Work Power Machines

if you push a cart with a force of 60 N for 2 m... how much work have you done

• 120 J

• 30 J

• 120 N

• 30 N

Which situation is work not done?

• lifting a 20 pound box off the floor
• holding a 20 pound box above the floor
• sliding a 20 pound box across the floor
• sliding a 20 pound box up an inclined plane

A machine with a 5-N input force and a 25-N output force has a mechanical advantage of?

• 2

• 5

• 20

• 125

The mechanical advantage of a pulley system depends upon?

• The diameter of the pulley wheels

• The length of the rope

• The number of sections of rope

• The direction of the input force

Tags

NGSS.MS-PS2-2

Which is not considered a simple machine?

• The pump

• The wheel & axle

• The wedge

• The screw

• The pulley

If the MA is 6 and the efficiency of the simple machine is 75% then what is the IMA?

• 6

• 9

• 8

• 4

A boy is pulling a box with a force of 80 N at an angle of 25º with the horizontal, what is the work-done id the displacement is 50 m?

• 3500 J

• 3625.23 J

• 3923.23 J

• 3122.78 J

A boy of mass 30 kg is running at a speed of 5 m/s. What is his Kinetic Energy?

• 400 J

• 425 J

• 350 J

• 375 J

The displacement of effort force d_e is 6 m and the displacement of resistance force dr is 2.5 m. What is the IMA?

• 2.4

• 3.6

• 1.2

• 5.0

Calculate the power, if the work done is 50 J and the time required to the work is 12.5 Sec

• 6 W

• 5 W

• 4 W

• 3 W