Lesson 1 p. B36
What is force?
The push or pull on an object that can cause it to change motion.
What is kinetic energy? (Give an example)
Kinetic energy is energy of motion. An example is a swing going back and forth.
What is work?
The result of a force moving an object.
What is friction?
A force that slows the motion of moving objects.
What is inertia?
The tendency of an object to keep moving or stay at rest.
When you are sitting on the top of a slide, what kind of energy do you have?
Potential energy.
When is work done?
When pushes and pulls move objects.
What is the name of the force that pulls any two objects toward one another?
Gravity.
If I am rollerskating and I stop by pushing myself, what force will slow me down?
Friction.
What is mechanical energy?
Mechanical energy is both potential and kinetic energy.
What is the difference between a simple and compound machine?
A simple machine is a machine made of one or two parts. A compound machine is a machine made of two or more simple machines.
What is chemical energy? Give an example.
It is energy that comes from chemical changes. An example would be a battery-powered toy car.
True or false: Gravity is a force that can be measured.
True.
What is potential energy?
Energy that an object has because of position. (stored energy)
I am used to lower and raise heavier objects up and down. What am I?
A pulley.
What is a wedge? Give an example.
A simple machine that has slanted sides. Ex: a nail
Why do astronauts weigh less on the moon than on Earth?
The moon has less gravity than earth.
A merry-go-round uses what kind of energy?
Electrical energy.
Name two compound machines.
Ex: scissors and bikes.
What is a complex machine? Give an example.
A machine made of many simple and compound machines. A car's engine is an example.