What is work defined as in physics?

• The amount of energy consumed by an object

• The transfer of energy to an object by using a force that causes the object to move in the direction of the force

• The distance an object travels

• The force applied on an object

Answer explanation

Work in physics is defined as the transfer of energy to an object by using a force that causes the object to move in the direction of the force.

Tags

NGSS.MS-PS3-5

How is work calculated?

• work = force + distance

• work = force / distance

• work = force x distance

• work = force - distance

Answer explanation

Work is calculated by multiplying the force applied to an object by the distance over which the force is applied, so the correct formula is work = force x distance.

Tags

NGSS.MS-PS3-5

What does the amount of work depend on?

• The amount of time the force is applied

• The speed of the object

• The amount of force and the distance in which the force is applied

• The weight of the object

Answer explanation

The amount of work depends on the amount of force and the distance in which the force is applied, as defined by the formula Work = Force x Distance.

For work to be done, in which direction must the force and distance be?

• In opposite directions

• In any random directions

• In the same direction

• Force and distance do not need to be in any specific direction

Answer explanation

Work is done when force and distance are in the same direction, as the force applied moves an object over a distance.

When carrying a box down the hall, why is work not being done?

• Because the force is horizontal and you are walking vertically

• Because the force and distance are in the same direction

• Because the force is vertical and you are walking horizontally

• Because no force is applied at all

Answer explanation

The correct answer is because the force is vertical and you are walking horizontally, which means no work is being done.

If you walk up the stairs with the box, why is work being done?

• Because the force and direction are both horizontal

• Because the force is horizontal and the direction is vertical

• Because the force and direction are unrelated

• Because the force and direction are both vertical

Answer explanation

The correct answer is because the force and direction are both vertical, indicating work is being done when walking up the stairs with the box.

Tags

NGSS.MS-PS2-4

NGSS.MS-PS3-2

What is an inclined plane?

• A vertical surface that connects two levels

• A slanting surface that connects a lower level to a higher level

• A flat surface that does not connect different levels

• A horizontal surface that supports an object

Answer explanation

An inclined plane is a slanting surface that connects a lower level to a higher level, allowing objects to be moved with less force.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

What does the steepness of an inclined plane determine?

• The weight of the object

• The distance the object must travel

• The effort that is needed

• The height of the inclined plane

Answer explanation

The steepness of an inclined plane determines the effort that is needed to move an object up or down the plane.

How does an inclined plane make work easier?

• By decreasing the distance

• By increasing the weight of the object

• By increasing the steepness

• By increasing the distance

Answer explanation

An inclined plane makes work easier by increasing the distance the object travels, reducing the amount of force needed to move it.

Tags

NGSS.MS-ETS1-1

Why does it take less force to move an object up an inclined plane?

• Because the object becomes lighter

• Because the inclined plane is always smooth

• Because the inclined plane supports the weight of the object

• Because the inclined plane is always horizontal

Answer explanation

The inclined plane supports the weight of the object, reducing the force needed to move it up.