AP Physics Dynamics

Is it possible for the object in the diagram to be moving to the right and have this FBD?

• Yes. It's possible that the x forces were just left off the diagram.

• Yes. It could be moving at a constant velocity.

• No. The FBD shows that the system is in equilibrium.

• No. An FBD shows all F.

Tags

NGSS.HS-PS2-1

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

NGSS.HS-PS2-2

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

Is it possible for the normal force to be equal to the gravitational force?

• 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

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 moving at a constant rate of 2.5 m/s?

• A

• B

• C

• none of these

Tags

NGSS.MS-PS3-1

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 block of mass 5 kg is on a frictionless surface. A force of 10 N is applied to the block. What is the acceleration of the block?

• 1 m/s^2

• 2 m/s^2

• 3 m/s^2

• 4 m/s^2

Tags

NGSS.MS-PS2-2

A car is moving in a circle with a constant speed of 20 m/s. What is the direction of the net force acting on the car?

• In the direction of motion

• Opposite to the direction of motion

• Towards the center of the circle

• Away from the center of the circle