Physics: Forces and Energy

If an object is stationary (not moving), its kinetic energy is:

Which energy transformation takes place in a battery-operated toy car that is moving?

What happens to the gravitational potential energy of an elevator as it rises from the ground floor to the 10th floor?

Which of the following objects has the most kinetic energy?

A battery-powered toy car travels up a ramp at a constant speed. The diagram below represents the flow of energy through the different components of the car. Which sequence correctly identifies the primary energy transformations occurring from the power source until the car reaches the top of the ramp?

A pendulum is swinging. At the lowest point of its swing, which statement is true about its energy?

When a match is struck and ignites, which transformation is most prominent?

An object with a mass of $10\text{ kg}$ is accelerated from rest to $5\text{ m/s}$ in $2\text{ seconds}$. What is the average power required to achieve this acceleration?

A ball is released from rest at point A and rolls down a track to point B. If the vertical distance between A and B is $h$, what is the velocity at point B? (Ignore friction and $g$ is gravity)

Which of the following energy resources is technically non-renewable on a human timescale?

If an object is moved to a planet where the gravity is twice as strong as Earth's, how would its $GPE$ at a height of $1\ meter$ compare to its $GPE$ at $1\ meter$ on Earth?

A $0.5\ kg$ bird is flying at a constant speed of $2\ m/s$. What is its kinetic energy?

When an object is lifted vertically, the work done on the object is numerically equal to its change in:

What is happening to the energy of a pendulum bob as it swings from its highest point down to its lowest point (neglecting friction)?

A $2\text{ kg}$ drone is flying at a constant height of $10\text{ m}$ with a speed of $4\text{ m/s}$. What is its total mechanical energy? (Use $g = 10\text{ m/s}^2$)

According to the Law of Conservation of Energy, in a system where only gravity acts on an object:

A car's kinetic energy is $128\text{ J}$ and its mass is $4\text{ kg}$. What is its velocity?

How much work is done by a $60\text{ W}$ light bulb in one hour?

A ball is released from rest at the top of a smooth ramp. At which point is the sum of its potential and kinetic energies the lowest?

A $10\text{ kg}$ block is pushed $5\text{ m}$ along a horizontal surface by a force of $50\text{ N}$. If the coefficient of friction causes a $20\text{ N}$ resistive force, what is the net work done on the block?

If a force of $10\ N$ is applied to the left and $10\ N$ is applied to the right on an object, what is the resultant force?

Which force is experienced by an airplane as it flies through the sky, opposing its forward motion?

Why do hiking boots have deep treads on the soles?

Which of these can a force NOT change?

If a car is traveling at a constant speed in a straight line, what can you conclude about the horizontal forces acting on it?

How does the gravitational field strength ($g$) on Jupiter compare to that on Earth?

Which force acts against the motion of an object through a liquid?

A charged rod is used to charge an electroscope by induction. Which of the following is a necessary step to ensure the electroscope retains a net charge after the rod is removed?

A student claims that since 'every action has an equal and opposite reaction', the net force on every object must be zero and nothing can ever move. What is the error in this reasoning?

What happens to the tension in a vertical rope holding a stationary $50 \text{ kg}$ mass if the mass is suddenly accelerated upward at $5 \text{ m/s}^2$?

If you are pushing a box with a force of $10\text{ N}$ to the right, and your friend pushes it with $5\text{ N}$ to the left, what is the net force?

A lamp hangs stationary from a ceiling. What is the net force acting on the lamp?

Lubricants like oil are used in engines primarily to:

Which surface would likely produce the most friction against a sliding wooden block?

Which of the following describes a situation where the forces are unbalanced?

If you push a cart with a constant force and the mass of the cart is suddenly doubled (e.g., by dropping a load into it), what happens to the acceleration?

A $70\text{ kg}$ person stands on a scale in an elevator that is moving at a constant speed of $2\text{ m/s}$ upward. What is the net force on the person?

If an object is moving in a circle at a constant speed, which of the following must be true?

A $2500\text{ kg}$ truck is accelerating at $2\text{ m/s}^2$. If the truck then hooks up to a $2500\text{ kg}$ trailer and the engine provides the same net force, what is the new acceleration?

How does the inertia of a $5\text{ kg}$ object on Earth compare to its inertia on the Moon?

Which property of a wave is measured from the rest position to the crest?

A wave has a frequency of $100 Hz$ and a wavelength of $3 m$. What is its speed?

What color do you get if you mix red and green light?

What happens to sound when it is absorbed by a soft surface like foam?

Light waves and sound waves have different physical characteristics and behave differently when traveling through a medium. Based on the classification shown in the diagram, which of the following correctly identifies Property A and Property B?

In which medium will sound travel the slowest?

When all three primary colors of light are mixed with equal intensity, what color is produced?

In a vacuum, all electromagnetic waves have the same:

How does the speed of light in a vacuum ($c$) compare to the speed of light in air ($v_{air}$)?

A tuning fork is vibrating at $440\text{ Hz}$. If a second tuning fork is struck and a 'beat' frequency of $4\text{ Hz}$ is heard, what are the possible frequencies of the second fork?