to right in the diagram below) is leaking oil that drops on the ground once every second. The diagram below represents the oil drops on the road at various points in the car's journey. Which of the following statements correctly describe the motion of the car during its trip from point A to point F? Select two answers. https://lh4.googleusercontent.com/Tpy_T5xFMVUO2RESwm4395xX2kdA9cPNR1E4Is4H0lkVMU8golxVIN0egdL7smRTAVxOvlzbMg=w450

Between points D and E, the car has a negative acceleration. (RIGHT) Between points E and F, the car is going slower than its instantaneous speed at point C.

9. An elevator carrying a person of mass m is moving upward and slowing down. How does the magnitude F of the force exerted on the person by the elevator floor compare with the magnitude mg of the gravitational force?

F > mg

8. The graph shows velocity v as a function of time t for a 0.50 kg object traveling along a straight line. The graph has three segments labeled 1, 2, and 3. A rope exerts a constant force of magnitude FT on the object along its direction of motion the whole time. During segment 2 only, a frictional force of magnitude Ff is also exerted on the object. Which of the following expressions correctly relates the magnitudes Ff and FT ? https://lh4.googleusercontent.com/AqYURET90lq5tG9DOjmjtMa-x3-xaLZEnLIFUO_1Xx98tL_XeDNEvqbhNuq_JclDbLSRZu3eiQ=w248

Ff > FT

3. Position as a function of time of two moving objects is presented by the graph. Which of the following statements is true? Select two answers. https://lh4.googleusercontent.com/i6HEd2D66YS6LlGVfrNO1U9EEHd5iBvQonaataXX2dZ74jNCfqOePsnQAkoQQL46O6-Q6veIzg=w269

Object II has a greater velocity that object I At time t0 object II passes by object I

5. The graph below shows velocity as a function of time for an object moving along a straight line. Which of the following best describes the motion of the object from 2 to 3 seconds?https://lh4.googleusercontent.com/eGI_-wCopf71m9swWswBZ7kqbDXm52OrrLwV4vFzr_zjYcLk0-SVx_4FWAtAp5CDwwXjS1y7pQ=w476

Speeding up while moving in the negative direction

3. A person is running on a track. Which of the following forces propels the runner forward?

The force of friction exerted by the ground on the person

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

The force on the truck is the same in magnitude as the force on the car

1. Two objects, A and B, move toward one another. Object A has twice the mass and half the speed of object B. Which of the following describes the forces the objects exert on each other when they collide and provides the best explanation?

The forces exerted by each object on the other are the same, because interacting objects cannot exert forces of different magnitude on each other. (NEED ANSWER)

Can an object's average velocity equal zero when object's speed is greater than zero?

Yes, when the object returns to its original position

A cart is constrained to move along a straight line. A varying net force along the direction of motion is exerted on the cart. The cart's velocity v as a function of time t is shown in the graph. The five labeled points divide the graph into four sections. Which of the following correctly ranks the magnitude of the average acceleration of the cart during the four sections of the graph? https://lh3.googleusercontent.com/4joJ4YI4KZZnaf6QJoVz3yocfzPSlWrA_mYZlLhH8noYNlRGlWriKmxJ60TtazAqcfZjmzCrnQ=w323

aCD > aAB > aDE > aBC