Experimenting with forces

“Ball C" is rolling across the surface, but it eventually comes to a stop. Which force is most likely responsible for this?

• gravity
• friction
• electricity
• magnetism

Tags

NGSS.MS-PS2-2

An identical object was placed onto the three different surfaces and set into motion with an identical force. The bars show how long it took the object to travel 10 meters. Based on the graph, which surface had the greatest friction?

• surface A
• Surface B
• Surface C
• Friction is the same on every surface

If the forces are the same in Scenario A and Scenario C, which ball would move the fastest?

• both balls would move at the same speed
• there is no way to determine which ball would move the fastest
• the ball in Scenario C
• the ball in Scenario A

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

The rougher the surface, the faster an object will travel over the surface.

• True
• False

A control in an experiment is - 

• the substance, object or group in an experiment that is not changed
• an experiment in which all variables are kept the same except one
• a push or pull
• a condition in an experiment that is changed

A variable in a science experiment is - 

• the substance, object or group in an experiment that is not changed
• an experiment in which all variables are kept the same except one
• a push or pull
• a condition in an experiment that is changed in order to determine the effect

Tags

NGSS.MS-PS2-2

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.

Which word describes a push or pull on an object?

• Position
• Magnetism
• Mass
• Force

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

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

Tags

NGSS.MS-PS2-4

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