Forces, Net Force Speed, D-T Graph

What best describes the motion of the object?

• Moving at a constant speed

• Deceleration (negative acceleration)

• Acceleration

• Stopped (no motion)

What best describes the motion of the object?

• Moving at a constant speed

• Deceleration (negative acceleration)

• Acceleration

• Stopped (no motion)

Tags

NGSS.MS-PS3-1

During which part of the graph was the object moving the fastest?

• A

• B

• C

Tags

NGSS.MS-PS3-1

During part C of the graph, what best describes the motion of the object?

• Moving at a constant speed

• Deceleration (negative acceleration)

• Acceleration

• Stopped (no motion)

Tags

NGSS.MS-PS3-1

You are pushing a box for your teacher to a new location. You started on concrete, but then move the box on the grass to its new location. How does the change from concrete to grass affect the motion of the box?

• You are increasing friction which makes it harder to push on the grass.

• You are reducing friction which makes it harder to push on the grass.

• You are reducing friction which makes it easier to push on the grass.

• You are increasing friction which makes it easier to push on the grass.

Tags

NGSS.MS-PS2-2

Which of the following in an example of DECREASING friction intentionally?

• Adding salt to an ice-covered path to prevent slipping

• putting tires on your bike that have more tread

• adding grease to gears on a bike

• using a belt with grips between gears instead of a smooth belt

The friction between two objects depends on which two factors?

• mass and force

• type of surface and distance

• gravity and mass

• type of surface and how hard the objects are pushed together

What is net force?

• A measure of how fast an object is moving.

• The combination of all forces acting on an object.

• A push or pull

• A measure of how an object's motion is changing.

Tags

NGSS.MS-PS2-2

A force vector is described by its

• direction and magnitude

• speed and direction

• mass and weight

• mass and inertia

If you apply more force to an object, what happens to its speed?

• Its speed increases.

• Its speed decreases.

• Its speed stays constant.

• Its speed drops to 0 m/s.

Tags

NGSS.MS-PS2-2