Motion and Simple Machines

The unit of work is called a

• Newton

• Joule

• joule/meter

• Gram

An ax, a zipper and a front tooth are examples of a simple machine called a

• Lever

• Screw

• Wedge

• Pulley

__________ form a compound simple machine with one toothed wheel and axle linked to another toothed wheel and axle.

• Levers

• Gears

• Inclined planes

• Screws

The fixed point that a lever rotates around is called a(n)

• Fulcrum

• Wedge

• Input force

• Output force

Which of the following is NOT a type of pulley?

• Compound pulley

• Adjustable pulley

• Moveable pulley

• Fixed pulley

Newton’s first law of motion states that

• Force equals mass times acceleration

• Every object attracts every other object in the universe.

• An object in motion stays in motion and an object at rest stays at rest unless acted upon by an unbalanced force.

• Energy cannot be created or destroyed.

What is the speed of an airplane that moves 150 meters in 3 seconds? Use Speed = Distance/Time

• 50 m/s

• 1800 m/s

• 180000 m/h

• 5000 m/s

A car traveling at 25 m/s speeds up to 40 m/s over a period of 15 seconds. This is an example of

• Inertia

• Force

• Acceleration

• Work

How many centimeters are in 1 meter?

• 1

• 10

• 100

• 1000

Trish has a brick in her treehouse. She knows that she can create a downward force by pushing the brick over the edge. To utilize the force of the brick to raise her lunchbox from the ground, Trish should use which simple machine along with her brick and rope?

• An inclined plane

• A pulley

• A lever

• A screw