Unit 7 Science Review Forces and Motion

Aiden wants to find out the average distance that each of his 7 friends can roll a ball.  He asks 7 friends that are the same size to roll a ball from the same starting point.  He notices that one friend rolls the ball much farther.  He wants his data to be accurate.  What should he do?

• Repeat the experiment with the person that had the unusual result.
• Repeat the experiment two more times, and find averages for each of the throwers.
• Repeat the experiment using a different friend as a replacement.
• Repeat the experiment and ignore the results of the first experiment.

Which ball requires the most force and why?  Bowling, Soccer, Baseball, or Volleyball

• The baseball, because it has less mass.
• The soccer ball, because it has the most air.
• The bowling ball, because it has the most mass.
• The volleyball, because its soft. 

What surface has the greatest amount of friction?

• Thick carpet
• Wet ice
• Glass Mirror
• Waxed wood

If you have two items that you are pushing or the same distance; one item has more mass than the other.  What must you do to get the item with more mass to move the same amount as the item with less mass?

• Push the item with less force.
• Push the item with more force.
• Push the item with the same amount of force.
• Add more mass and push it with the same amount of force.

A spring scale measures force.  When measuring the force of 1 toy the force was 1.1N.  What would be the force if you added a second identical toy?

• 1.1N
• 4.4N
• 3.3N
• 2.2N

If a boulder is sitting at the side of a mountain, and it's balanced.  Then a soft push is applied to the boulder and it moves.  How can a small force cause a large mass to move?

• The direction of the force is important to make an object move, but the amount of force is not.
• The push on the rock increased the amount of friction, so the rock moved.
• The small push balanced the forces that were keeping the rock in place and caused it to move.
• The forces on the rock were balanced, and a small additional force caused them to be unbalanced.

One day Joann measured a stapler using a spring scale.  The next day she measured the same stapler, again using a spring scale.  How should the results compare?

• The results should be the same, because the mass and force of gravity are the same.
• The results should be the same, because friction stayed the same.
• The results should be different,  because it was measured on different days.
• The results should differ, because gravity changes.

What force causes a ball that is thrown up to fall down?

• Friction
• Motion
• Gravity
• Wind

A spring scale measures...

• Gravitational Force
• Motion
• Unbalanced Forces
• Velocity

When you push a piece of furniture, which direction is the force of friction being exerted?

• Upward
• Downward
• The same direction you are pushing.
• The opposite direction you are pushing.