1D Dynamics Physics

A force of 8 Newton’s is applied to a crate so that it moves at a constant velocity of 1.5 m/s. What is the magnitude of the frictional force?

• 1.5 N

• 8 N

• 12N

• 0 N

Tags

NGSS.MS-PS2-2

Is this object in equilibrium?

• Yes and it's moving right

• Yes and its at rest

• No, it's accelerating right

• No, it's at rest

What's happening in this FBD?

• Forward acceleration

• Braking

• at rest

• constant velocity

Tags

NGSS.HS-PS2-1

Is it possible for the normal force to be zero?

• Yes. If the surface is horizontal.

• Yes. If the surface is vertical

• No. FN will always be less than Fg

• No. Fg will be less than FN.

Tags

NGSS.HS-PS2-1

Here are 3 FBD diagrams for an elevator. Consider them to be A, B, C. Which one shows an elevator accelerating upward?

• A

• B

• C

• none of these

Tags

NGSS.MS-PS2-2

Here are 3 FBD diagrams for an elevator. Consider them to be A, B, C. Which one shows an elevator at rest?

• A

• B

• C

• none of these

Here are 3 FBD diagrams for an elevator. Consider them to be A, B, C. Which one shows an elevator moving at a constant rate of 2.5 m/s?

• A

• B

• C

• none of these

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Forces cause acceleration.

• True. Every acceleration requires a force.

• True. Every force causes acceleration.

• False. Acceleration can occur when there is no net force

• False. Only net forces cause acceleration.

Tags

NGSS.MS-PS2-2

A tennis ball is thrown upward by a student so that it leaves their hand at 5.29 m/s. After it leaves their hand, what keeps it moving up?

• The initial force of their hand overcame gravity

• Nothing. The ball simply has inertia.

• gravity keeps it moving up.

• It is not actually moving up. That is a construct.

Tags

NGSS.MS-PS2-4

Why is this funny?

• Because gravity.

• It's not the impact velocity, it's the stopping acceleration that causes destruction

• because most people don't understand it

• the greater your mass is the harder you hit

Tags

NGSS.HS-PS2-1