Physics Lesson 13

Pataasin ang iyong marka sa homework at exams ngayon gamit ang Quizwiz!

A 2.74 g coin, which has zero potential energy at the surface, is dropped into a 12.2 m well. After the coin comes to a stop in the mud, what is its potential energy with respect to the surface?

-.328 J

How high would a 0.5-kg pendulum have to swing in order to have a potential energy of 2.3 J? (Assume a gravitational acceleration of 9.8 m/s/s.)

.47 M

What is the kinetic energy of a 0.135 kg baseball thrown at 40.0 m/s?

108 J

What is the potential energy of a 150-kg rock perched on a 10. m high cliff? (Use 9.8 m/s/s as the gravitational acceleration.)

15000 J

A 0.5 kg pendulum at the bottom of its swing is going 3 m/s. What is its kinetic energy?

2.3 J

An Olympic curler delivers a stone with an initial speed of 4.4 m/s. The stone has a mass of 20.0 kg. The coefficient of friction between the stone and the ice is 0.030. Assume the acceleration of gravity is 9.81 m/s/s. What is the distance that the stone will travel before it comes to a complete stop?

32 M

A 20-kg cart rolling down a ramp at 2 meters per second has ____ joules of kinetic energy.

40

In women's fastpitch softball, the pitcher throws the ball at 30.0 m/s. The ball has a mass of 1.08 kg. What is the kinetic energy of the softball?

486 J

Ball A has triple the mass and speed of Ball B. What is the ratio of the kinetic energy of Ball A to Ball B?

9

What is the gravitational potential energy of a 1.0 kg mass 1.0 m above the ground?

9.8 J

As you may recall, momentum (p) is computed as the product of mass and velocity (mv). Using your knowledge of algebra, answer the following question: Which equation correctly defines kinetic energy in terms of momentum? (Recall that KE = 0.5mv2)

KE=0.5pv

The equation for kinetic energy:

KE=1/2mv^2

Objects in motion have?

Kinetic Energy because of mass and speed.

A free-falling skydiver is converting gravitational potential energy into the kinetic energy of motion.

True

Which of the following is a valid way to determine the spring constant, k?

With a position of known potential energy, measure the distance away from relaxed, and calculate.

Gravitational potential energy is always measured in relation to

a zero level

spring constant

an expression of the ratio of force to displacement for a spring or other elastic material

Which of the following is NOT involved in the flight of a tennis ball during a tennis match?

chemical potential energy

Two cars of equal mass, moving at different speeds along a road, will have

different kinetic energy

A pocket watch contains a long, spiral piece of metal which is coiled tightly as the watch is wound. What form of potential energy is involved in winding a pocket watch?

elastic potential energy

The energy of movement, which is calculated by 0.5mv2, is

kinetic energy

The main difference between kinetic and potential energy is that

kinetic energy involves motion, and potential energy involves position.

A k value of 110 for a spring indicates that the spring would require _____force to stretch than for a spring with a k value of 66.

more

The stress that builds up along a fault line is a form of

potential energy

The terms, 0.5mvf2 - 0.5mvfi2, are the same thing as

the change in kinetic energy

The work-kinetic energy theorem states that the total work done on an object is equal to

the change in kinetic energy of the object

elastic potential energy

the energy available for use when an elastic body returns to its original configuration

Kinetic Energy

the energy of an object that is due to the object's motion

potential energy

the energy that an object has because of the position, shape, or condition of the object

When a hammer strikes a nail, the work done on the hammer contains a negative sign, indicating that

the hammer loses kinetic energy

If friction is the only force acting on an object during a given physical process, which of the following assumptions can be made in regard to the object's kinetic energy?

the kinetic energy decreases

gravitational potential energy

the potential energy stored in the gravitational fields of interacting bodies

The potential energy of a position of a spring depends on two factors,

the springs constant and the distance away from the relaxed position of the spring

work-kinetic energy theorem

the theorem that states that the change in kinetic energy of a moving particle is equal to the work done by all of the forces acting on the particle


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