Which is the best reason for not using a moving car as a reference point?

Which of the following is the best reference point for describing the motion of the planets in our solar system?

Jeff is in a stationary school bus in the front of his school. Which of these is the best reference point for him to use to determine when the bus starts to move?

If a car traveled 78 miles in 1.30 hours, what speed was the car traveling? (Speed=Distance/Time)

The SI unit for measuring distance is the ________.

____________ is the length of the path between two points.

A ___________________ is a place or object used for comparison to determine if something is in motion.

David pushes on a book cart with 50N of force. The cart will not start moving unless David overcomes 10N of friction. What is the net force on the cart when David starts pushing? (

Work/Time=______________

The unit of work is the ___________

The unit of power is the ___________.

The force you exert when you use a machine is the __________.

The force exerted by the machine is the _____________.

Divide output work by input work and multiply by 100% to find a machine's.....

The fixed point that a lever pivots around is the _______.

A single fixed pulley changes the ____________ of a force.

A system of fixed and __________ pulleys is called a block and tackle.

Work is done on an object when the object moves in the same direction as the force applied.

The more power you use to move an object, the more work you do.

The farther you move an object, the more work you do.

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