A
A force that makes something can be a ________ or a ____________.
Push or a pull
Force
The act of moving or changing position is called_________
Motion
What is potential energy?
stored energy
A measure of how fast something moves over a certain distance is called ___________.
Speed
Work
When two equal forces act in opposite directions, the result is that the forces are equal and there is no motion.
Balanced Force
What is kinetic energy?
The energy of motion.
When one force is stronger than the other, the result is motion. What type of force is this?
Unbalanced force
A force that attracts objects toward the Earth is called _______
Gravity
What are two non-contact forces?
*Bonus- describe what non-contact forces are*
Magnetism and Gravity. Non-contact forces are forces that do not touch the object to make it move.
Who has more energy, a skier onto of the hill or a skier half way down the hill?
The skier at the top of the hill.
Name three ways that forces can make objects move.
*Bonus if you can name the 4th one*
They can cause objects to start moving, speed up, slow down, or stop moving.
Explain balanced and unbalanced forces.
Balanced Forces have no motion. Unbalanced forces causes motion. Think about the dogs pulling on the rope.
Does weight affect an objects motion?
YES! It is easier to put an object in motion if it is lighter. It requires more force to move a heavier object
Give an example of how kinetic energy changed to potential energy and then back to kinetic energy.
When you are riding a bicycle up a hill, you have kinetic energy. When you are at the top of the hill you have potential energy because you are not in motion. When you go down the hill you are using kinetic energy.
Explain contact forces
Contact forces happen between objects that touch. (A baseball bat makes contact with the baseball and causes the baseball to change directions).
Is work being done if movement doesn't occur?
No. Work only happens if movement happens.
Would an airplane taking off be potential energy changing to kinetic energy or kinetic energy changing to potential energy?
Potential energy changing to kinetic energy.