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Chapter Test Mechanical Energy

Last updated over 3 years ago
31 questions
2

In physics, work is defined as

2

If you lift two loads up one story, how much work do you do compared to lifting just one load up one story?

2

If Nellie Newton pushes an object with twice the force for twice the distance, she does

2

The unit of work is the

2

Power is defined as the

2

The unit of power is the

2

Potential energy is the energy an object has because of its

2

Kinetic energy of an object is equal to

2

An arrow in a bow has 80 J of potential energy. Assuming no loss of energy to heat, how much kinetic energy will it have after it has been shot?

2

Energy is changed from one form to another with no net loss or gain.

2

As a pendulum swings back and forth

2

When a car’s speed triples, its kinetic energy

2

Rockets are launched from an airplane in the forward direction of motion. The kinetic energy of the airplane will be

2

A woman can lift barrels a vertical distance of 1meter or can roll them up a 2-meter long ramp to the same elevation. If she uses the ramp, the applied force required is

2

A job is done slowly, and an identical job is done quickly. Both jobs require the same amount of work but different amounts of

2

An object that has kinetic energy must be

2

Which requires more work: lifting a 40-kg sack vertically 5 meters or lifting a 20-kg sack vertically 10 meters?

2

Which has greater kinetic energy, a car traveling at 35 km/h or a half-as-massive car traveling at 70 km/h?

2

An object at rest may have

2

A heavy object and a light object are released from rest at the same height and time in a vacuum. As they fall, they have equal

2

Mechanical energy can be in the form of

5

Your car runs out of gas and you get out and push it. If you apply a force of 1030 N for 327 m (the distance to the nearest gas station), how much work did you do to push it?

5

What amount of work can a 600.-W do in 3.00 minutes?

5

A 25.0-kg girl climbs up a tree branch 3.0 m higher in 6.00 seconds. What is her power output?

5

The 2.0-kg head of an ax is moving at 3.0 m/s when it strikes a log and penetrates 0.030 m into the log. What is the average force the blade exerts on the log?

5

Casey and Ryan, pretending that they are playing in the jungle, suspend a rope from an overhead tree limb. Casey, of mass, 39.6 kg, runs horizontally at 8.09 m/s along the flat ground, grabs the rope, and swings off the level ground.
(a) How high does Casey get above the ground in his swing?

5

Casey and Ryan, pretending that they are playing in the jungle, suspend a rope from an overhead tree limb. Casey, of mass, 39.6 kg, runs horizontally at 8.09 m/s along the flat ground, grabs the rope, and swings off the level ground.
(b) Ryan, who is 26.6 kg, gives it a try and reaches a height of 3.13 meters above the ground? How fast was Ryan running to achieve this height?

5

EXTRA CREDIT: The coyote, whose mass is 24.62 kg, is chasing the roadrunner when the coyote accidentally runs off the edge of a cliff and plummets to the ground 89.7 m below. What force does the ground exert on the coyote as he makes a coyote-shaped dent 0.695 m deep in the ground?

5

A 37.06 kg hammer of a pile driver is lifted 16.8 m .
a) Find the potential energy of the driver at its maximum height.

5

A 37.06 kg hammer of a pile driver is lifted 16.8 m .
b) Calculate the velocity of the driver as it hits the ground when dropped from 16.8 m using the Work-Energy Theorem.

5

EXTRA CREDIT: A child is on a swing. Her mom pushes her to a height of 2.21 m above the starting position. Determine the child's maximum velocity during the swing.