Physics Quiz

An object of mass 2 kg has a kinetic energy of 48 J. Its velocity is:

Mechanical advantage is the ratio of:

• a) Output force to Input force

• b) Input force to Output force

• c) Work output to Work input

• d) Work input to Work output

The force that causes motion is called the:

• a) Load force

• b) Effort force

• c) Friction force

• d) None of the above

A system with multiple pulleys provides:

• a) Higher mechanical advantage

• b) Higher velocity ratio

• c) Higher efficiency

• d) Both a and b

The weight to be lifted is called the:

• a) Effort

• b) Load

• c) Fulcrum

• d) Mechanical advantage

Increasing the length of the load arm in a lever:

• a) Increases the mechanical advantage

• b) Decreases the mechanical advantage

• c) Has no effect on the mechanical advantage

• d) Depends on the effort arm length

A worm gear is a combination of:

• a) Screw and inclined plane

• b) Lever and pulley

• c) Wheel and axle

• d) None of the above

A fixed pulley is used to:

• a) Change the direction of the force

• b) Increase the effort force

• c) Decrease the effort force

• d) Increase the load

Which has the highest efficiency?

• a) Ideal machine

• b) Compound machine

• c) Simple machine

• d) They are all equally efficient

To reduce the effort force for a given load, increase the:

• a) Velocity ratio

• b) Mechanical advantage

• c) Both a and b

• d) Efficiency