DO NOW Q1. Give 1 example of kinetic energy Q1. Give 3 examples of potential energy

DO NOW (ANSWERS) Q1. Give 1 example of kinetic energy: A moving car, a rolling ball, a galloping horse Q1. Give 3 examples of potential energy 1. Chemical potential energy in food or fuel 2. Elastic potential energy in a rubber band or a trampoline 3. Gravitational potential energy in a skydiver

KINETIC ENERGY  SOUND ENERGY (clapping, talking, playing a guitar) Energy Equations 1. For each of the energy equations below, give three examples of things which change energy in the way shown. KINETIC ENERGY  SOUND ENERGY (clapping, talking, playing a guitar) CHEMICAL ENERGY  HEAT ENERGY (Firework, match, coal fire) KINETIC ENERGY  HEAT ENERGY (brakes, skiing, sanding wood) ELECTRICAL ENERGY  HEAT ENERGY (heater, lamp, soldering iron) 2. State which energy changes are being described in the sentences below. e.g. ‘the water bubbled as it was heated on the stove’ For this sentence you could write  ELECTRICAL ENERGY  HEAT ENERGY + SOUND ENERGY The wood crackled and flames appeared when the fire was lit. Chemical PE → heat + sound The window shattered when the brick hit it. Kinetic → sound The tyres screeched as the car came around the bend. Kinetic → sound The steam hissed out of the iron. Kinetic → sound The stone flew out of the catapult. Elastic PE → Kinetic The Space Shuttle rose slowly off the launch pad. Chemical PE → kinetic → gravitational PE. 3. This is a diagram of a hydroelectric power scheme. Water, which has been trapped behind a dam, flows down a slope. The moving water turns a generator, which makes electricity.  Write an energy equation for this process. Some of the electricity generated is used to provide energy for an elevator in a building, which lifts people to the top of the building. Add in extra steps in your energy equation to show these extra energy changes. Gravitational PE → Kinetic → electrical → kinetic → gravitational PE 4. Write an energy equation for each of the pictures shown on this sheet. ELECTRICAL ENERGY  HEAT ENERGY ELECTRICAL ENERGY  HEAT ENERGY + sound energy

Today: Graph activity

Rachel and Stephen are moving with a constant speed since the slope of the line is constant. Rachel – 5 ms-1; Stephen – 3 ms-1; Kepa is accelerating. The slope is increasing so her speed is increasing.

Rachel – Constant speed of 7 ms-1 for 3 s then a constant deceleration to rest in a further 7 s. Stephen – Constant acceleration from rest to 10 ms-1 in 10 s. Kepa – Constant acceleration from rest to 10 ms-1 in 5 s followed by a constant deceleration to rest in a further 5 s.