Energy Lesson 2

Energy Lesson 2

Let's Review Before your brain party tomorrow!!

What have we learned in lesson 2 of Energy?

• Energy can be transferred

• Energy is conserved

• What happens during a collision?

• During a collision energy can produce sound, light and heat

COLLISIONS AND SOUND, LIGHT, AND HEAT

Energy Produces Sound

Some of the energy transferred during a collision produces sound. For example, the ball and the bat both have energy of motion because they are both moving. Energy transfers between the ball and the bat when they collide, so the ball's motion changes direction.

COLLISIONS AND SOUND, LIGHT, AND HEAT

Energy Produces Light

Sometimes light is produced when objects collide. This light transfers some energy away from the objects. For example, people can start fires by hitting a kind of rock called flint against a piece of steel.

COLLISIONS AND SOUND, LIGHT, AND HEAT

Energy Produces Heat

When objects collide, some of the energy is transferred and produces heat. Energy moves between any moving object and the surface it touches. When the energy moves, it creates heat and makes both objects warmer. That is why quickly rubbing your hands together warms them. Some of the energy of motion is changed into heat.

Multiple Choice

Scientists cannot predict what would happen when objects collide if

• light were not conserved.

• energy were not conserved.

• speed affected the amount of energy.

• weight affected the amount of energy.

Multiple Choice

Some of the energy transferred during a collision can produce ________.

• heat

• light

• sound

• all of the above

Multiple Choice

When two objects of the same weight traveling at different speeds collide head on, both objects

• stop moving.

• bounce backwards and change speeds

• change direction and move at their original speed

• bounce backward and travel at their original speed.

Multiple Choice

7. Most objects that collide transfer energy to the air as

• light

• weight

• sound

• motion

Multiple Choice

A bouncing ball will eventually stop moving because

• energy is transferred as heat

• energy is created by sound

• energy is destroyed by by the ground

• all of the above

Multiple Choice

3. When a heavier object collides with a lighter object, the lighter object

• completely stops

• moves faster

• moves slower

• moves at the same speed

Multiple Choice

Which of the following collisions would cause a still object to move at the speed of the object that hit it?

• a collision of a moving object with a lighter still object

• a collision of a moving object with a heavier still object

• a collision of a moving object with a still object of the same weight

• a collision of a large, light object and a still object that is smaller, heavier

Multiple Choice

What happens when two objects collide?

• Energy is transferred from one object to another.

• Energy is created and the objects move faster.

• Energy is destroyed and the objects move slower.

Multiple Choice

What effects the amount of energy transferred in a collision?

• the speed and direction affects a collision

• the speed and the weight affect a collision

• the weight and direction affects a collision

• the direction and heat affects a collision