m2 inclined plane introduction

Match the descriptions to the physical quantities.

• POWER

• A measure of the distance the push moved the object

• FORCE

• A measure of an object's capacity to do work

• RATE

• A measure of how quickly the push moved the object over the distance

• WORK

• A measure of the magnitude of the push

• ENERGY

• Any quantity that measures change over time (x/t)

Which of the following equations are INCORRECT? (Pick more than 1 less than 3)

• Work = Force x Distance

• Force = Work x Distance

• Distance = Work / Force

• Distance / Force = Work

Which unit is typically used to measure both work and energy?

(a)  

A sledge is pushed up a hill with a force, F. The work done on the sledge depends on the force applied and on a distance moved. Which distance?

• x

• y

• z

• x + z

Put these inclined planes in order of most easy to use (1 = least effort required) to least easy to use ( 3 = most effort required)?

• 
• 
• 

Which of the following is a true statement about an ideal inclined plane? (ideal means it does not waste energy/work)

• An inclined plane reduces the amount of work one needs to do

• An inclined plane increases the amount of work one needs to do

• An inclined plane makes work require more effort

• An inclined plane makes work require less effort

In physics, what is work?

• The effort exerted over a certain amount of time.

• The force required to make an object accelerate.

• The effort exerted over a certain distance.

• The force required to make a moving object stop.

Which of these activities would require the least effort to lift an object vertically?

• Walking up a short ramp with a steep incline.

• Walking up a long ramp with a steep incline.

• Walking up a long ramp with a slight incline.

• Bypassing the ramp and jumping directly onto a platform.

When you carry a heavy box up a ramp, instead of lifting it directly onto a platform:

• The amount of work you have to do increases slightly

• The amount of work you have to do decreases slightly

• The amount of work you have to do decreases significantly

• The amount of work you have to do stays the same

Approximately how much work is required to slide a 50 kg load up this ramp? Hint: you need to convert mass into weight (W = mg)

• 125 J

• 150 J

• 300 J

• 1500 J