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Science f3 chapter 7

Total questions: 86

Worksheet time: 4hrs 23mins

Name
Class
Date
1.
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
2.
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
3.

The roller coaster car has a mass of 500 kg. It is pulled from position 1 to 2 (30 m) by a motor. At the top of the ride the vertical distance top to bottom is 20 m. The motor pulls the car with a 4000 N force. Calculate the work done getting the car to the top of the ride.

a)

100 000J

b)

120 000J

c)

800 000J

d)

90 000J

4.
Is the amount of energy being transferred over a period of time.
a)
Power
b)
Energy
c)
Seconds
d)
Joules
5.
What is the unit of measurement for power?
a)
Joules
b)
Watts
c)
Voltage
d)
Calories
6.

The ability to do work or cause change:

a)

work

b)

energy

c)

momentum

d)

power

7.

Kinetic energy is associated with ---.

a)

speed

b)

position

c)

direction

d)

temperature

8.
Energy of a rock perched on a cliff is an example of...
a)
gravitational
b)
elastic
c)
chemical
d)
kinetic
9.
Energy from a compressed spring would be an example of...
a)
kinetic
b)
elastic
c)
gravitational
d)
chemical
10.
How do you calculate power?
a)
P = W/t
b)
P = E/t
c)
P = w * t
d)
P = bbq/chicken
11.
What is the formula for Kinetic Energy?
a)
PE = m*g*h
b)
KE = 1/2m*v2
c)
W = F*d
d)
P = W/t
12.
Gravitational potential energy depends on the ________ and ________ of the object. 
a)
Height and mass
b)
Friction and movement
c)
Mass and Movement
d)
Height and Friction 
13.

The SI Unit for Energy is

a)

Joule

b)

Newton

c)

Calorie

d)

Watt

14.

A soccer player kicks a ball with 20 Newtons of force causing it to travel 100 meters. How much work is done on the ball?

a)

200 J

b)

80 J

c)

5 J

d)

2000 J

15.

A worker climbs a ladder and does 8 J of work on a 2 N object. What is the distance they lift the object?

a)

18 m

b)

4 m

c)

10 m

d)

6 m

16.

Two workers use 100 N of force to move a sofa 2 meters in 2 seconds. How much power is required?

a)

100 watts

b)

400 watts

c)

104 watts

d)

50 watts

17.

Energy is

a)

Whether one feels like doing work

b)

the ability to do work

c)

calculated by dividing the amount of work by the amount of time to do the work

d)

just another word for work

18.

Diagram 3 shows a sack of rice being pushed over a distance of 5m. Calculate the work done( assume the gravitational force 10 N kg-1

a)

6 J

b)

60 J

c)

150 J

d)

1500 J

19.

Diagram 2 shows Mary is rowing a boat. Calculate the distance travelled by the boat if the work done is 1500J

a)

0.02 m

b)

30m

c)

1450 m

d)

75000m

20.

The work done by Ali to push a trolley for a distance of 30m is 600 J. calculate the force applied

a)

0.05 N

b)

20 N

c)

570 N

d)

18000N

21.

A stuntman with a mass of 60kg had climbed up the roof of a building which is 50m tall. If the power used for this stunt is 6000W, calculate the time taken by the stuntman to complete this stunt. (assume gravitational force = 10N kg-1)

a)

0.5 s

b)

1.2 s

c)

2s

d)

5s

22.

Diagram 3 shows an activity done by Mazlan. A 200 N weight is lifted by Mazlan to a height 1.5m in 3 second. Calculate the power needed to lift the object

a)

100 W

b)

300 W

c)

600 W

d)

900 W

23.

Prinsip keabadian tenaga menyatakan ____.

Principle of conservation of energy states _____.

a)

Tenaga boleh diciptakan.

Energy can be created.

b)

Tenaga boleh berubah kepada kuasa.

Energy can be transformed into power.

c)

Tenaga boleh dimusnahkan.

Energy can be destroyed.

d)

Tenaga boleh berubah kepada bentuk tenaga lain.

Energy can be transformed into another form of energy.

24.

Kirakan kerja untuk menarik laci sejauh 30cm dengan daya 2N.

