A force is any push or pull from one object to another.
100
Work = _____ x ______.
Work = force x distance.
100
What is a simple machine?
A simple machine is a machine that takes one force and changes its direction, distance, or strength.
100
What is velocity?
Velocity is the measurement that combines both the speed and the direction of a moving object.
200
What is motion?
Motion is a change in position over time.
200
What is friction?
Friction is a force that opposes the motion of one object moving past another.
200
What is work?
Work is the measuremet of the energy used to perform a task.
200
Simple machines can be found in ______.
Simple machines can be found in nature.
200
What is acceleration?
Acceleration is the change in velocity over time for an object.
300
What are motion's two parts?
Motion has two parts: distance and direction.
300
What are balanced forces?
When forces act on an object without changing its motion, they are called balanced forces.
300
Which of these two is work:
a) holding weights up
b) lifting weights up
Lifting weights up is work, holding them up is not.
300
Gears are a type of ____ and ____.
Gears are a type of wheel and axle.
300
What is momentum?
Momentum is the product of mass multiplied by velocity.
400
What is a frame of reference?
A frame of reference is a group of objects from which you can measure a position or the motion.
400
What is a unbalanced force?
A force that causes an object to change its motion is called an unbalanced force.
400
What is energy?
Energy is the ability to preform work or to change an object.
400
When two or more simple machines are combined, they form a ________ _______.
When two or more simple machines are combined, they form a compound machine.
400
What is Newton's second law?
Newton's second law is: "The unbalanced force on an object is equal to the mass of the object multiplied by its acceleration: F = m x a.
500
What is speed?
Speed is how fast an object's position changes over time.
500
What is Newton's first law?
Newton's first law is: "An object at rest tends to stay at rest, and an object in constant motion tends to stay in motion, unless acted upon by an unbalanced force."
500
What is kinetic energy?
Kinetic energy is the energy of a moving object.
500
What is efficiency?
Efficiency is the ratio of imput energy to output work, usually written as a percentage.
500
What is Newton's third law?
Newton's third law is: "All forces occur in pairs, and these two forces are equal in strenghth and opposite in direction."