Year 9 Energy Revision

Year 9 Energy cALCULATIONS Revision Quiz

Revising P05 to P11 Remote Learning Part 1 GET A CALCULATOR READY!!!

Multiple Choice

What kind of energy is as a result of movement?

• gravitational

• kinetic

• chemical

• elastic

Multiple Choice

What is the kinetic energy equation?

• $\frac{1}{2}mv^3$

• 
  

  $\frac{1}{2}mv$

• $\frac{1}{2}mv^2$

• $mv^2$

Multiple Choice

What does m x g x h work out?

• kinetic energy

• elastic PE

• gravitational PE

• Nothing much at all!!!

Multiple Choice

A brick of mass 2kg, is lifted to 2m off the ground. Assume g = 10N/kg. What is the GPE stored?

• 20J

• 14J

• 200J

• 40J

Multiple Choice

A roadrunner of mass 5kg runs at 10m/s. What is it's Kinetic energy?

 $KE\ =\ \frac{1}{2}mv^2$  

• 200J

• 50J

• 25J

• 250J

Multiple Choice

A snake of mass 2kg slides at 5m/s. What is its Kinetic energy?

• 25J

• 50J

• 5J

• 500J

Multiple Choice

A lift is hoisted 5m into the air. It has a mass of 20kg. How much GPE is stored. (g=10N/kg)

 $GPE\ =\ m\times g\times h$  

• 200J

• 10J

• 1000J

• 1000J

Multiple Choice

Higher Tier Only: What is the elastic potential energy of a spring if stretched by 50cm. (k=10N/m)

 $EPE\ =\ \frac{1}{2}ke^2$  

• 250J

• 12,500J

• 1.25J

• 10J

Multiple Choice

What is the effiency of a motor into which 200J of electrical energy is transferred to 50J useful energy?

 $Efficiency\ =\ \frac{useful\ energy\ out}{total\ energy\ in}$  

• 0.25

• 1

• 4

• 0.025

Multiple Choice

Higher: What is the energy input for a car engine which has an efficiency of 25% and useful output energy of 200J (per second)

• 880J

• 50J

• 5

• 800J