Forces, Net Force Speed, D-T Graph

Front

What best describes the motion of the object? Options: Moving at a constant speed, Deceleration (negative acceleration), Acceleration, Stopped (no motion)

Back

Moving at a constant speed

Front

What best describes the motion of the object? Options: Moving at a constant speed, Deceleration (negative acceleration), Acceleration, Stopped (no motion)

Back

Stopped (no motion)

Front

During which part of the graph was the object moving the fastest? Options: A, B, C

Back

A

Front

During part C of the graph, what best describes the motion of the object? Options: Moving at a constant speed, Deceleration (negative acceleration), Acceleration, Stopped (no motion)

Back

Deceleration (negative acceleration)

Front

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.

Back

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

Front

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

Back

Adding grease to gears on a bike

Front

The friction between two objects depends on which two factors?

Back

type of surface and how hard the objects are pushed together

Front

Net force

Back

The combination of all forces acting on an object.

Front

What describes a force vector?

Back

Direction and magnitude

Front

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

Back

Its speed increases.