Podcast
Questions and Answers
What is the definition of average velocity?
What is the definition of average velocity?
- distance traveled divided by the time
- radius multiplied by angular velocity
- average acceleration multiplied by the time
- displacement divided by the time (correct)
A student standing on a bathroom scale in an elevator reads 520 N. What is the elevator doing?
A student standing on a bathroom scale in an elevator reads 520 N. What is the elevator doing?
- moving downward at a constant speed
- at rest
- accelerating upward (correct)
- moving upward at a constant speed
An object is moving east at a constant speed. A force is applied to the north. What is the resulting path of the object?
An object is moving east at a constant speed. A force is applied to the north. What is the resulting path of the object?
- a straight line path totally to the north
- a straight line path partly eastward, partly northward (correct)
- a parabolic path opening toward the north
- an exponential path opening upward toward the north
Which object returns to the starting height with the greatest speed?
Which object returns to the starting height with the greatest speed?
Which object experiences the greatest change in linear momentum?
Which object experiences the greatest change in linear momentum?
What is the purpose of the bathroom scale in the elevator?
What is the purpose of the bathroom scale in the elevator?
What is the direction of the force applied to the object in question 3?
What is the direction of the force applied to the object in question 3?
Why are the objects launched at different angles?
Why are the objects launched at different angles?
What is the most correct recorded value for the location of the shaded object's right end on a standard centimeter ruler?
What is the most correct recorded value for the location of the shaded object's right end on a standard centimeter ruler?
What is the average thickness of a page of a physics textbook in micrometers?
What is the average thickness of a page of a physics textbook in micrometers?
How many hours will it take for two automobiles to meet if they are 150 kilometers apart and traveling towards each other at 60 km/h and 40 km/h?
How many hours will it take for two automobiles to meet if they are 150 kilometers apart and traveling towards each other at 60 km/h and 40 km/h?
What can be said about the velocity of a particle when its acceleration is positive and increasing?
What can be said about the velocity of a particle when its acceleration is positive and increasing?
What would be a reasonable equation for the acceleration of an object moving with a position-time graph like the one shown?
What would be a reasonable equation for the acceleration of an object moving with a position-time graph like the one shown?
What is the minimum average net force necessary to stop a 500-kg car moving at 28 m/s in 95 meters?
What is the minimum average net force necessary to stop a 500-kg car moving at 28 m/s in 95 meters?
What can be said about the motion of a pendulum ignoring friction in the system?
What can be said about the motion of a pendulum ignoring friction in the system?
What is the relationship between the velocity and acceleration of an object?
What is the relationship between the velocity and acceleration of an object?
What is true about the total mechanical energy in the pendulum-Earth system?
What is true about the total mechanical energy in the pendulum-Earth system?
What is the result of dividing the distance of 12 Mm by the time of 4 Ts?
What is the result of dividing the distance of 12 Mm by the time of 4 Ts?
What happens to the magnitudes of the normal force and the static frictional force of the incline on the block as φ is slowly increased?
What happens to the magnitudes of the normal force and the static frictional force of the incline on the block as φ is slowly increased?
Which of the fundamental forces do contact forces represent?
Which of the fundamental forces do contact forces represent?
What is the relationship between the initial velocity of the cart and the distance it travels before coming to rest?
What is the relationship between the initial velocity of the cart and the distance it travels before coming to rest?
What is the kinetic energy at E compared to the kinetic energy at C?
What is the kinetic energy at E compared to the kinetic energy at C?
What is the effect of increasing the angle of the incline on the block's motion?
What is the effect of increasing the angle of the incline on the block's motion?
What is the main force responsible for the cart's motion along the track?
What is the main force responsible for the cart's motion along the track?
What can be inferred about the change in momentum of two objects undergoing different motions?
What can be inferred about the change in momentum of two objects undergoing different motions?
When does the toy car have zero acceleration according to the velocity versus time curve?
When does the toy car have zero acceleration according to the velocity versus time curve?
In which situation is the net force constantly zero on the object?
In which situation is the net force constantly zero on the object?
What net force is necessary to keep a 1.0 kg puck moving in a circle of radius 0.5 m on a horizontal frictionless surface with a speed of 2.0 m/s?
What net force is necessary to keep a 1.0 kg puck moving in a circle of radius 0.5 m on a horizontal frictionless surface with a speed of 2.0 m/s?
What happens to the center of mass of the block and wedge system as the block slides down the inclined surface of the wedge?
What happens to the center of mass of the block and wedge system as the block slides down the inclined surface of the wedge?
What is the net force on the box if Ted exerts a force T to the right and Mario exerts a force M to the left, which is half as large as the force T?
What is the net force on the box if Ted exerts a force T to the right and Mario exerts a force M to the left, which is half as large as the force T?
What is the acceleration of the block as it slides down the inclined surface of the wedge?
What is the acceleration of the block as it slides down the inclined surface of the wedge?
What is the net force on the skydiver who has reached terminal velocity?
What is the net force on the skydiver who has reached terminal velocity?
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Study Notes
Physics Questions
- Division I students should start from the beginning, while Division II students should skip the first 10 questions and start from question 11.
Ruler Measurement
- When measuring the location of a shaded object's right end on a standard centimeter ruler, the most correct recorded value is 10.0 cm.
Thickness of a Physics Textbook Page
- The average thickness of a physics textbook page is 100 micrometers.
Meeting Time of Two Automobiles
- If two automobiles are 150 kilometers apart and moving towards each other, one at 60 km/h and the other at 40 km/h, they will meet in 2 hours.
Particle Acceleration
- If a particle's acceleration is positive and increasing, it must be speeding up.
Position-Time Graph
- A position-time graph with a parabolic curve indicates an object's acceleration is constant.
Force to Stop a Car
- To stop a 500-kg car moving at 28 m/s in 95 meters, a minimum average net force of 2060 N is necessary.
Pendulum Energy
- In a pendulum-Earth system, the total mechanical energy is constant, and the potential energies at the highest and lowest points are equal.
Distance and Time
- Dividing a distance of 12 Mm by a time of 4 Ts gives a speed of 3 km/s.
Block on an Incline
- As the angle of an incline increases, the normal force and static frictional force on a block also increase.
Contact Forces
- Contact forces are examples of electromagnetic forces.
Cart Motion
- A cart coming to rest after traveling 1 m from an initial speed of 0.5 m/s will travel 4 m before coming to rest if the initial speed is 1 m/s.
Average Velocity
- Average velocity is defined as displacement divided by the time.
Elevator and Scale
- If a scale in an elevator reads 520 N when a student weighing 500 N stands on it, the elevator is accelerating upward.
Object Path
- If a constant force is applied to an object moving with constant speed in the East, the object will follow a parabolic path opening towards the North.
Launched Objects
- Two identical objects launched with the same speed at different angles will return to the starting height with the same speed, but Object 2 will be in the air for a longer time and experience a greater change in linear momentum.
Velocity vs. Time Curve
- A toy car has zero acceleration when its velocity-time curve is horizontal.
Net Force
- A net force of zero is necessary to keep a puck moving in a circle on a frictionless surface with a constant speed.
Wedge and Block
- The center of mass of a block and wedge system will move horizontally with constant speed when the block slides down the inclined surface of the wedge.
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