Work and Machines

What is the scientific definition of work?

• Force applied through a distance

• Exerting a force with muscles

• Earning money

When is the maximum amount of work done on an object?

• When force and motion are parallel

• When force and motion are perpendicular

• When force is applied at an angle

• When no force is applied

What is the unit of measurement for work in the scientific context?

• Joules

• Newtons

• Meters

• Watts

Which of the following is a simple machine?

• Lever

• Bicycle

• Scissors

• Car jack

What is the mechanical advantage of a machine?

• The ratio of output force to input force

• The ratio of input work to output work

• The ratio of speed to force

• The ratio of distance to force

How can machines be made more efficient?

• By reducing friction

• By increasing input work

• By increasing output work

• By using more complex designs

What happens when a force is perpendicular to motion?

• The work done is zero

• The work done is maximum

• The work done is equal to force multiplied by distance

• The work done is negative