Question

A block of weight *w* = 25.0 N sits on a frictionless
inclined plane, which makes an angle *θ* = 20.0 ∘ with
respect to the horizontal, as shown in the figure. (Figure 1)A
force of magnitude *F* = 8.55 N , applied parallel to the
incline, is just sufficient to pull the block up the plane at
*constant speed*.

**Part B**

What is *W*g, the work done on the block by the force of
gravity *w*⃗ as the block moves a distance
*L* = 5.00 m up the incline?

Express your answer numerically in joules.

**Part C**

What is *W**F*, the work done on the block by the
applied force *F*⃗ as the block moves a distance
*L* = 5.00 m up the incline?

Express your answer numerically in joules.

**Part D**

What is *W**N*, the work done on the block by the
normal force as the block moves a distance *L* = 5.00 m up
the inclined plane?

Express your answer numerically in joules.

Answer #1

a) Work done by gravity

the angle between gravity force and displacement is

b) Work done by applied force is

the angle between applied force and displacement is 0

W = 42.75 J

c) Work done by the normal force

The angle between the normal force and the displacement is 90

W = 0

A block of weight w = 30.0 N sits on a frictionless inclined
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ANSWERS IN JOULES
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