Forces & Motion Post Assessment

First and Last Name

1. Which best represents the relationship between force and the mass of an object?

• A. The greater the force, the smaller the object.
• B. The smaller the force, the smaller the object.
• C. The force on an object determines what density it has.
• D. The greater the mass of an object, the greater the force needed to move it.

2. On which surface would a toy car travel the farthest if pushed with the same amount of force?

• A. ice
• B. grass
• C. carpet
• D. concrete

3. In order for someone to push a heavy box 10 meters across a floor, which must happen?

• A. The force of the person pushing must be greater than the force of friction.
• B. The force of the person pushing must be less than the force of friction.
• C. The force of the person pushing must be less than the force of gravity.
• D. The force of the person pushing must be greater than the force of gravity.

4. How would the absence of friction affect a marble traveling on a long, straight path?

• A. The marble’s speed would decrease.
• B. The marble’s speed would increase.
• C. The marble would stop immediately.
• D. The marble would remain at constant speed.

5. Two toy race cars are going to be raced down the same ramp. Which information is most helpful in predicting which car will win the race?

• A. length of the ramp
• B. volume of the cars
• C. slope of the ramp
• D. mass of the cars

6. Michael is using the balls below for an experiment. He kicks the two balls on a flat surface with the same amount of force and thinks the heavier ball will go farther. Is he correct?

• A. No, he is incorrect because the lighter ball has less mass, so it is affected more by gravity.
• B. Yes, he is correct because the heavier ball has more mass, so it is affected less by friction.
• C. No, he is incorrect because the lighter ball has less mass, so it will travel farther.
• D. Yes, he is correct because the heavier ball has more mass, so it will move farther.

7. Two students sit on a seesaw in a way that makes it balance and not move. When a third person pushes down on one side, that side moves down. What caused the seesaw to move?

• A. The effect of gravity increased when one side was pushed down.
• B. The friction between the two sides decreased because of the push.
• C. The total force increased on the side that was pushed down.
• D. The push on one side of the seesaw decreased the force on the other side.

8. How does the mass of an object affect acceleration?

• A. The greater the mass of an object, the greater the force needed to accelerate the object.
• B. The greater the mass of an object, the smaller the force needed to accelerate the object.
• C. The greater the mass of an object, the smaller the force need to decelerate the object.
• D. The smaller the mass of an object, the greater the force needed to decelerate the object.

9. What must be true for a baseball to be hit high into the air?

• A. The force striking the ball must be greater than the force of gravity.
• B. The force striking the ball must be less than the force of gravity.
• C. The force striking the ball must be equal to the force of gravity.
• D. The force striking the ball must be similar to the force of gravity.