Physics Measurement and Problem Solving

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Questions and Answers

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?

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?

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?

The speeds are the same Signup and view all the answers

Which object experiences the greatest change in linear momentum?

Both objects experience the same change in linear momentum Signup and view all the answers

What is the purpose of the bathroom scale in the elevator?

to measure the student's weight Signup and view all the answers

What is the direction of the force applied to the object in question 3?

North Signup and view all the answers

Why are the objects launched at different angles?

to compare their speeds at the same height Signup and view all the answers

What is the most correct recorded value for the location of the shaded object's right end on a standard centimeter ruler?

10.00 cm Signup and view all the answers

What is the average thickness of a page of a physics textbook in micrometers?

10 Signup and view all the answers

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?

1.75 Signup and view all the answers

What can be said about the velocity of a particle when its acceleration is positive and increasing?

It must be speeding up Signup and view all the answers

What would be a reasonable equation for the acceleration of an object moving with a position-time graph like the one shown?

a=0 Signup and view all the answers

What is the minimum average net force necessary to stop a 500-kg car moving at 28 m/s in 95 meters?

2060 N Signup and view all the answers

What can be said about the motion of a pendulum ignoring friction in the system?

It will oscillate back and forth Signup and view all the answers

What is the relationship between the velocity and acceleration of an object?

When acceleration is positive, velocity is increasing Signup and view all the answers

What is true about the total mechanical energy in the pendulum-Earth system?

It is constant. Signup and view all the answers

What is the result of dividing the distance of 12 Mm by the time of 4 Ts?

3 km/s Signup and view all the answers

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?

Both increase. Signup and view all the answers

Which of the fundamental forces do contact forces represent?

Electromagnetic force. Signup and view all the answers

What is the relationship between the initial velocity of the cart and the distance it travels before coming to rest?

The distance traveled is directly proportional to the initial velocity. Signup and view all the answers

What is the kinetic energy at E compared to the kinetic energy at C?

It is equal to the kinetic energy at C. Signup and view all the answers

What is the effect of increasing the angle of the incline on the block's motion?

The block will remain at rest. Signup and view all the answers

What is the main force responsible for the cart's motion along the track?

Frictional force. Signup and view all the answers

What can be inferred about the change in momentum of two objects undergoing different motions?

The change in momentum is the same for each Signup and view all the answers

When does the toy car have zero acceleration according to the velocity versus time curve?

at approximately 3.0 seconds Signup and view all the answers

In which situation is the net force constantly zero on the object?

An astronaut floating in the International Space Station Signup and view all the answers

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?

4.0 N Signup and view all the answers

What happens to the center of mass of the block and wedge system as the block slides down the inclined surface of the wedge?

it moves horizontally with constant speed Signup and view all the answers

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?

T/2 to the right Signup and view all the answers

What is the acceleration of the block as it slides down the inclined surface of the wedge?

accelerating down the wedge Signup and view all the answers

What is the net force on the skydiver who has reached terminal velocity?

zero Signup and view all the answers

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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Description

Quiz covering basic physics concepts, including measurement and problem-solving questions.