Science Quiz 3/11

Jana wants to carry two boxes of science supplies to the storage closet. The boxes are the same size. One box holds cotton balls. The other box holds glass beakers. Jana will do more work when she carries the beakers than when she carries the cotton balls. This is because ____.

• The beakers have more weight than the cotton balls, and more weight requires a greater force to move the box to the closet

• The cotton balls have more weight than the beakers, and more weight requires less force to move the box to the closet

• The beakers have less weight than the cotton balls, and less weight requires greater force to move the box to the closet

Penny pushed her pencil across the table to Addie. Did Penny do any work?

• No, because the pencil did not move.

• Yes, because the pencil moved over a distance.

• Yes, because Addie wanted to draw with the pencil.

Josh pulled hard on a wagon full of firewood, but the wagon did not move. Did Josh do any work?

• No, because the wagon did not move.

• Yes, because Josh pulled hard on the wagon.

• Yes, because the wagon was full of firewood.

Friction is a contact force that keeps people and objects from slipping and sliding.

• True

• False

An object with greater weight requires less force to move the object.

• True

• False

Gravity is measured by how much force it takes to move an object and how far the object moves.

• True

• False

You use energy to do work.

• True

• False

A hammer, a wheelbarrow, and a fishing pole are kinds of levers.

• True

• False

The weight of an object being moved by a simple machine is the effort.

• Effort

• Load

The force applied to cause a simple machine to do work is the load.

• Effort

• Load