Simple Machines and Balanced/Unbalanced Forces Review

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1. This simple machine is made up of one slanted surface.

• Pulley
• Wedge
• Inclined Plane
• Gravity

2. This simple machine is made up of a stiff bar that moves freely around a fixed point.

• Lever
• Wedge
• Motion
• Wheel and Axle

3. A simple machine made up of two cylinders that turn on the same axis is a:

• Lever
• Inclined Plane
• Screw
• Wheel and Axle

4. A simple machine made up of an inclined plane wrapped around a column is a:

• Screw
• Lever
• Pulley
• Gravity

5. A simple machine made up of two inclined planes is a:

• Motion
• Wedge
• Inclined Plane
• Lever

6. A simple machine that uses a wheel and a rope to lift a load is a:

• Wheel and Axle
• Screw
• Lever
• Pulley

7. Carlos learned that objects in motion will stay in motion. When he hit a baseball he noticed that the ball did not stay in motion, and it stopped rolling on the ground. What argument BEST explains why the ball stopped moving?

• He did not hit the ball high enough, so it eventually stopped moving.
• He did not hit the ball hard enough, so it eventually stopped moving.
• The forces of gravity and friction became balanced with the force of motion of the ball.
• The forces of gravity and friction became unbalanced with the force of motion of the ball.

8. Samantha rolled a basketball across the gym floor, and it traveled 100 feet. She rolled the same basketball with the same force across the grass on the playground, and it only traveled 45 feet. Which answer BEST explains her results of her investigation?

• The temperature on the playground was higher, which made the ball roll faster.
• The temperature in the gym was higher, which made the ball roll faster.
• The amount of friction on the gym floor was less, so the ball rolled farther.
• The amount of friction on the grass was less, so the ball rolled farther.

9. Forces that cause a change in the motion of an object:

• balanced force
• motion
• gravity
• unbalanced force