Force and Tools Quiz

What is the relationship between efficiency and mechanical advantage?

• Efficiency is always greater

• Efficiency is always less

• Efficiency is the same as mechanical advantage

• Efficiency is unrelated

What does the amount of input work done by the gardener equal?

• The amount of output work done by the shovel

• The amount of input work done by the shovel

• The amount of work done by the gardener's hands

• The amount of work done by the soil

What does the graph in the image show?

• The speed of cars on different roads.

• The input force and output force for three different ramps.

• The height of different buildings.

• The temperature changes over a week.

What variable is plotted on the horizontal axis?

• Input force

• Output force

• Ramp height

• Speed

If an 80-N input force is exerted on Ramp 2, what is the output force?

• 400 N

• 300 N

• 200 N

• 100 N

Calculate the mechanical advantage of a hammer if the input force is 125 N and the output force is 2,000 N.

• 16

• 20

• 25

• 10

Find the efficiency of a machine that does 800 J of work if the input work is 24,000 J.

• 3.33%

• 5%

• 10%

• 2%

Find the force needed to lift a 2,000 N weight using a machine with a mechanical advantage of 15.

• 133.33 N

• 150 N

• 200 N

• 100 N

What is a lever?

• A ridged bar that is free to pivot on a fixed point.

• A wheel that rolls on a surface.

• A flat surface that slides easily.

• A rope used to pull objects.

What are most of the machines in your body made of?

• Bones and muscles

• Metal and gears

• Plastic and springs

• Wires and circuits