Simple machines and forces Test 8

Friction is beneficial because it ________.

• pulls your bicycle wheels towards the earth's center

• is what keeps a basketball player from slipping and sliding on the court

• help's a farmer's seed fall onto the soil

A change in position is _____

• motion

• work

• gravity

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

• energy

• gravity

• work

Two students are asked by their teacher to push two boxes of gym equipment to the storage closet. The boxes are the same size. One box holds 8 basketballs. The other box holds 2 basketballs. The student pushing the box of 8 basketballs will do more work than the student who is pushing the box with 2 basketballs. This is because _____.

• the 8 basketballs have MORE weight, and more weight requires greater force to move the box to the closet

• the 8 basketballs have LESS weight, and less weight requires less force to move the box to the closet

• the 2 basketballs have LESS weight, and less weight requires GREATER force to move the box to the closet.

Tags

NGSS.MS-PS2-2

Mark ran into the outfield to catch the baseball. Did Mark do any work?

• No, Mark did not do work because playing baseball is fun for him.

• No, Mark did not do work because the ball was caught by another player.

• Yes, Mark did work because he moved over a distance.

A bar that turns on a point is called ____.

• A wedge

• an inclined plane

• a lever

A wheelbarrow and rake are examples of _____.

• an inclined plane

• a lever

• a pulley

When the wheel of a wheel and axel turns one time, the wheel _______

• travels a shorter distance than the axel does

• travels a greater distance than the axel does

• does not travel at all

The axel in a wheel and axel turns with greater force than the wheel does, and the axel moves ______.

• a greater distance

• less distance

• the same distance

A simple machine is made of a wheel with a groove that holds a rope is _____.

• an inclined plane

• a pulley

• a wedge

Tags

NGSS.MS-PS2-1