Work
A student pushes on a wall but it doesn’t move. How much work does the student do?
What is no work?
What is the formula for power?
What is Power = Work ÷ Time?
A machine is a device that does what?
What is makes work easier?
Name one simple machine that helps lift an object.
What is a lever, pulley, or inclined plane?
Give a formula for mechanical advantage (MA).
What is MA = output force ÷ input force or MA = input distance ÷ output distance?
What is the formula for calculating work?
What is Work = Force × Distance?
Power is measured in which unit?
What are watts?
What are the three main ways a machine can make work easier?
What is change the size, direction, or distance of the force?
Which simple machine converts a downward force into a horizontal splitting force?
What is a wedge?
A ramp has an input distance of 8 m and an output height of 2 m. What is its MA?
What is 4?
A girl pushes a box with a force of 50 N for a distance of 3 m. How much work is done?
What is 150 J?
A weightlifter lifts 400 N a distance of 0.5 m in 2 seconds. What is his power output?
What is 100 W?
The number of times a machine multiplies the effort force is called what?
What is mechanical advantage?
A screw is what type of simple machine wrapped around a cylinder?
What is an inclined plane?
A wheel has a radius of 9 cm and an axle radius of 3 cm. What is its MA?
What is 3?
A mover applies a 300 N force to move a crate 5 m at constant speed. How much work does he do?
What is 1,500 J?
A girl does 377 J of work pulling a sled up a hill in 53 seconds. What is her power?
What is 7.11 W?
Why can a machine never be 100% efficient?
What is because of friction?
What happens when the angle of an inclined plane increases?
What is the required force increases, distance decreases?
A pulley system lifts a 100 N weight using 25 N of effort. What is its mechanical advantage?
What is 4?
A 3400 N force moves a house 67.2 m horizontally. Calculate the work done.
What is 228,480 J?
A 120 N object is lifted 3.0 m in 1.5 seconds. How much power is used?
What is 240 W?
If a pulley has a mechanical advantage of 2 and lifts a 90 N box, what is the input (effort) force?
What is 45 N?
Increasing the number of threads on a screw makes you rotate it more times but requires _______ force.
What is less?
A lever lifts a 200 N load using 50 N of effort.
What is MA = 4?