Oscar uses a pulley to lift his car 5 meters, he uses a force of 935 N. How much work has Oscar done?

• 78 joules

• 4,675 joules

• 2,437 joules

• 253 joules

Adrian uses a pulley with 1 rope to lift a box. He applies a force of 126 N, the resistance force is also 126 N. If he adds another rope to his pulley, how much force does he need to apply this time?

• 504 N

• 2 N

• 252 N

• 63 N

Tags

NGSS.MS-PS2-2

A pulley is being used to lift boxes. It has a mechanical advantage of 7 and a resistance force of 2478 N. What is the effort force exerted on the pulley?

• 408 N

• 354 N

• 20 N

• 87.7 N

Tags

NGSS.MS-PS2-2

Haley lifts a dumbbell up 1 meter, Evan lifts the same dumbbell up 2 meters with a pulley with 2 ropes. Evan is exerting half the amount of force of Haley. Who has done the most work?

• Evan

• Haley

• They have done the same amount of work

Elliot has done 1788 joules of work, he exerted 223.5 N of force on a pulley to lift a $1,000 in quarters . How many meters did Elliot lift the quarters?

• 24 meters

• 8 meters

• 47 meters

• 62 meters

The pulley system on the left shows a block weighing 75 N connected to one string and another block weighing 100 N connected to the other string. The pulley system on the right is identical except the 100 N block is replaced by a force of 100 N downward.

Initially the systems are at rest but because of the imbalance of forces, the 75 N blocks on both systems move upward and eventually reach the top of the pulley.

Which 75 N block hits the pulley first?

• The system on the left.

• The system on the right.

• Both systems hit at the same time.

Tags

NGSS.MS-PS2-4