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PHY 111 CERTIFICATION EVALUATION 2026
SOLVED QUESTION COLLECTION
◉ A ball is attached to the center of the ceiling inside of a van moving at constant speed. If the ball is released, where will the ball land? Answer: Directly below its starting position (middle of the van) ◉ A student fires a bullet horizontally from a gun. Which statement is most accurate? Answer: The bullet will start to fall as soon as it leaves the gun. ◉ The grid below shows the path a student takes through a campus area. What is the approximate direction of the student's overall displacement? (Be careful—this is not a position vs. time graph.) Answer: 56° ◉ A student standing on the edge of a cliff throws a rock downward at a speed of 7.5 m/s at an angle 40° below the horizontal. It takes the rock 2.4 seconds to hit the ground. How tall is the cliff? Answer: 39.8 m
◉ A student rolls two balls off of a table. Ball A has twice the mass of ball B. Both balls leave the table at the same time with the same starting velocity. Which ball will hit the ground first? (Air resistance is negligible.) Answer: A will hit the ground at the same time as B. ◉ Vector A has components A = <-2, 5> m/s and vector B has components B = <6, - 2> m/s. What is the magnitude of vector C if C = A + B? Answer: 5 m/s ◉ A student throws a rock horizontally off a 5.0 m tall building. The rock's initial speed is 6.0 m/s. How long will it take the rock to reach the ground? Air resistance is negligible. Answer: 1.0 s ◉ A student fires a bullet horizontally out of a gun. At the same time the bullet leaves the gun, the student drops a second bullet from the same height. Which bullet hits the ground first? Answer: The two bullets will hit the ground at the same time. ◉ A student rolls two balls off of a table. Ball A has twice the mass of ball B. Both balls leave the table with the same starting velocity. Which ball will land further away from the table? (Air resistance is negligible.)
is 45° below the horizontal. The direction of the applied force on table C is 45° above the horizontal (see below). Which table will experience the smallest friction force? Answer: Table C will experience the smallest friction force. ◉ A negative acceleration indicates that an object might be Answer: moving forward while slowing down. ◉ An 800 kg car starts from rest and travels a distance of 75.0 m in 5.0 seconds. Which of the following is the correct net force acting on the car during this time? Answer: 4800 N ◉ Sphere A is initially at rest on the ground and is kicked so that it has an initial velocity of vo at an angle of θ. Sphere B is also initially at rest on the ground and kicked so that it has an initial velocity is 2vo at the same angle θ. Air resistance is negligible. The two spheres are identical. Consider both spheres at the moment when they have reached their respective maximum heights. Which of the following statements is accurate? Answer: The net force on sphere A is equal to the net force on sphere B. ◉ A student applies a steady 100 N force at an angle 45° below the horizontal to a 25 kg box. The maximum static friction force on the
box is 100 N. Which of the following is the Newton's third law reaction pair force to the 100 N force applied by the student? Answer: The force of the box on the student ◉ A student gives a 5.0 kg box a brief push causing the box to move with an initial speed of 8.0 m/s along a rough surface. The box experiences a friction force of 30 N as it slows to a stop. How long does it take the box to stop? Answer: 1.3 s ◉ A student places a 3.0 kg block on a frictionless ramp with an angle of incline of 35°. What is the acceleration of the block? Answer: 5.6 m/s ◉ The following force vector diagram shows all of the forces acting on a box. Which of the following correctly describes the motion of the box? Answer: None of the above describe the motion of the box. ◉ What angle is necessary to keep a 10 kg box motionless if the coefficient of static friction between the box and the ramp is 0.55? Answer: 28.8°
Answer: The force of the parachute on the student is equal to the force of the student on the parachute. ◉ A student applies a horizontal force of 100 N to a 25 kg box causing the block to accelerate at a rate of 1.5 m/s/s. Which of the following is the best approximation of the magnitude of the friction force on the box? Answer: 63 N ◉ A large truck moving at 30 mph collides with a parked car. How does the force of the truck on the car compare to the force of the car on the truck? Answer: The force of the truck on the car is equal to the force of the car on the truck. ◉ A system experiences an amount of work with a negative value. Which statement correctly interprets the significance of the negative sign? Answer: The system lost energy. ◉ A medium-sized air conditioning unit is rated at 900 W. How much energy will the AC unit require in order to operate for 2. hours? Answer: 6.48x106 J
◉ The applied force vs. distance stretched data for two different springs A and B is shown on the graph below. Which spring has the largest spring constant? Answer: Spring A has the largest spring constant. ◉ Which of the following is NOT considered a mechanical form of energy? Answer: Work ◉ A student connects a 300 kg container to a rope and pulley system and then connects the rope to a motor. If the student wants to lift the container 10.0 m in 2.0 min, what average power rating is required? Answer: 245 W ◉ A student sets a box at the top of a ramp with a steep angle of incline. The box will start from rest and will slide down the ramp and up a second ramp whose angle of incline is much less steep. Point P shows the position on the second ramp that is at the same height as the block's starting point in the first ramp. Which of the following statements is correct? Assume negligible friction losses. Answer: The box will just barely hit point P before it starts to slide back down the second ramp.
◉ A 500 kg rollercoaster car starts from rest at the top of a 10.0 m tall hill. It then travels down the track and up a loop. The top of the loop is 7.0 m from the ground. What is the speed of the rollercoaster car at the top of the loop assuming negligible friction losses? Answer: 7.7 m/s ◉ An elevator moves upwards while getting faster. Which of the following statements is correct? Answer: Work is converted into kinetic and gravitational energy. ◉ How much energy is stored in spring that has been compressed 0.20 m if the spring constant is 300 N/m? Answer: 6 J ◉ A student pushes a 0.2 kg box against a spring causing the spring to compress 0.15 m. When the spring is released, it will launch the box vertically into the air. What is the maximum height the box will reach if the spring constant is 300 N/m? Answer: 1.7 m ◉ Power is best defined as Answer: rate of energy transfer
◉ A car travels at a constant speed up a hill from point A to point B as shown in the diagram below. Which of the following statements is most correct? Answer: The gravitational energy increases, and the kinetic energy remains the same. ◉ A student connects a 1 hp motor to a bicycle. How much time will it take for the bicycle to accelerate from rest to a speed of 5.0 m/s if the combined mass of the student and the bicycle is 120 kg? (1 hp = 746 W) Answer: 2 sec ◉ What is the horsepower required for a 1200 kg car to travel from rest to a speed of 20 m/s in 7.0 seconds? (746 W = 1 hp) Answer: 46 hp ◉ Energy is best defined as Answer: the ability to make a system change in some way.
