Work, Energy & Power

In physics, work is defined as ...

The SI unit of work is ...

The formula for an object's kinetic energy is ...

The formula for gravitational potential energy is ...

Power is defined as ...

The law of conservation of energy states that ...

A force of $20\text{N}$ pushes an object $5\text{m}$ in the direction of the force. The work done is ...

A $2\text{kg}$ object moves at $4\text{m/s}$. Its kinetic energy is ...

A $3\text{kg}$ object is at a height of $5\text{m}$ with $g=10{\text{m/s}}^2$. Its potential energy is ...

A machine does $600\text{J}$ of work in $4\text{s}$. Its power is ...

A $50\text{N}$ force acts at $60^{\circ }$ to a $4\text{m}$ displacement. The work done is ...

A $1\text{kg}$ object falls from $20\text{m}$ with $g=10{\text{m/s}}^2$. Its kinetic energy at a height of $5\text{m}$ is ...

For an object in free fall, potential energy changes into ...

A $2\text{kg}$ object accelerates from $2\text{m/s}$ to $6\text{m/s}$. The work done is ...

A $2\text{kg}$ object is raised along a frictionless incline to a height of $3\text{m}$ with $g=10{\text{m/s}}^2$. The minimum work needed is ...

A pump lifts $200\text{kg}$ of water $10\text{m}$ high in $5\text{s}$ with $g=10{\text{m/s}}^2$. The pump's power is ...

A spring with a constant of $200\text{N/m}$ is stretched by $0.1\text{m}$. Its potential energy is ...

A motor produces $900\text{J}$ of useful work from $1,200\text{J}$ of input energy. Its efficiency is ...

A $0.5\text{kg}$ ball is thrown vertically from a height of $5\text{m}$ with an initial speed of $10\text{m/s}$ and $g=10{\text{m/s}}^2$. Its speed when it hits the ground is ...

An object slides from the top of a frictionless curved surface $1.25\text{m}$ high with $g=10{\text{m/s}}^2$. Its speed at the bottom is ...