Mechanical Systems Unit Test

What is the primary function of a machine?

• To create energy

• To help humans do work more efficiently

• To reduce energy consumption

• To increase friction

Early machines were

• Complex devices that relied on electricity for their source of energy.

• Very simple devices that depended on people and animals for their source of energy.

• Advanced devices that used steam power and required minimal human or animal effort.

• Simple devices that operated independently without any external energy source.

What are the characteristics of a simple machine?

• A device with many moving parts, makes work harder, and requires more force.

• A device with many moving parts, makes work easier, and requires less force.

• A device with few or no moving parts, makes work easier, and requires less force.

• A device with no moving parts, makes work easier, and requires more force.

Which of the following is an example of a simple machine?

• Bicycle

• Car engine

• Lever

• Computer

What is the mechanical advantage of a machine that applies an output force of 600 N with an input force of 50 N? Formula: MA = Output Force / Input Force.

• 12

• 15

• 7.8

• 10

Which simple machine consists of a wheel with a groove and a rope or cable?

• Lever

• Inclined plane

• Pulley

• Wedge

What is the purpose of an inclined plane?

• To split objects apart

• To change rotational motion into linear motion

• To amplify force

• To reduce the effort needed to lift heavy objects

What is the unit of measurement for work?

• Newtons (N)

• Joules (J)

• Watts (W)

• Meters (m)

Which of the following statements about gears is true?

• Gears can only increase speed

• Gears can change the direction of motion

• Gears cannot be used to reduce force

• Gears always increase the force applied

It takes 50 N of force to move a box 5 m. How much work is done?

Formula: Work (J) = Force (N) x Distance (m).

• 350 J

• 300 J

• 250 J

• 200 J