Forces & Machines
This is the name for a device that makes work easier and often saves time, energy, or effort.
Simple Machine or Machine
This simple machine is a slanted flat surface that helps move objects up with less force
Inclined Plane
The energy an object has because it is moving is called ____.
Kinetic Energy
Which simple machine we use to pull water from a well
Pulley
A long bar that helps lift heavy objects; it has three parts called fulcrum, load, and effort.
Lever
What is pulley?
A wheel with a rope around it used to lift or lower things by pulling the rope
What is Potential Energy
The stored energy an object has because of its position or height
Which simple machine would you use to hold two pieces of wood together tightly?
screw
___________ is a pull or push of an object that makes it moves
Force
This simple machine is like a sharp tool with a slanted edge used to split or cut
Wedge
Mechanical energy is the sum of these two types of energy: ____ + ____.
PE + KE
On a roller coaster: at the top most energy is mostly ____; as it goes down, ____ increases and ____ decreases. Fill the blanks with KE or PE.
PE, KE, PE
Which simple machine is made of two cylinders that turn together and helps wheels roll smoothly?
Wheel & axle
A screw is an inclined plane _________ wrapped around a rod or cylinder.
threads
If an object’s mass increases or its speed increases, which type of energy is it?
Kinetic energy
say larger mass or larger speed = larger KE
Two toy cars: both same mass, one is faster. Which has more kinetic energy? Explain using the words mass and speed
one with faster because larger speed = larger KE
Name the type of lever example that goes up and down when two kids sit on opposite ends.
SeeSaw
Give two examples from the notes of tools that use a wedge
A knife, an axe, scissor (any 2 examples)
Explain in one sentence why the toy car at the top of a ramp has more potential energy than the same car at the bottom.
Because of gravitational potential energy
Look at these two toy cars on identical ramps: Car A is heavier than Car B. Which car has more gravitational potential energy? Explain using mass and height.
The heavier car has more potential energy because GPE increases with mass (and with height)