3-1-24 ch 4 quiz

_______ is force applied through a distance.

• Effort

• Resistance

• Power

• Work

In which of the following situations do your arms do work on books?

• holding a heavy stack of books while standing

• carrying a heavy stack of books

• dropping a stack of books onto a table

• picking up a pile of books from the floor

Which of the following equations should be used to calculate work done?

• W = F × d

• W = F/d

• W = F × a

• W = m × d

You apply a force of 18 N to a dresser and move it 3.0 m. How much work did you do on the dresser?

• 54 J

• 6.0 J

• 21 J

• 27 J

A couch is pushed with a horizontal force of 80 N and moves a distance of 5 m across the floor. How much work is done in moving the couch? 

• 40 J

• 400 J

• 800 J

• 250 J

How much work do you do when you lift a 100 N child 0.5 m

• 100 J

• 200 J

• 50 J

• 400 J

The brakes on a car do 240,000 J of work in stopping the car. If the car travels a distance of 40 m while brakes are being applied, how large is the average force that the brakes exert on the car? 

• 9,600,000 J

• 9,600,000 N

• 6000 J

• 6000 N

The force needed to lift an object is equal in size to the gravitational force on the object. How much work is done in lifting an object that has a mass of 5 kg a vertical distance of 2 m. 

• 112 J

• 28 J

• 98 J

• 10 J

If an object is moved 2 m and has a total work performed on it of 25 J how many newtons of force were applied? 

• 100 N

• 50 N

• 480 N

• 12.5 N

If an object has 100 J of work done on it with a force of 25 N applied to it how far does the object move?  

• 1 m

• 2 m

• 3 m

• 4 m

• 5 m