Forces
Billy was fighting over a toy with his sister, Becky. Billy and Becky were both pulling on the toy with equal force and it was not moving. This is what kind of force?
Balanced Force
Stored Energy
Potential Energy
The distance an object travels over time is _________.
Speed
What kind of energy is transferred in a collision?
kinetic energy
When two objects touch, such as a baseball and a bat, it is what kind of force?
Contact Force
Energy of Motion
Kinetic Energy
The speed and direction of an object is its _______.
velocity
This is the measure of how easy or difficult it is to move an object. When you increase the speed, you increase this. If this is higher, there is also more energy.
Momentum
This is a noncontact force which keeps us all grounded on Earth.
Gravity
heat energy
When the velocity changes, the object has ______________.
accelerated or has acceleration
When two objects hit each other with a force, this is called a _____________.
Collision.
This is a force that can stop a moving object.
Unbalanced Force or Friction
The amount of kinetic energy an object has is related to its mass and ______________.
speed or velocity
As the amount of force on an object increases, the acceleration of the object _____________.
increases.
What happens to the kinetic energy in a collision?
- Some is transferred causing a change in motion
- Some is transformed into other forms of energy such as heat or sound
Forces are defined as a push or a pull. All forces require ______________ in order to do the work.
Energy - the ability to do work
Energy can neither be created or destroyed. What is this called?
the Law of Conservation of Energy
True or False:
When a car slows down to a stop, it is accelerating.
Explain your choice.
True - Acceleration is when something changes its speed or direction. Slowing down is changing the speed, so it is also acceleration.
Other than cars crashing, what is an example of a collision in which kinetic energy is transferred?
Answers May Vary:
Typing on a computer (pressing keys)
Playing an instrument (pounding a drum, pressing keys on a piano, pressing strings on a violin).
Playing a sport (hitting a tennis ball with a racket, hitting a baseball with a bat, kicking a soccer ball)