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Lesson: Collisions and Energy Transfer Science • 4th Grade

In this lesson, we will learn how to investigate the effects of collisions and explain and predict the energy changes that take place when objects collide.

Lesson Plan

Students will be able to

define collision,
explain and predict the energy changes that occur when objects collide,
identify elastic and inelastic collisions,
use a Newton’s cradle to explain elastic and inelastic collisions,
investigate how speed affects collisions,
define inertia,
describe the effects of inertia in collisions,
describe the effects of an object’s mass on its inertia,
define momentum,
describe the effects of momentum in collisions,
describe how safety devices are useful during collisions,
explain what is meant by the term conservation of energy.

Lesson Worksheet

Q1:

Jackson and Mia are discussing collisions. Who has the best definition?

Q2:

An object that has more momentum has more energy.

Fill in the blanks: During a car collision, a car with greater momentum will move a car with less momentum. More energy is transferred from the car with momentum to the car with momentum.

Q3:

This device is called a Newton’s cradle.

When a sphere on the end is lifted and dropped, its energy is transferred to the other spheres and the sphere on the opposite end is pushed upward. This sphere then swings back and causes the first one to fly up again.

Fill in the blanks: There is a transfer of kinetic energy between the first and last spheres because . We say the collisions are because the device does not lose much kinetic energy.