AP Physics Misconceptions

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NGSS.MS-PS2-1

NGSS.MS-PS3-5

NGSS.MS-PS3-1

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NGSS.MS-PS2-2

NGSS.MS-PS2-1

NGSS.MS-PS3-5

When looking at friction problems, if the net force in the x-direction on an object is zero, what can we say about its acceleration?

• it is positive

• it is negative

• it is zero

• not enough information is given

Normal force is

• Always opposite the weight

• Always parallel and down the incline

• Always perpendicular to the surface

• It depends on the direction of motion

A box weighing 46 newtons rests on an incline that makes an angle of 25° with the horizontal. What is the magnitude of the component of the box’s weight perpendicular to the incline?

• 19N

• 21N

• 42N

• 26N

Tags

NGSS.MS-PS2-2

What direction does friction act relative to sliding?

• in the same direction

• in the opposite direction 

• need more information

• depends on the force

A box takes 40 N to start moving when the coefficient of static friction is .54. What is the weight of the box? 

• 81 N

• 18 N

• 98 N

• 74 N

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NGSS.MS-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 net force?

• 1.5 N

• 8 N

• 12N

• 0 N

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NGSS.MS-PS2-2

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

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NGSS.MS-PS2-2

NGSS.MS-PS2-1

Which of these is a correct sum statement for Fx?

• Fa - Ff = ma

• Fnet = Ff

• Fn/Fg

• Fa = ma

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1