Force, Mass and Motion

A student is pushing a box of books across the floor.   The student stops, removes some of the books, and then continues pushing the box across the floor.    Which best explains how removing some of the books affected the motion of the object?

• Removing some of the books reduced the mass of the box, and less force was needed to push it across the floor.
• Removing some of the books reduced the mass of the box, and more force was needed to push it across the floor.
• Removing some of the books did not affect the amount of force needed to push it across the floor.
• Removing some of the books decreased the mass of the box, and the same amount of force was needed to push it across the floor.

A student uses the same force to launch a golf ball, a ping pong ball, a bowling ball, and a baseball on a track.    Which object will move the fastest?

• The golf ball
• The ping pong ball
• The bowling ball
• The baseball

Four cars are at the starting line of a race.   Which car will require the most force to start moving?

• car with mass of 1200 kilograms
• car with mass of 1500 kilograms
• car with mass of 1700 kilograms
• car with mass of 2000 kilograms

Four different students take turns pushing a large, heavy ball on the school parking lot. What is the best way to determine which student used the most force to push the ball?

• compare the sizes of the students
• compare the ages of the students
• compare the distances that the ball rolled
• compare the number of times the ball was rolled

What can cause a moving object to increase its speed in a forward direction?

• a force pushing on the object from the opposite direction
• a force that continually acts on the object in the direction the object is moving
• an increase in the mass of the object
• a decrease in the mass of the object

Four solid balls, each with a different mass, are moving at the same speed. Which ball would require the most force to stop its motion?

• ball with a mass of 5 kg
• ball with a mass of 10 kg
• ball with a mass of 15 kg
• ball with a mass of 20 kg

Molly is trying to improve on hitting a softball. Which will most likely help to improve Molly’s hitting?

• a lighter ball and a lighter bat
• a heavier ball and a lighter bat
• a lighter ball and a heavier bat
• a heavier ball and a heavier bat

Wagon Q has a larger mass than Wagon T. If the wagons were pushed with the same amount of force across the same surface, which would most likely happen?

• Wagon Q would move farther than Wagon T.
• Wagon T would move farther than Wagon Q.
• Wagon T’s mass would increase as Wagon Q’s mass decreased.
• Wagon Q’s mass would increase as Wagon T’s mass decreased.

If these boys are pulling with the same amount of force.  What will happen?

• The boy in blue will win.
• They will not move at all.
• The boy in red will win.
• Both will fall down.

Something with a greater mass requires a(n) _____ force to move it. 

• greater
• lesser
• equal
• opposite