Science 8 Final Review - Mechanical Systems

Which of the following describes a 3rd-place lever?

• load force located between the effort force and fulcrum

• effort force located between the load force and fulcrum

• fulcrum located between the effort and load forces

• effort force and load force in same location

A(n) __________ is a simple machine that consists of two round objects that rotate together.

• movable pulley

• hand-operated can opener

• inclined plane

• wheel and axle

Tags

NGSS.MS-PS2-1

Which one of the following is the appropriate sub-heading for A, B, C and D?

• A - wheel and axle

  B - Inclined plane

  C - pulley

  D - lever

• A - wheel and axle

  B - pulley

  C - inclined plane

  D - lever

• A - Gears

  B - Inclined plane

  C - Pulley

  D - wheel and axle

• A - Gears

  B - Pulley

  C- lever

  D - inclined plane

A disadvantage of a ramp is

• you gain a force advantage

• you lose a force advantage

• you gain a speed advantage

• you lose a speed advantage

Which of the following statements about both machines are true?

• Both contain a movable pulley.

• The effort and the load move in opposite directions for both machines.

• The effort needed to lift the same load is the same for both machines.

• The effort moves over a greater distance than the load for both machines.

A machine can do any of the following, except

• Increase work output

• Increase speed

• Increase force

• Change direction

How does a ramp make it easier to move a heavy object a certain distance?

• by decreasing the amount of effort required to move the object

• by decreasing the amount of work required to move the object

• by decreasing the distance the object moves

• by changing the direction in which the object moves

Tags

NGSS.MS-ETS1-1

Based on the diagrams, which of the objects above have potential energy other than gravitational potential energy?

• new battery and butter only

• jack-in-the-box and elastic band only

• jack-in-the-box, new battery and butter

• jack-in-the-box, new battery, butter and elastic band

Which one of the following shows the correct headings?

• A - sound energy

  B - light energy

  C - potential energy

  D - kinetic energy

• A - electrical energy

  B - heat energy

  C - potential energy

  D - sound energy

• A - electrical energy

  B - heat energy

  C - chemical energy

  D - sound energy

• A - sound energy

  B - light energy

  C - heat energy

  D - kinetic energy

Which one of the following describes the changes in the potential and kinetic energy from A to B?

• Potential energy - decreases

  Kinetic energy - decreases

• Potential energy - decreases

  Kinetic energy - increases

• Potential energy - increases

  Kinetic energy - increases

• Potential energy - increases

  Kinetic energy - decreases

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-2

NGSS.MS-PS3-4