Calculate the work to pull the drawer 30cm with a force of 2N.

a)

15 Nm

b)

60Nm

c)

0.6Nm

d)

0.15Nm

25.

Kirakan kerja menggerakkan meja sejauh 60cm dengan daya 5N. Tukarkan kepada unit Joule.

Calculate the work of moving the table 60cm with a force of 5N. Convert the unit into Joule.

a)

300 J

b)

0.3 J

c)

3 J

d)

30 J

26.

Pilih satu atau lebih penyataan yang BENAR tentang kerja?

Choose one or more statements that are TRUE about work?

a)

Kerja = Daya X Sesaran

Work = Force X Displacement

b)

Unit SI bagi kerja ialah Joule (J)

The SI unit for work is Joule (J)

c)

Kerja ialah untuk mendapatkan gaji.

Work is to earn a salary.

d)

Unit SI bagi kerja ialah Watt (W).

The SI unit for work is Watt (W).

27.

Ahmad menolak dinding dengan sedaya upayanya. Daya yang dikenakan Ahmad pada dinding ialah 400N. Kira kerja yang dilakukannya.

Ahmad pushed against the wall with all his might. The force exerted by Ahmad on the wall is 400N. Calculate the work he does.

a)

400 Nm

b)

0 Nm

c)

4 Nm

d)

4000 Nm

28.

Seorang pekerja menggunakan 150 J tenaga untuk menolak sebuah kereta sorong dalam masa 5 s. Hitung kuasa yang dijanakan olehnya.

A worker uses 150 J of energy to push a wheelbarrow in 5 s. Calculate the power generated by him.

a)

15 W

b)

30 W

c)

75 W

d)

750 W

29.

Tenaga keupayaan kenyal dapat ditakrifkan sebagai ___

Elastic potential energy can be defined as ___

a)

Tenaga yang diperolehi oleh objek kenyal apabila diregangkan atau dimampatkan.

Energy gained by an elastic object when stretched or compressed.

b)

Tenaga yang tersimpan di dalam sesuatu objek akibat daripada kedudukannya.

Energy stored in an object as a result of its position.

c)

Tenaga yang dipunyai oleh suatu jasad disebabkan oleh gerakannya.

The energy possessed by a body is due to its motion.

d)

Tenaga yang dipunyai oleh suatu jasad disebabkan oleh gerakannya dalam bentuk putaran.

The energy possessed by a body is due to its motion in the form of rotation.

30.

Seorang pemanah sedang menarik tali busur.apakah jenis tenaga yang tersimpan dalam busur ?

An archer is pulling a bowstring. What kind of energy is stored in a bow?

a)

Tenaga haba.

Heat energy.

b)

Tenaga kinetik.

Kinetic energy.

c)

Tenaga keupayaan kenyal.

Elastic potential energy.

d)

Tenaga keupayaan graviti.

Gravitational potential energy.

31.

Pilih satu atau lebih pasangan unit SI yang BENAR.

Select one or more pairs of CORRECT SI units.

a)

kerja - Joule

work - Joule

b)

tenaga - Joule

energy - Joule

c)

kuasa - Joule

power - Joule

32.

Tenaga keupayaan graviti dipengaruhi oleh ___ (pilih satu atau lebih jawapan yang betul)

Gravitational potential energy is influenced by ____ (choose one or more of the correct answer)

a)

sesaran objek

displacement of the object

b)

jisim objek

mass of the object

c)

pecutan graviti

acceleration of gravity

d)

ketinggian objek dari permukaan Bumi

height of object from the surface of the Earth

33.
a)

Gravitational potential energy

b)

Elastic potential energy

c)

Kinetic energy

d)

Potential energy

34.
a)

Potential energy

b)

Kinetic energy

c)

Gravitational potential energy

d)

Elastic potential energy

35.
a)

Kinetic energy

b)

Elastic potential energy

c)

Potential energy

d)

Gravitational potential energy

36.
a)

Elastic potential energy

b)

Potential energy

c)

Kinetic energy

d)

Gravitational potential energy

37.

Potential energy means

a)

energy stored in an object

b)

energy possessed by a moving object

c)

Kinetic energy

d)

energy of an object

38.

Kinetic energy means

a)

Kinetic energy

b)

Potential energy

c)

energy possessed by a moving object

d)

energy stored in an object

39.

