Free Printable Topic 4: Work, Energy and Power

1.

The unit of work is

a)

watt

b)

hertz

c)

joule

d)

pascal

2.

How do you determine the work done from a force-displacement graph?

a)

Find the area under the curve

b)

Find the slope

c)

y divided by x for a single point

d)

Not possible

3.

How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?

a)

15 J

b)

45 J

c)

0 J

d)

5 J

4.

Which two forces do NO work on the gold block? (tick more than 1 answer)

a)

Fa

b)

Fg

c)

Ff

d)

Fn

5.

A block slides down a ramp at constant speed of 6 m/s. Which force does a negative value of work?

a)

Fn

b)

Fg

c)

Ff

d)

Fa

6.

A block slides down a ramp at constant speed of 6 m/s. Which force does NO work?

a)

Fn

b)

Fg

c)

Ff

d)

Fa

7.

What is the common formula for work?

a)

W=F v cos (angle between the direction of motion and the force)

b)

W=F d cos (angle between the direction of motion and the force)

c)

W=F m cos (angle between the direction of motion and the force)

d)

W=F t cos (angle between the direction of motion and the force)

8.

When is work positive?

a)

Work is positive if a force is opposite the direction of motion.

b)

Work is positive if a force is in the same direction as the direction of motion.

c)

Work is positve if a force is perpendicular to the direction of motion.

9.

When is work negative?

a)

Work is negative when a force is in the same direction as the direction of motion.

b)

Work is negative when a force is opposite the direction of motion.

c)

Work is negative when a force is perpendicular to the direction of motion.

10.

Work is a _____.

a)

vector; the direction of the work vector

b)

vector; whether the work adds or removes energy from the object

c)

scalar; the direction of the work vector

d)

scalar; whether the work adds or removes energy from the object

11.

At which point(s) on the roller coaster is the gravitational potential energy at its maximum?

a)

A

b)

B

c)

C

d)

D

12.

At which point(s) on the roller coaster is the kinetic energy at its maximum?

a)

A

b)

B

c)

C

d)

D

13.

What does the Law of Conservation of Energy state?

a)

Energy cannot be created or destroyed

b)

Nothing can exchange energy

c)

Energy will increase over time.

d)

Energy will decrease over time.

14.

Is energy always conserved?

a)

Always

b)

Often

c)

Never

d)

Sometimes

15.

The SI Unit for Energy is

a)

Joule

b)

Potential

c)

Calorie

d)

Kilojoule

16.

When my velocity triples, my kinetic energy increases by ______ times.

a)

9

b)

3

c)

1.5

d)

4.5

17.

The equation for KINETIC ENERGY is

a)

KE = mass x gravity

b)

KE = 1/2 height x speed

c)

KE = mass²

d)

KE = 1/2 mass x speed²

18.

Which equation would you use to find distance when you know mass, V_f, V_i, and Force?

a)

W = KE_f - KE_i

b)

F⋅d = KE

c)

W = 1/2 mv_f² - 1/2 mv_i²

d)

F⋅d = 1/2 mv_f² - 1/2 mv_i²

19.

A stretched rubber band represents what type of potential energy?

a)

gravitational potential energy

b)

elastic potential energy

c)

chemical potential energy

d)

kinetic potential energy

20.

Gravitational potential energy depends on which two factors?

a)

mass and height above the ground

b)

distance and speed

c)

speed and height above the ground

d)

mass and speed

21.

According to Hooke's law; Force is equal to -

a)

Spring Constant × Extension

b)

Spring Constant ÷ Extension

c)

Spring Constant + Extension

22.

What Quantity can you calculate from the area under the graph?

a)

distance

b)

Force

c)

spring constant

d)

Work done

23.

The SI unit for power is...?

a)

Watts

b)

Joules

c)

Newtons

d)

Meters

24.

You do 90 joules of work in 30 seconds. How much power have you generated?

a)

30 watts

b)

3 watts

c)

120 watts

d)

270 watts

25.

Which are the Equations for Power?

a)

Power = Energy Transferred / Time

b)

Power = Work Done / Time

c)

Power = Energy Transferred x Time

d)

Power = Work Done x Time

26.

Which of the following is the equation of power (can tick more than 1)

a)

$P\ =F\ \cdot s$

b)

$P\ =\ F\ \cdot v$

c)

$P\ =\frac{E}{t^2}$

d)

$P\ =\ \frac{E}{t\ }$

27.

Power is also defined as dot product of

a)

Force and displacement

b)

Force and mass

c)

Force and velocity

d)

Force and time

28.

What is the difference between calculating power and work?

a)

Power takes into account the time it takes to complete a task

b)

Work takes into account the time it takes to complete a task

c)

Power is force/area

d)

Work is force/area

29.

If mass of a moving object is doubled, its K.E becomes:

a)

2 times

b)

4 times

c)

5 times

d)

16 times

30.

Kinetic energy depends on

a)

mass and height

b)

mass and speed

c)

height and speed

d)

mass and force

31.

Work-energy theorem can be expressed as

a)

$Fa\ =\ K_{final}\ -\ K_{initial}$

b)

$ma\ =\ \ K_{final}\ -\ K_{initial}$

c)

$Fs\ =\ K_{final}\ -\ K_{initial}$

d)

$F\ v\ =\ \ K_{final}\ -\ K_{initial}$

32.

The speed of an object is doubled. Its kinetic energy is therefore

a)

The same

b)

Doubled

c)

Tripled

d)

Quadrupled

33.

What happens to the kinetic energy of a moving object if the net work done is positive?

a)

The kinetic energy increases.

b)

The kinetic energy decreases

c)

The kinetic energy remains the same.

d)

The kinetic energy is zero.

34.

An object of mass M, being pushed to a distance along a horizontal surface. What is the work done by gravity?

a)

$-Mgd$

b)

$Zero$

c)

$Mgd$

d)

$Fd$

35.

The energy stored in the spring of a watch is

a)

K.E

b)

Electrical Energy

c)

Elastic P.E

d)

Solar Energy

Topic 4: Work, Energy and Power

Total questions: 35

Worksheet time: 35mins

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