Speed and Energy
What do we call the energy an object has because it is moving?
Name one way that energy can change when a collision occurs.
kinetic energy can become heat energy and sound energy,
What word describes what happens when two objects bump into each other?
collision
What is one piece of evidence to show that an object has energy because it is moving?
The object changes it position (motion); the object has speed; the object can transfer its energy during a collision.
If two identical toy cars move at different speeds, which one has more energy: the slower car or the faster car?
faster
When you rub your hands together, what happens to the kinetic energy?
it becomes heat and some sound energy.
When a soccer player kicks a stationary ball and it bounces across a field, what happens to the energy of the soccer player's foot?
It transfers to the ball.
Why does a toy car make a louder noise during a collision if it is moving fast vs. if it is moving slowly?
The faster the car, the more energy at the collision and the more energy that can transform into sound.
What word to we use to describe any change in motion (i.e. speed or directions)
Acceleration
You push a car and it rolls across the floor. Where did the energy come from and how did it make the car move.
The energy came from you and transformed the potential energy of the car into kinetic energy.
Explain what would happen if a small child ran into an adult standing still.
a collision occurs and the child will most likely fall back while the adult moves very little.
Heat energy can be produced through friction. How can the amount of heat energy created be increased?
rubbing the surfaces together faster to increase the friction.
Give an example showing how a faster moving object has more energy.
varied: exp. tapping someone on the shoulder vs slapping someone on the shoulder
What evidence can be used to show that some kinetic energy turned into sound energy during a collision?
You hear she crash
Which is NOT an example of a collision causing energy transfer and change in motion: a bat strikes a baseball; a catcher catches a baseball; a baseball hits the ground; a baseball flies through the air?
A baseball flies through the air
A student pushes a ball down a ramp at different speeds. Which speed will give the ball more energy when is collides with a stationary object? 10cm/s; 8cm/s; 6cm/s; 4cm/s
10cm/s
How can you increase the force of a wrecking ball so that it causes greater damage to a building?
raise the ball higher to increase its potential energy which will give it more kinetic energy when it swings.
Describe how energy can be transferred into the air during a collision.
sound and heat
Two identical objects collide into each other with the same force. What outcome do you predict for these objects?
Both objects will bounce back with an equal amount of force.
Look at the image of the Potential Energy line graph. What generalization can be made about the height of an object and the amount of energy that object has?
The higher the object, the greater the amount of energy.