Gravitational potential energy means

a)

work done to lift an object

b)

work done to compress an elastic object

c)

work done to stretch an elastic object

d)

work done to put down an object

40.

Elastic potential energy means

a)

work done to lift an object

b)

work done to put down an object

c)

work done to compress an elastic object

d)

work done to throw an object

41.

1 kg = ( )Newton

a)

10

b)

100

c)

0.1

d)

0.01

42.

Acceleration due to gravity
g= ( )  ms−2ms^{-2}  

a)

10

b)

100

c)

0.1

d)

0.01

43.

Energy cannot be

a)

created

b)

played

c)

talked

d)

changed

44.

Energy can only ( ) its form.

a)

create

b)

destroy

c)

change

d)

grab

45.

When gravitational potential energy maximum, kinetic energy

a)

maximum

b)

minimum

c)

zero

d)

no change

46.

When kinetic energy maximum, gravitational potential energy

a)

maximum

b)

minimum

c)

zero

d)

no change

47.

Gravitational potential energy increases, kinetic energy

a)

increases

b)

decreases

c)

no change

d)

zero

48.

When elastic potential energy maximum, kinetic energy

a)

maximum

b)

minimum

c)

zero

d)

no change

49.

When kinetic energy maximum, elastic potential energy

a)

maximum

b)

minimum

c)

zero

d)

no change

50.

When elastic potential energy increases, kinetic energy

a)

increases

b)

decreases

c)

zero

d)

no change

51.

Formula of gravitational potential energy

a)

12Fx\frac{1}{2}Fx

b)

mgh

c)

12mv2\frac{1}{2}mv^2

d)

12F\frac{1}{2}F

52.

Formula of kinetic energy

a)

mgh

b)

12Fx\frac{1}{2}Fx

c)

12mv2\frac{1}{2}mv^2

d)

12F\frac{1}{2}F

53.

Diagram shows a few books are placed on a table. What is the gravitational potential energy for the books on the table if the mass of a book is 0.3 kg?

a)

0.96 J

b)

1.5 J

c)

9.6 J

d)

15 J

54.

The mass of an eagle is 3 kg. Calculate the kinetic energy of the eagle when it flies with a velocity of 8 m/s.

a)

12 J

b)

24 J

c)

96 J

d)

192 J

55.

A car with a mass of 500 kg moves with a velocity of 30 m/s. Calculate the kinetic energy of the car.

a)

7500 J

b)

15000 J

c)

30000 J

d)

225000 J

56.

Diagram shows two coconut trees, P and Q. If the mass of coconuts on coconut trees, P and Q are 1.5 kg respectively, calculate the difference in gravitational potential energy of coconuts P and Q.

a)

0.5 J

b)

1.5 J

c)

7.5 J

d)

75 J

57.

Which of the following vehicles has gravitational potential energy?

a)

Boat

b)

Aeroplane

c)

Car

d)

Train

58.

What is the energy generated when a spring is compressed?

a)

Heat energy

b)

Kinetic energy

c)

Gravitational potential energy

d)

Elastic potential energy

59.

State the energy found on W.

a)

Heat energy

b)

Kinetic energy

c)

Elastic potential energy

d)

Gravitational potential energy

60.

State the type of energy found in position P.

a)

Elastic potential energy

b)

Heat energy

c)

Kinetic energy

d)

Gravitational potential energy

61.

State the energy found in Q.

a)

Elastic potential energy

b)

Gravitational potential energy

c)

Kinetic energy

d)

Heat energy

62.

What are the factor that affect the gravitational potential energy?

a)

Height

b)

Mass

c)

Velocity

d)

Distance

63.

Which of the following describe the characteristics of non-renewable energy sources?

a)

Can be depleted if the usage is not controlled

b)

Takes millions of years to be formed

c)

Can not cause environmental pollution

d)

Have limited sources

64.

Tenaga tidak boleh

Energy cannot be

a)

dicipta

created

b)

dimainkan

played

c)

bercakap

talked

d)

berubah

changed

65.

Tenaga hanya dapat () bentuknya.

Energy can only ( ) its form.

a)

buat

create

b)

memusnahkan

destroy

c)

ubah

change

d)

ambil

grab

66.

