Work and Machines Quiz

Imagine John pushed a heavy cart with a force of 400 newtons for a distance of 4 meters to get it moving out of a storage room and then let it slide for another meter into the hallway. How much work was done by John during this process?

• 1,200 joules

• 1,600 joules

• 2,000 joules

• 800 joules

Tags

NGSS.MS-PS3-5

In a pulley system, what will the pulleys do to the block and how will it affect the direction of the force?

• Increase; direction of the force remains the same

• Decrease; change

  the direction of the force

• Decrease; direction of the force remains the same

• Increase; change the direction of the force

How do simple machines make work easier?

• They increase the amount of work done

• They increase the amount of force needed

• They reduce the amount of force needed

• They have no effect on the amount of work done

How much work is done when a person uses a lever to lift a 20-kilogram box with 98 Newtons over a distance of 4 meters to lift the box a distance of 2 meters?

• 196 Joules

• 392 Joules

• 784 Joules

• 1,568 Joules

Tags

NGSS.MS-PS3-2

NGSS.MS-PS3-4

What is the purpose of using a lever when lifting a heavy box?

• To increase the weight of the box

• To reduce the force needed to lift the box and change the direction of the force

• To measure the weight of the box

• To lift the box without applying any force

Tags

NGSS.MS-ETS1-2

NGSS.MS-PS2-2

In which situation did the car achieve the greatest efficiency, assuming all cars have the same mass?

• A car that traveled 100 kilometers on 5.0 liters of gas

• A car that traveled 80 kilometers on 5.0 liters of gas

• A car that traveled 60 kilometers on 5.0 liters of gas

• A car that traveled 80 kilometers on 10 liters of gas

How does a pulley make work easier when it is used to lift an object?

• It increases the weight of the object

• It changes the direction of the lifting force to work against gravity

• It changes the direction of the lifting force to work with gravity

• It requires more force to lift the object

Tags

NGSS.MS-ETS1-1

What could make a lever system that is only 30% efficient more efficient?

• Use a more flexible lever to increase energy absorption

• Use a lever made of a heavier material

• Use a stiffer lever to reduce energy lost bending the lever

• Increase the load on the lever

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

When a person pushes a box with a force of 400 newtons for a distance of 4 meters and then the box slides forward another meter, how much work is done by the person?

• 200 joules

• 800 joules

• 1,200 joules

• 1,600 joules

Tags

NGSS.MS-PS2-2

How do simple machines make work easier?

• By increasing the amount of force needed

• By decreasing the amount of force needed

• By changing the type of work done

• By making work more difficult

Tags

NGSS.MS-ETS1-1