A spring with spring constant $k = 300\ \text{N m}^{-1}$ is compressed by $0.20\ \text{m}$ and used to launch a $2.0\ \text{kg}$ cart along a horizontal surface with $20\%$ of the energy lost due to friction. What is the final speed of the cart?

SLPaper 2

A machine lifts a $500\ \text{kg}$ load vertically upward at a constant speed of $2.00\ \text{m s}^{-1}$ . The gravitational field strength is .

SLPaper 1A

A block of mass $m$ slides down a rough incline of length $L$ and angle $\theta$ . The coefficient of dynamic friction is $\mu_d$ . The block starts from rest and reaches the bottom with speed . What is the correct expression for the energy dissipated by friction?

SLPaper 1A

The energy consumption of a device is shown by the Sankey diagram below:

What is the efficiency of this device?

SLPaper 1A

A $2.5\ kg$ object is attached to a spring ( $k = 400\ N\ m^{-1}$ ) and compressed on a frictionless horizontal surface. It is then released. After leaving the spring it slides onto a rough patch of length , where it travels the full before coming to rest. What is the average resistive force exerted by the rough patch?

IB Physics Topic A.3 Work, Energy and Power Questionbank

Practice IB Physics Topic A.3 Work, Energy and Power with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for A.3 Work, Energy and Power and mirrors Paper 1A, 1B, 2 style where relevant.

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9.81\ \text{N kg}^{-1}

9.81 N kg^{- 1}

(a)

Calculate the power output required to lift the load at this constant speed.

[2]

(b)

Determine the work done by the machine in $10.0\ \text{s}$ .

[2]

(c)

Explain why the load does not gain kinetic energy even though the machine is doing work.

[2]

v

−1

0.30\ m

1.2\ m

1.2\ m

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$2.2\ \text{m s}^{-1}$

$3.5\ \text{m s}^{-1}$

$4.0\ \text{m s}^{-1}$

$5.5\ \text{m s}^{-1}$

$0.13$

$0.90$

$0.30$

$0.10$

$mgL\sin\theta -\frac12 mv^2$

$mgL\cos\theta -\frac12 mv^2$

$\mu_d mgL\sin\theta$

$\mu_d mgL\cos\theta + \frac12 mv^2$

$10\ N$

$15\ N$

$20\ N$

$25\ N$