No Knowledge Points Yet
Knowledge points for this tag are currently being developed.
Browse Problems
37 problems tagged with work-energy
P0533
Beginner Mechanics › Work and EnergyWork Done by Position-Dependent Forces
We move a particle along an x axis, first outward from $x = 1.0$ m to $x = 4.0$ m and then back to $x = 1.0$ m, while an external force acts on it. That force is directed along the x axis, and its x component can have different values for the outward trip and for the return trip. Here are the values (in newtons) for four situations, where x is in meters:
Outward / Inward (a) +3.0 / -3.0 (b) +5.0 / +5.0 (c) +2.0x / -2.0x (d) +3.0x^2 / +3.0x^2
[QUESTIONS] [Q(a-d)] Find the net work done on the particle by the external force for the round trip for each of the four situations. [Q(e)] For which, if any, is the external force conservative? [/QUESTIONS]
P0447
Beginner Mechanics › Work and EnergyWork and Friction for a Block Pulled at an Angle
A block of mass $m$ on a horizontal surface is pulled by a force $F$ at an angle $\theta$ above the horizontal. The block moves a distance $d$ at a constant velocity.
- How many forces are acting on the block?
- Find the work done on the block by each force and the work done by the net force.
- Find the coefficient of kinetic friction $\mu_k$ between the block and the surface.
P0448
Beginner Mechanics › Work and EnergyWork Done by Angled Force on Horizontal Surface
A person pushes an object with a mass of $m = 3.0$ kg at a constant velocity for a distance of $s = 10$ m across a horizontal floor. The pushing force is directed downwards at an angle of $\theta = 30^\circ$ relative to the displacement. The coefficient of kinetic friction between the object and the floor is $\mu = 0.20$.
P0449
Beginner Mechanics › Work and EnergyWork on a Box Pushed Up an Incline
A horizontal force $F$ is used to push a wooden box of mass $m=50$ kg at a constant velocity up an inclined plane. The plane is inclined at $\theta = 30^\circ$ and the box is pushed for a distance of $s=6.0$ m. The coefficient of kinetic friction between the box and the plane is $\mu = 0.20$.
- Find the work done by the pushing force ($W_F$).
- Find the work done by the frictional force ($W_f$).
- Find the work done by the normal force ($W_N$).
- Find the work done by gravity ($W_G$).
- Find the work done by the net force ($W_{net}$).
P0450
Beginner Mechanics › Work and EnergyWork Sign from a Velocity-Time Graph
Under the action of a single variable force, an object undergoes linear motion. Its velocity-time graph is shown in the figure.
P0543
Beginner Mechanics › Work and EnergyKinetic Energy Change on a Frictionless Incline
A block slides a distance $d$ down a frictionless ramp inclined at an angle $\theta$. A rope pulls on the block with a constant force of magnitude $F_r$ directed up the ramp. During this displacement, the block's kinetic energy increases by $\Delta K$.
P0544
Beginner Mechanics › Work and EnergyWork and Energy on a Frictionless Ramp
A book of mass $m$ is pushed by a constant horizontal force $\vec{F_a}$ as it slides a distance $d$ up a frictionless ramp inclined at an angle $\theta$.
- Calculate the work done on the book by the applied force ($W_a$), the gravitational force ($W_g$), the normal force ($W_N$), and the net work ($W_{net}$).
- If the book starts with zero initial kinetic energy, what is its speed $v_f$ at the end of the displacement?
P0545
Beginner Mechanics › Work and EnergyWork and Apparent Weight in an Elevator
A block of cheese of mass $m$ lies on the floor of an elevator cab of mass $M$. The cab is pulled upward by a cable.
- Through a distance $d_1$, the normal force on the block from the floor has a constant magnitude $F_{N1}$. How much work $W_{c1}$ is done on the cab by the force from the cable?
- Through a distance $d_2$, the work done on the cab by the constant force from the cable is $W_{c2}$. What is the magnitude of the normal force $F_{N2}$ on the block?
P0546
Beginner Mechanics › Work and EnergyWork-Energy for a Block Pulled on a Spring
A block lies on a horizontal frictionless surface, attached to a spring with spring constant $k$. Initially, the spring is at its relaxed length and the block is stationary at position $x=0$. Then, a constant applied force of magnitude $F$ pulls the block in the positive $x$ direction, stretching the spring until the block momentarily stops.
- What is the position of the block when it stops?
- What is the work done on the block by the applied force?
- What is the work done on the block by the spring force?
- At what position is the block's kinetic energy maximum?
- What is the value of the maximum kinetic energy?
P0547
Beginner Mechanics › Work and EnergyWork-Energy Theorem with Angled Tension
A cart on a frictionless horizontal rail is pulled by a cord that passes over a pulley. The pulley is at a fixed height $h$ above the rail. The cart moves from an initial position $x_1$ to a final position $x_2$. During the move, the tension $T$ in the cord is constant.
Practice by Difficulty
Practice all Work-Energy problems by difficulty level
Problem Sets
No problem sets available for Work-Energy.