Work

Amy uses 30N of force to push an object 10m. How much work does she do?

A muscle contracts to generate a force of 15N and shortens at a velocity of 2 m/s over a period of 3 seconds. How much work does the muscle do?

Shawn applies a force of 30N to stop a car from rolling over his foot. The car moves 5 m before it comes to a complete stop. How much work does Shawn do?

Write equations that describe the relationship between power, velocity, force, time, and work. (Hint: Not all of these variables will be used in one equation. You will need to write multiple equations that incorporate 2 or more of these variables).

For work to be done on an object,
a. some force need only be exerted on the object.
b. the object must move some distance as a result of a force.
c. the object must move, whether or not a force is exerted on it. d. the object must not move.

Which of these is an example of work being done on an object?
a. holding a heavy piece of wood at a construction site
b. trying to push a car that doesn’t move out of deep snow
c. pushing a child on a swing
d. holding a door shut on a windy day so it doesn’t blow open

A student who weighs 600N climbed the stairs from the second floor to the fourth floor, 20 meters above, in 60 seconds.
a. How much work did she do? b. What was her power?

How much force would you have to apply to a 15kg object in order to accelerate it a 2 m/s² ?

How much force would you have to apply to a 16kg box with in order to make it accelerate at 4m/s² ?

Calculate the force needed in each situation. The work required to do the job is the same in both situations. How much force do you have to apply in each situation to get the job done?

It takes 27N.m of work to push a crate up a ramp to a dock. The ramp is 3 meters long. How much force is necessary?

If you used a ramp that was 9 meters long how much force would you have to apply?