D

The location of an object.

• Speed
• Position
• Friction
• Gravity

Which word describes a push or pull on an object?

• Position
• Hypothesis
• Mass
• Force

A polar bear slides down an ice covered hill. As he slides, he slows down. Eventually he comes to a stop. What force  acts on an object to slow or stop its motion?

• Speed
• Friction
• Gravity
• Direction

Which experiment listed below will best determine how friction affects the speed of a rolling object?

• Roll 3 objects of various sizes across the floor.
• Roll 3 objects of equal size from various heights across the floor.
• Roll 3 objects of equal size across 3 different types of surfaces.
• Roll 3 objects of equal size from equal heights across the floor.

When designing an experiment, why is it important to test only one variable?

• Testing one variable explains what  caused the change once data has been gathered.
• Testing one variable collects inaccurate data and repeats the investigation more than necessary.
• Testing one variable decreases the reliability of the investigation.
• It is not necessary to test only one variable.

Looking at the picture, what two tools would be needed to measure the effect of friction on the ball?

• Hand lens and balance
• Balance and spring scale
• Measuring tape and stop watch
• Spring scale and hand lens

When conducting an experiment, in order to get reliable results, it is important to:

• Disregard results that do not match your hypothesis
• Test many different variables at the same time
• Test all forces at the same time
• Repeat the investigation several times

A student drops a ball from shoulder height. The ball bounces 5 times before coming to a stop. What force causes the ball to fall to the ground?

• Friction
• Magnetism
• Position
• Gravity

A boy applies a pushing force on a ball thrown into the air. What applies a pulling force on the ball at the same time?

• Gravity
• The height of the boy
• Friction
• The mass of the ball

Which experiment listed below will best determine how friction affects the speed of a rolling object?

• Roll 3 objects of various sizes across the floor.
• Roll 3 objects of equal size from various heights across the floor.
• Roll 3 objects of equal size across 3 different types of surfaces.
• Roll 3 objects of equal size from equal heights across the floor.