What does the power of a machine measure?

The force the machine produces.

The total amount of work completed.

How are the particles in a block of iron affected when the block is melted?

The particles move more rapidly.

The particles contain less energy.

The particles increase in volume.

Which of the following best describes what a thermometer measures?

average kinetic energy of a substance’s molecules

amount of heat energy contained in a substance

rate of flow of heat from a substance to the environment

the melting point and boiling point of a substance

A glass of water left in the sun becomes warm. Estella adds ice to the water to make it cool. What energy change occurs when ice is added to the warm drink?

The water loses heat to the ice, causing the ice to melt.

The water absorbs the cold temperature from the ice.

Since the ice is cold, it adds cold to the environment.

The melting ice causes the water to expand, cooling it.

José is investigating the relationship between energy and the motion of an object. José releases a ball onto a U-shaped ramp and observes the motion of the ball as it rolls back and forth between sides 1 and 2. Which explains the total energy of the ball on the ramp?

The ball loses kinetic energy and gains potential energy when rolling upward.

The ball loses potential energy and absorbs thermal energy when rolling upward.

The ball gains potential energy and absorbs thermal energy when rolling downward.

The ball loses kinetic energy and loses potential energy when rolling downward.

The kinetic energies of particles in a sample of matter are increasing. This sample is most likely

a liquid that is turning into a solid.

a gas that is turning into a liquid.

Which of the water samples described below has the greatest average kinetic energy per molecule?

1 liter of water at a temperature of 75°C

1 liter of ice at a temperature of –50°C

10 liters of ice at a temperature of –75°C

10 liters of water at a temperature of 50°C

Emily is riding her bicycle. Which best explains why only some of the energy used to pedal her bicycle is transferred into forward motion of the bicycle?

The gears and chain of the bicycle generate friction.

The energy of the bicycle tire is applied in a circular motion.

The energy of the bicycle is transferred to only one wheel.

The gears and chain of the bicycle are covered with oil.

A bicyclist at the top of a hill begins to coast without pedaling. The bicycle speeds up as it descends to the bottom of the hill and then slows down as it continues up a second hill, where it stops. Which of these sequences best describes the energy change of the bicycle from the top of the hill until it stops?

potential — kinetic — potential

potential — kinetic — kinetic

kinetic — potential — potential

kinetic — potential — kinetic

A basketball bounces on the gym floor nine times and finally comes to a rest. Which of these best explains why the basketball rises to a lower height each time it bounces?

Energy is transferred from the basketball to the floor.

Gravity increases as the basketball bounces.

The floor adds energy to the bouncing basketball.

The air inside the basketball is heavier than the surrounding air.

When one form of energy is converted into other forms of energy, the total amount of energy

remains constant throughout the conversion.

varies throughout the conversion.

increases because some energy is created.

decreases because some energy is destroyed.

Energy, Work & Simple Machines

Authored by Tholeathcus Raiford

Physics, Other Sciences

10th - 11th Grade

Used 54+ times

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35 questions

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MULTIPLE CHOICE QUESTION

45 sec • 1 pt

A force of 12 N is used to lift a box 0.5 meters above a floor. What amount of work was done to lift the box?

6.0 N/m

11.5 N

12.5 N

24.0 N/m

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

How much work is done in moving the cart?

20J

500J

1000 J

2000 J

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

How much power is required to lift a 2.0 kg object 5 meters in 4.50 seconds?

0.45 Watts

2.22 Watts

21.8 Watts

45.0 Watts

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The efficiency of a machine is always less than 100 percent because

a machine cannot have an IMA greater than 1.

some work input is lost to friction.

the work input is too small.

the work output is too great.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

If you know the input distance and output distance of a machine, which of the following can you calculate?

work

efficiency

actual mechanical advantage

ideal mechanical advantage

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

An inclined plane reduces the effort force by

increasing the distance through which the force is applied.

increasing the work.

reducing the effort distance.

reducing the work.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

The ideal mechanical advantage of a pulley system is equal to the

distance the load has to move.

length of the rope.

number of rope segments supporting the load.

weight of the object being lifted.

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Energy, Work & Simple Machines

A force of 12 N is used to lift a box 0.5 meters above a floor. What amount of work was done to lift the box?

How much work is done in moving the cart?

How much power is required to lift a 2.0 kg object 5 meters in 4.50 seconds?

The efficiency of a machine is always less than 100 percent because

If you know the input distance and output distance of a machine, which of the following can you calculate?

An inclined plane reduces the effort force by

The ideal mechanical advantage of a pulley system is equal to the

Which of the following is not a type of simple machine?

What does the power of a machine measure?

Which class of lever best describes the machine shown:

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