Work and Energy Quiz

In scientific terms, work is defined as:

• The amount of force applied to an object over a distance

• The amount of energy applied to an object

• The amount of heat generated by moving an object

• The amount of time taken to move an object

Answer explanation

Work is defined as the amount of force applied to an object over a distance.

How are work, force, and distance related?

• Work is directly proportional to force and inversely proportional to distance

• Work is directly proportional to distance and inversely proportional to force

• Work is directly proportional to force and distance

• Work is inversely proportional to force and distance

Answer explanation

Work is directly proportional to distance and inversely proportional to force. This means that as the distance increases, the work done also increases, while as the force increases, the work done decreases.

What are two different units that represent work?

• Watt and calorie

• Joule and Newton-meter

• Newton-meter and watt

• Pascal and ohm

Answer explanation

Joule and Newton-meter are two units that represent work. They are the correct choices because they are both derived from fundamental units of mass, length, and time.

Was work done when an ice skater glides for two meters across ice?

• Not enough information to determine

• No work done

• Work done only if the ice is rough

• Work done

Answer explanation

No work is done when an ice skater glides for two meters across ice because there is no force acting in the direction of motion.

How much work does a mother do if she lifts each of her twin babies upward 1 meter? Each baby weighs 90 newtons.

• 360 Joules

• 180 Joules

• 270 Joules

• 450 Joules

Answer explanation

The work done is equal to the force applied multiplied by the distance moved. Since the mother lifts each baby 1 meter, the work done is 90 newtons * 1 meter = 90 Joules. Therefore, the correct answer is 180 Joules.

You pull your sled through the snow a distance of 500 meters with a horizontal force of 200 newtons. How much work did you do?

• 10,000 Joules

• 25,000 Joules

• 100,000 Joules

• 50,000 Joules

Answer explanation

The work done is calculated by multiplying the force applied (200 N) by the distance traveled (500 m), resulting in 100,000 Joules. Therefore, the correct answer is 100,000 Joules.

How much work do you do when you pick up a 100-newton sled, lifting it 0.5 meter upward?

• 500 Joules

• 200 Joules

• 100 Joules

• 50 Joules

Answer explanation

When lifting the sled, you do work equal to the force applied multiplied by the distance moved. In this case, the work done is 100 Newtons multiplied by 0.5 meters, which equals 50 Joules. Therefore, the correct choice is 50 Joules.

An ant sits on the back of a mouse. The mouse carries the ant across the floor for a distance of 10 meters. Was there work done by the mouse?

• Work done only if the mouse is tired

• No work done

• Not enough information to determine

• Work done

Answer explanation

No work is done by the mouse as it carries the ant across the floor. The force applied by the mouse is perpendicular to the displacement, resulting in zero work.

You decide to add up all the work you did yesterday. If you accomplished 10,000 newton meters of work yesterday, how much work did you do in units of joules?

• 10,000 Joules

• 20,000 Joules

• 30,000 Joules

• 40,000 Joules

Answer explanation

To convert from newton meters to joules, we use the same unit. Therefore, the work done in joules is 10,000.

You did 150 joules of work lifting a 120-newton backpack. How high did you lift the backpack?

• 5.12 meters

• 1.28 meters

• 2.56 meters

• 3.84 meters

Answer explanation

The backpack was lifted to a height of 1.28 meters, as it required 150 joules of work to lift a 120-newton backpack.