1b Energy and Work Quiz alevel edexcel

Kinetic energy is given by the formula:

• KE=½mv^2

• KE=mgh

• KE=Fd

• KE=P

Conservation of energy states that:

• Energy can be created but not destroyed

• Total energy of a closed system remains constant over time

• Total energy of a system increases with time

• Energy is not conserved in any physical process

Gravitational potential energy depends on:

• Themass of the object

• The velocity of the object

• The height of the object relative to a reference point

• The acceleration due to gravity

Work done by forces acting at an angle is calculated using:

• W=Fd

• W=Fdcos휃

• W=Fdsin휃

• W=½mv^2

The formula for free fall velocity near the Earth's surface is:

• v=√2gh

• v=mg/h

• v=h/mg

• v=2gh/m

Work efficiency is calculated as:

• Efficiency=output work/input work

• Efficiency=output work/input energy

• Efficiency=input work/output work

• Efficiency=input energy/output energy