Apabila tenaga keupayaan graviti maksimum, tenaga kinetik

When gravitational potential energy maximum, kinetic energy

a)

maksimum

maximum

b)

minimum

minimum

c)

kosong

zero

d)

tiada perubahan

no change

67.

Apabila tenaga kinetik maksimum, tenaga berpotensi graviti

When kinetic energy maximum, gravitational potential energy

a)

maksimum

maximum

b)

minimum

minimum

c)

kosong

zero

d)

tiada perubahan

no change

68.

Tenaga berpotensi graviti meningkat, tenaga kinetik

Gravitational potential energy increases, kinetic energy

a)

meningkat

increases

b)

menurun

decreases

c)

tiada perubahan

no change

d)

kosong

zero

69.

Apabila tenaga berpotensi elastik maksimum, tenaga kinetik

When elastic potential energy maximum, kinetic energy

a)

maksimum

maximum

b)

minimum

minimum

c)

kosong

zero

d)

tiada perubahan

no change

70.

Apabila tenaga kinetik maksimum, tenaga keupayaan elastik

When kinetic energy maximum, elastic potential energy

a)

maksimum

maximum

b)

minimum

minimum

c)

kosong

zero

d)

tiada perubahan

no change

71.

Which of the following will increase the work done?

a)

Decreased power

b)

Decreased gravity

c)

Increased distance

d)

Decreased friction

72.

A wood with the mass of 2 kg is dropped from a height of 6 m. What is the kinetic energy of the wood when it reaches the ground?

a)

120 J

b)

130 J

c)

140 J

d)

150 J

73.

A rock with a mass of 2kg fell from a building of 20 metre height. What is the speed of the rock before the rock hits the ground?

a)

200 ms−1200\ ms^{-1}  

b)

400 ms−1400\ ms^{-1}  

c)

20 ms−120\ ms^{-1}  

d)

40 ms−140\ ms^{-1}  

74.

The S.I. unit of power is ( ).

(a)  

75.

The S.I. unit of work is ( ).

(a)  

76.

The Principle of Conservation of Energy states that

a)

energy can be created

b)

energy can be destroyed

c)

energy can be converted from one form to another

d)

energy can be lost

77.

Work = Force x ( )

(a)  

78.

A wooden block is put on the floor. Zi Jing pulls the wooden block horizontally using 2 N along 0.5 m. Calculate the amount of work done.

a)

2 J

b)

1 J

c)

3 J

d)

4 J

79.

William uses a pulley to pull a box weighing 15 kg vertically from the floor. The vertical displacement is 4m. Calculate the amount of work done. (Consider 1 kg = 10 N)

a)

60 J

b)

600 J

c)

30 J

d)

300 J

80.

A pulley is used to lift a table weighing 1000 N. The table is carried to a height of 2.5m in 50 seconds. Calculate the power of the pulley.

a)

50 W

b)

100 W

c)

25 W

d)

200 W

81.

Which of the following stores elastic potential energy?

a)

A compressed spring

b)

A fruit on a tree

c)

A bird nest on a tree

d)

Water in a dam

82.

An elevator at a shopping complex could fit 20 people when traveling upward of 10 m in 8 seconds. What is the power of the elevator if the total weight of the people is 16 000 N ?

a)

20 000 J

b)

40 000 J

c)

10 000 J

d)

30 000 J

83.

A weight that has a mass of 40 kg is lifted to the height of 5.2m. Calculate the gravitational potential energy gained by the weight.

a)

2080 J

b)

1040 J

c)

1580 J

d)

2580 J

84.

Calculate the gravitational potential energy of an object with a mass of 2kg at a height of 0.5m.

a)

10 J

b)

5 J

c)

15 J

d)

20 J

85.

A spring with length of 20cm was compressed with a 2kg weight till the length decreased to 12cm. What is the elastic potential energy of the spring?

a)

0.08 J

b)

0.16 J

c)

0.04 J

d)

0.12 J

86.

Calculate the kinetic energy of a ball with a mass of 200g and moves at 12.2 ms−1ms^{-1}  .

a)

7 .884 J

b)

14 . 884 J

c)

21. 884 J

d)

18. 884 J

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