Physics Quiz on Work, Energy, and Machines

A first-class lever has:

A second-class lever has:

Fixed pulleys:

A simple machine that increases force is the:

• a) Inclined plane

• b) Wedge

• c) Pulley

• d) Lever

Increasing MA increases:

• a) Effort force

• b) Load force

• c) Both effort and load forces

• d) Neither effort nor load force

Kinetic energy increases with:

• a) Increase in mass only

• b) Increase in velocity only

• c) Increase in both mass and velocity

• d) Decrease in mass

A wedge is used to:

• a) Lift a load

• b) Split an object

• c) Change direction of a force

• d) Both a and b

A complex machine is made up of:

• a) One simple machine

• b) Multiple simple machines

• c) Gears only

• d) Pulleys only

If the efficiency of a machine is 75%, the work output is:

• a) 0.75 times work input

• b) 1.33 times work input

• c) Equal to work input

• d) Cannot be determined

Power is measured in:

• a) J/s or W

• b) J or Nm

• c) N or kg

• d) m/s