## Get Guided Liberty University PHYS 101 Quiz 3

- When we say work is done against a force, we mean the force does
- Consider a situation where two moving objects collide, stick to each other, and move off together.
- Consider a situation where a constant force of 25 N acts on an object having a mass of 2 kg for 3 seconds.
- Consider a situation where two moving objects collide, stick to each other, and move off together.
- The energy of a ball rolling up an inclined plane
- You carry a 20-N box 5 m horizontally across a room. The work you do is
- About how many 100-W light bulbs would you have to light up to use energy at the rate of one horsepower?
- A kid slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J.
- Which of the following quantities are conserved in an isolated system?
- If a force on an object is aimed opposite the direction of the object’s velocity, the force does
- Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t.
- What does it mean for a physical quantity in a system to be conserved?
- Consider a situation where two moving objects collide, stick to each other, and move off together.
- The mass of 1 m 3 of fresh water is 1,000 kg. At the top of a hydroelectric dam the potential energy of the water is
- Consider a situation where two moving objects collide and rebound from each other.
- Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m.
- Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up.
- Consider a situation where two moving objects collide, stick to each other, and move off together.
- The energy of a body moving across a horizontal surface is an example of kinetic energy.
- Momentum is conserved only when there is no friction.
- Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m.
- The momentum of an object never changes.
- The energy stored in a pile driver is an example of gravitational potential
- Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m.
- A person runs up a long flight of stairs in 10 seconds. If the person’s weight is 600 N and the vertical height of the stairs is 20 meters, the person’s power output is 1,200 W.
- Select the closest matching pairs possible. 3 pts for each response.
- Write your name and date. This problem should be solved using the principles of Energy Conservation found in Chapter 3.

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