OpenSciEd 8.1 Soccer Assessment Review

A volley ball player hits a ball. A free body diagram for this system would look like...

• Diagram A

• Diagram B

• Diagram C

• Diagram D

Answer explanation

A free body diagram shows each subsystem in the collision and the forces acting on that subsystem.

The force arrow should point to where the object is being pushed on by the other subsystem.

The forces in a collision are equal in strength and opposite in direction.

Tags

NGSS.MS-PS2-1

If one object is moving and the other object is stationary before a collision...

• The peak force will be greater on the stationary object because it is being pushed.

• The peak force will be greater on whichever object is smaller (has less mass).

• The peak force will be greater on the moving object because it had kinetic energy at first.

• The peak force will be the same on both objects.

Tags

NGSS.MS-PS2-1

Changes in motion during a collision are caused by...

• transfer of kinetic energy.

• forces between objects.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS3-5

Changes in shape during a collision are caused by...

• transfer of kinetic energy.

• forces between objects.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Peak force is...

• The maximum amount of force that can be applied to an object before it permanently deforms.

• The maximum amount of deformation that an object can experience before it breaks.

• The largest amount of force an object experiences during a collision.

• The largest amount of force an object can experience and only deform temporarily.

When the speed of one or more objects in a collision increases...

• The peak force in the collision decreases.

• The peak force in a collision increases.

• The kinetic energy in the system decreases.

• The kinetic energy in the system increases.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS3-1

NGSS.MS-PS3-5

When the mass of one or more objects in a collision increases...

• The peak force on the heavier object is greater.

• The peak force on the lighter object is greater.

• The peak force on both objects is less, but still equal.

• The peak force on both objects is greater but still equal.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

When the speed of one or more objects in a collision increases...

• The peak force on the faster object is greater.

• The peak force on the slower or stationary object is greater.

• The peak force on both objects is less, but still equal.

• The peak force on both objects is greater but still equal.

Tags

NGSS.MS-PS2-1

How does the mass of a moving object affect its kinetic energy?

(assume the objects are all moving at the same speed)

• Moving objects with less mass have more kinetic energy.

• Moving objects with more mass have more kinetic energy.

• Moving objects with more mass have less kinetic energy.

• The mass of a moving object doesn't affect its kinetic energy.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

How does the speed of a moving object affect its kinetic energy?

(assume the objects have the same mass)

• Faster moving objects have more kinetic energy.

• Slower moving objects have more kinetic energy.

• Faster moving objects have less kinetic energy.

• The speed of a moving object doesn't affect its kinetic energy.

Tags

NGSS.MS-PS3-1