Motion
What is a change in an object’s position over time
motion
What is friction?
a force that opposes the motion of one object moving past another
What is the formula to find work?
Work=force x distance
List 5 simple machines
Wheel and Axel, Pulley, Lever, Inclined Plane, Screw, Wedge
What is velocity?
the speed and direction of a moving object
What are forces that do not cancel each other out and that cause an object to change its motion
unbalanced forces
What is the law of conservation of energy?
energy is never created or destroyed, it only changes form
Give an example of a compound machine we use.
scissors, wheelbarrow, pizza cutter
How fast can Usain Bolt run?
27 mph
What is Newton's 3rd law of motion?
For every action there is an equal but opposite reaction
**Action force - initial push or pull of one object on another.
**reaction forces - the push or pull of a second object back on the object that started the push or pull
Explain the difference between potential and kinetic energy
potential energy - energy stored in the position or structure of an object
kinetic energy - the energy of a moving object
Draw and label a first-class lever
Effort on one end of lever, and load on the other end. Fulcrum in the middle.
What is the formula to find momentum?
P=mv
What are the 4 forces on an airplane?
Lift, thrust, drag, weight
What is work?
the use of force to move an object a certain distance, or to change an object
What is efficiency?
the measurement of how much useful work a machine puts out compared to the amount of work put into it