AP Physics C

The velocity of an object of mass m is given by the equation v = 2x + 4. What is an expression for the kinetic energy of the object?

• 2m

• m(2 + x)

• m(4x + x²)

• m(2x²+8x+8)

Tags

NGSS.HS-PS3-1

An object is pushed by a force given by F(x) = 6x – 4. What is the amount of work done to push the object 4 m.

• 16 J

• 20 J

• 32 J

• 44 J

Tags

NGSS.HS-PS3-2

An object with zero initial potential energy  experiences a conservative force given by F(x) = x²  + 2 . What is the equation for the potential energy U of this object? 

• U(x) = x³/3 + 2x 

• U(x) = -x³/3 - 2x 

• U(x) = 2x

• U(x) = -x³ + 2x

Tags

NGSS.HS-PS3-2

What is the expression of the kinetic energy of an object of mass 5 kg whose acceleration is given by a(t) = 4t – 5 and that is initially at rest?

• 2.5(4t -5)

• 5(2t² - 5t)²

• 5(2t² - 5t)

• 2.5(2t² - 5t)²

Tags

NGSS.HS-PS3-2

If a force moves an object of mass m so that its velocity is given by v(t) = 4t – 2, what is the power exerted by that force?

• 0.5m(4t - 2)²

• 4m(4t - 2)

• 4m(2t²-2t)

• 4m

Tags

NGSS.HS-PS2-1

If the power delivered to an object by a force acting on it is given by P(t) = t³ – 2t and the velocity of the object is given by v(t) = 2t, what is the force acting on the object in terms of t? 

• F(t) = t³ - 4t

• F(t) = t³

• F(t) = t²/2- 1

• F(t) = 3t²- 2

Tags

NGSS.HS-PS2-1

An object that starts at rest from the origin is pushed by a constant force of 10 N has a position given by x(t) = 5t². What is the power delivered to the object by the force at time t = 1 s? 

• 50 J

• 50 W

• 100 J

• 100 W

Tags

NGSS.HS-PS2-1

What equation correctly fits the position-time graph of a mass in SHM?

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Tags

NGSS.HS-PS4-1

A block of mass 0.5kg on a horizontal surface is attached to a horizontal spring of negligible mass and spring constant 50N/m. The other end of the spring is attached to a wall, and there is negligible friction between the block and the horizontal surface. When the spring is unstretched, the block is located at x=0m. The block is then pulled to x=0.3m

and released from rest so that the block-spring system oscillates between x=−0.3m and x=0.3m. What is the magnitude of the acceleration of the block and the direction of the net force exerted on the block when it is located at x=0.3m?

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Tags

NGSS.HS-PS2-1

A block attached to the lower end of a vertical spring oscillates up and down. If the spring obeys Hooke’s law, the period of oscillation depends on which of the following?

I. Mass of the block

II. Amplitude of the oscillation

III. Force constant of the spring

• I only

• II only

• I and II

• I and III