Inclined Planes, Pulleys and Speed

In which situation will the pulley reduce the force needed to lift the load?

• A
• B
• C
• D

Students pulled the same mass up an inclined plane that was 20 cm, 30 cm, and 40 cm long. Each time, they used a spring scale to measure the force needed to pull the mass up the inclined plane. What did they conclude?

• Less force was needed on the 20 cm plane
• More force was needed on the 40 cm inclined plane.
• The least amount of force was needed on the 40 cm inclined plane.
• The least amount of force was needed on the 30 cm inclined plane.

Tags

NGSS.MS-PS2-2

An inclined plane reduces the amount of force needed to move an object by - 

• increasing the distance the object moves.
• transferring more of the force to the object
• reversing the direction the object is moved.

Tags

NGSS.MS-PS2-2

Which of the following decreases when an object is moved using an inclined plane?

• The distance the object moves.
• The pull of gravity on the object.
• The force needed to move the object.
• The amount of space the object occupies.

Tags

NGSS.MS-PS2-2

What is a disadvantage of using an inclined plane to lift a heavy object?

• The object must be moved a greater distance.
• It takes less effort to move the object.
• Many objects are difficult to lift straight up.
• Heavy object usually take up more space.

The picture shows a 150 N load being lifted using a fixed pulley. Which force could lift the load?

• 50 N
• 75 N
• 175 N

How much force would be needed to lift the 150 N weight? Remember, you need to divide the original force by the number of pulleys.

• 300 N
• 150 N
• 75 N
• 25 N

The table shows the force needed to lift an object with different numbers of pulleys. How much force would you need when you use 4 pulleys?

• 100 N
• 75 N
• 50 N
• 25 N

A fixed pulley does not reduce the force needed to lift an object. What, then, is the advantage of using a fixed pulley?

• A fixed pulley reduces the force.
• A fixed pulley changes the direction of the force.
• A fixed pulley does not have any advantages.

A box rests motionless on the ground. One student is pushing the box to the right with a force of 2 Newtons. The other student is pushing to the left with a force of 5 Newtons. In which direction will the box move?

• Right
• Left
• No movement