Worksheet - Velocity & Speed
1. A student pulls a box 5.0 meters across a horizontal surface at a constant speed of 4.0 meters per second using a force of 60 newtons.
a. Calculate the amount of work done by the student.
[300 J]
b. What type of energy is being produced by the work done by the student?
1) kinetic energy only
2) potential energy and kinetic energy
3) internal energy and kinetic energy
4) internal energy only
[4 – Explain why!]
2. A 5.0 kilogram object is dropped from a height of 3.0 meters and hits the ground with a speed of 4.5 meters per second. Determine the amount of work done by friction as the object falls to the ground.
[97 J]
3. A 0.10 newton spring toy with a spring constant of 160 newtons per meter is compressed 0.05 meter before it is launched. When released the spring toy pops up and reaches a maximum height of 1.5 meters.
a. How much elastic potential energy is initially stored in the spring?
[0.2 J]
b. How much internal energy is produced as the toy springs up to its maximum height?
[0.05 J]
4. A constant force is used to speed up a block sliding along a rough, horizontal track. As the block slides there could be an increase in its
1) gravitational potential energy only
2) internal energy only
3) gravitational potential energy and kinetic energy
4) kinetic energy and internal energy
Proof: Explain your reasoning.
5. A 72 newton block is raised 5.0 meters while 500 joules of work are done. Approximately what amount of work was done in overcoming friction as the block was raised?
1) 140 J (3) 400 J
2) 360 J (4) 760 J
Proof: Show calculations.
6. A force of 3 newtons moves a 10 kilogram mass horizontally a distance of 3 meters. The mass does not slow down or speed up as it moves. Which of the following must be true?
1) 9 joules of kinetic energy were produced
2) 9 joules of gravitational potential energy were produced
3) 9 joules of heat energy were produced
4) 9 joules of kinetic energy and heat were produced
Proof: Explain your reasoning.
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