Newton's Laws of Motion

All mechanical devices:

Take Newton’s laws for granted in their operation

Newton’s first law describes:

The unchanging state of motion of an object when it experiences no net force

Why does a heavy crate suspended by a pulley only able to avoid crashing to the ground in Newton’s first law?

Because the attached ropes fully counteract the force of gravity pulling the mass downwards

What summarizes this formula?

F=ma

Newton’s second law

F can be measured in:

newtons

M can be measured in:

Kilograms

A can be measured in:

Meters per second squared

Newtons second law expresses the:

Linear relationships between either the mass of the moved object or the desired acceleration, with the force required to achieve that movement

In Newton’s second law, one of the most historical roles of machines has been:

In multiplying the force a human or work animal provides in order to move very massive objects that’d be otherwise immobile

Ancient structures including Stonehenge and the Egyptian pyramids are:

Evidence of a long human tradition of mechanical aids to labor

Newton’s third law states that:

For every action there is an equal and opposite reaction

Newton’s third law applies to:

All applications of force, including those mediated by simple machines

Why is it possible to pull on a rope and pulley to lift a weight?

Only because the force of tension is carried through a rope by a daisy chain of action reaction force pairs from one section of rope to the next