Work, energy & power - CIE IGCSE Physics

Equation for kinetic energy

• $Kinetic\ energy\ =\ \frac{1}{2}mv^2$

• $Kinetic\ energy\ =\ \frac{1}{2}mv^3$

• $Kinetic\ energy\ =\ \frac{1}{2}mv^{ }$

• $Kinetic\ energy\ =\ mv^2$

Tags

NGSS.HS-PS3-2

Equation for gravitational potential energy (GPE)

• $GPE\ =\ m\times g\times\Delta h$

• $GPE\ =\ m\times\Delta g\times h$

• $GPE\ =\Delta m\ \times g\times h$

• $GPE=F\times g\times h$

Tags

NGSS.HS-PS3-2

Link between force, work done and distance

• work done = force x distance
• work done = distance / force
• work done = force / distance
• work done = force x work
• work done = force / work

Link between energy transferred and work done

• energy transferred = work done

• energy transferrred = 1/2 work done

• energy transferred = work done2

• energy transferred = 1 / work done

• energy transferred = 4/3 π x work done³

Efficiency equation

• efficiency = useful output / total input
• efficiency = total output / total input
• efficiency = total input / total output
• efficiency = total input / useful output
• efficiency = useful output / useful input

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

The unit of work is

• watt

• hertz

• joule

• pascal

Each of the boxes shown is pulled for 10 m across a level, frictionless floor by the force given. Which box experiences the greatest change in its kinetic energy?

• A

• B

• C

• D

• E

Tags

NGSS.HS-PS2-1

Starting from rest, a marble first rolls down a steeper hill, then down a less steep hill of the same height. Ignoring friction, for which is it going faster at the bottom?

• Faster at the bottom of the steeper hill

• Faster at the bottom of the less steep hill

• Same speed at the bottom of both hills

• Can’t say without knowing the mass of the marble

Four students run up the stairs in the time shown. Which student has the largest power output?

• A

• B

• C

• D

A major league pitcher can throw a baseball with a kinetic energy of 150 J. How much work must the pitcher do to the ball to give it that much KE?

• 150 J

• 0

• Can’t tell without knowing the mass of the ball

Tags

NGSS.HS-PS3-2