WORK & POWER Part 2

When work is done on an object, a force is applied that is:

• opposite in direction of the applied force.

• moving in the same direction as the applied force.

• opposite in the direction of the mass.

• opposite in the direction of the weight

Which of the following is correct concerning W = F d?

• weight equals force times distance

• watts equals force times distance

• work equals force times distance

• work equals mass times distance

The more powerful a machine is, the:

• less the time it takes to do the given amount of work.

• the more time it takes to do the given amount of work.

A simple machine is:

• any device that makes work easier to do.

• can be classified as either a pulley, lever, inclined plane, wedge, screw, gear, or wheel and axle.

• a device that makes work harder to perform.

• a device that makes tasks simple by increasing the amount of effort needed to perform a task.

Tags

NGSS.MS-PS2-1

Which of the following is incorrect?

• Simple machines only deal with balanced forces.

• Simple machines redirect forces from one place to another.

• Simple machines increase the magnitude of a force

Which of the following basically mean the same thing?

• resistance, resistance force, load, weight

• mass, weight, resistance, load

• effort force, resistance force, load, mass

• effort force, resistance force, load, weight

Which of the following is correct?

• A simple machine overcomes resistance at one point of the machine by applying force at some other point.

• A simple machine overcomes resistance at one point of the machine by applying a load at some other point.

• A simple machine overcomes an effort force at one point of the machine by applying acceleration at some other point.

• A simple machine overcomes resistance at one point of the machine by applying acceleration at some other point.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

This force is used to do work.

• work force

• effort force

• load force

• resistant force

Work can be positive or negative based on the direction of the force involved.

• true

• false

• only when forces are balanced

• only when forces are unbalanced

Tags

NGSS.MS-PS3-5

For work to be done, motion has to:

• be positive

• be negative

• occur

• stop