Which distance do you measure to determine how much work was done on an object that has been moved?

The distance moved in the direction of the force.

The distance from the starting point to the endpoint.

The vertical distance moved only.

The total distance traveled regardless of direction.

The simple machines shown in the diagrams as a moveable pulley, a pulley system, or a simple pulley

Moveable pulley, pulley system, simple pulley

Compare and contrast all three systems in terms of direction of force, amount of force, and the distance that the force is exerted among all three pulleys

System A requires 100 N of force over a short distance; System B requires 50 N of force over a longer distance; System C requires 50 N of force over an even longer distance, with a mechanical advantage of 2.

System A requires 100 N of force over a long distance; System B requires 50 N of force over a short distance; System C requires 50 N of force over a short distance, with a mechanical advantage of 3.

System A requires 50 N of force over a short distance; System B requires 100 N of force over a longer distance; System C requires 100 N of force over a short distance, with a mechanical advantage of 1.

System A requires 50 N of force over a long distance; System B requires 100 N of force over a short distance; System C requires 100 N of force over an even longer distance.

Explain how mechanical advantage is calculated for each pulley system.

Mechanical advantage for A and B is 1; for C it is 2.

Mechanical advantage for A is 1; for B it is 3; for C it is 4.

Mechanical advantage for A, B, and C is 1.5 each.

Mechanical advantage for A and B is 2; for C it is 1.

Which of the following does a simple machine do?

allows the users to apply less force over a longer distance

reduce the amount of force needed to do work

change the direction of the applied force

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

The force needed to move the object.

The pull of gravity on the object.

The amount of space the object occupies.

Distinguish between a machine that is efficient and a machine that is not efficient.

An efficient machine uses less energy and produces more output compared to a non-efficient machine, which wastes resources and produces less output.

An efficient machine operates at a slower speed than a non-efficient machine.

A non-efficient machine requires more maintenance than an efficient machine.

An efficient machine is larger and more complex than a non-efficient machine.

What will happen in this simulation?

The Jeep will get pushed down by the box.

Explain why some machines have a mechanical advantage that is greater than 1 and why others have a mechnical advantage that is less than 1.

Machines can have a mechanical advantage greater than 1 when they amplify force, while those with less than 1 require more force than the load they move.

Machines with a mechanical advantage greater than 1 always move loads faster.

All machines with a mechanical advantage less than 1 are inefficient.

Mechanical advantage is unrelated to the force applied by the machine.

Compare and contrast a compound machine with a simple machine.

A simple machine has one component, while a compound machine consists of multiple simple machines working together.

A simple machine is always larger than a compound machine.

A compound machine operates independently of simple machines.

A simple machine can only perform one type of task, while a compound machine can perform multiple tasks.

Explain how using a screwdriver makes it easy to pry open a can of paint.

A screwdriver makes it easy to pry open a can of paint by allowing you to apply force over a greater distance, using leverage to reduce the effort needed.

A screwdriver makes it harder to open the can by increasing the distance needed to pry.

Using a screwdriver requires no force, as it simply slides under the lid.

A screwdriver is used to hammer the can open, applying force directly.

Compare and contrast two situations- one in which work tranfers kinetic energy and one in which work transfers potential energy.

Work transfers kinetic energy when moving an object, and potential energy when lifting an object.

Work transfers kinetic energy when lifting an object. Potiential energy only when pushing.

Work transfers potential energy when moving an object. Kinetic energy when standing still.

Work transfers kinetic energy when compressing a spring. When potential energy is waiting to happen.

Choose an example of two situations in which the amount of work done is equal but the amount of power is different.

Lifting a weight quickly vs. lifting the same weight slowly.

Running a marathon vs. walking the same distance

Pushing a car uphill vs. pushing it downhill

Carrying a backpack vs. carrying a suitcase of the same weight

Chapter 3 TEST 8TH

Authored by Kathleen Smith

Science

8th Grade

NGSS covered

Used 11+ times

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MULTIPLE CHOICE QUESTION

5 sec • 1 pt

a simple machine made up of of a grooved wheel with a rope or cable wrapped around it.

Pulley

Wedge

Inclined Plane

Lever

MULTIPLE CHOICE QUESTION

5 sec • 1 pt

a flat, sloped surface

ramp

staircase

platform

hill

MULTIPLE CHOICE QUESTION

5 sec • 1 pt

3. the transfer of energy to an object by a force that makes an object move in the directions of the force.

Force

Energy

Work

Power

MULTIPLE CHOICE QUESTION

5 sec • 1 pt

the ratio of the output work to the input work

Output Ratio

Productivity

Efficiency

Effectiveness

MULTIPLE CHOICE QUESTION

5 sec • 1 pt

the rate at which work is done

Force

Power

Velocity

Energy

MULTIPLE CHOICE QUESTION

5 sec • 1 pt

a sloped surface that moves

Slide

Platform

Incline

Ramp

MULTIPLE CHOICE QUESTION

5 sec • 1 pt

an inclined plane wrapped around a cylinder

wedge

pulley

lever

screw

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Chapter 3 TEST 8TH

a simple machine made up of of a grooved wheel with a rope or cable wrapped around it.

a flat, sloped surface

3. the transfer of energy to an object by a force that makes an object move in the directions of the force.

the ratio of the output work to the input work

the rate at which work is done

a sloped surface that moves

an inclined plane wrapped around a cylinder

the ratio of the output force exetrted to the input force applied.

Which distance do you measure to determine how much work was done on an object that has been moved?

A rake makes doing work easier by changing the

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