Physics 20 - Dynamics

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 net force?

• 1.5 N

• 8 N

• 12N

• 0 N

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NGSS.HS-PS2-1

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.HS-PS2-1

What happens to the acceleration of an Atwood machine as the difference between the two masses increases?

• increases

• decreases

• does not change

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NGSS.HS-PS2-1

Why is there no net force in the middle of this graph? This is F to t for an elevator.

• There is. You can't trick me.

• The elevator is at rest

• The elevator is accelerating

• The elevator has a constant speed

Tags

NGSS.HS-PS2-1

Why is there no net force at the start of this graph? This is F to t for an elevator.

• There is. You can't trick me.

• The elevator is at rest

• The elevator is accelerating

• The elevator has a constant speed

Tags

NGSS.HS-PS2-1

Why is there a net force in the second segment of this graph? This is F to t for an elevator.

• There isn't. You can't trick me.

• The elevator is at rest

• The elevator is accelerating

• The elevator has a constant speed

Tags

NGSS.HS-PS2-1

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

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NGSS.HS-PS2-1

Which of these is a correct sum statement for Fx?

• Fa - Ff = ma

• Fnet = Ff

• Fn/Fg

• Fa = ma

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NGSS.HS-PS2-1

What's happening in this FBD?

• Forward acceleration

• Braking

• at rest

• constant velocity

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NGSS.HS-PS2-1

Is it possible to be moving to the left like this and have friction in that direction?

• Yes. You have negative acceleration.

• Yes. You have a constant velocity

• No. The force vectors must always point in the direction of motion

• No. You have negative acceleration.

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NGSS.HS-PS2-1