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CHAPTER 7 ENERGY & POWER

Total questions: 40

Worksheet time: 51mins

Name
Class
Date
1.
If an object moves from a high place to a lower place, will it gain or lose potential energy?
a)
lose
b)
gain
c)
neither
d)
both
2.

A girl weighs 400 N. She runs up a flight of stairs of height 5 m in 4 seconds. Her power is:

a)

320 W

b)

400 W

c)

500 W

d)

2 000 W

3.
At which point(s) on the roller coaster is the gravitational potential energy at its maximum?
a)
A
b)
B
c)
C
d)
D
4.

Marie lifts a 5kg mass from the floor and puts on table which is one meter height. Calculate the work done

a)

100J

b)

500J

c)

50J

d)

1000J

5.

1 kg = ( )Newton

a)

10

b)

0.1

c)

100

d)

1

6.

Who has the most power?

a)

Ms Criza who encodes her observation tools using 12000J of work in 20 minutes.

b)

Sir Pau who studies his 5 lessons for the next classes in 15 minutes.

c)

Mrs Punzalan who used 50N force to inoculate mushrooms at a speed of 2m/s.

d)

Mrs Masalunga who watches her learners while taking their quiz in 30 minutes.

7.

Adam with mass of 58kg carries a bag weighing 5kg climbing 8m stairs to his house. How much work did Adam do?

a)

2320J

b)

4070J

c)

5040J

d)

5280J

8.

Choose correct statement.

a)

At position X,

bob at maximum height.

b)

At position Y,

speed of bob increasing.

c)

At position Z,

bob stationary, speed = zero.

d)

From position Y to X,

bob stationary, speed = zero.

9.

Choose correct statement.

a)

At position X,

Elastic P.E. decreasing

K.E. increasing

b)

At position Y,

Elastic P.E. = minimum

K.E. = maximum

c)

At position Z,

Elastic P.E. = maximum

K.E. = zero

d)

From position Y to X,

Elastic P.E. increasing

K.E. decreasing

10.
a)

Kinetic energy

b)

Gravitational potential energy

c)

Elastic potential energy

d)

All energy

11.

What is the energy involved?

a)

Gravitational potential energy

b)

Kinetic energy

c)

Elastic potential energy

d)

Heat energy

12.

Diagram 2 shows Hakim is playing skateboard. At which position, the gravitational potential energy is zero while the kinetic energy is maximum?

a)

P

b)

Q

c)

R

d)

S

13.

A crane uses 112.5W to lift iron rod weighing 900N for height of 4.5m. How much time does the crane take to complete the work?

a)

3.3 minutes

b)

33 seconds

c)

3.6 minutes

d)

36 seconds

14.

Diagram 1 shows two situation, P and Q. What type of energy is possessed by situation P and Q?

a)

P : Gravitational Potential Energy

Q : Elastic Potential Energy

b)

P : Gravitational Potential Energy

Q : Kinetic Energy

c)

P : Elastic Potential Energy

Q : Kinetic Energy

d)

P : Kinetic Energy

Q : Gravitational Potential Energy

15.

Diagram 3 shows a coconut falling from a tree. What is the speed of the coconut before it reaches the ground?

a)

4.44 m s−14.44\ m\ s^{-1}  

b)

12.65 m s−112.65\ m\ s^{-1}  

c)

16.00 ms−116.00\ ms^{-1}  

d)

22.50 ms−122.50\ ms^{-1}  

16.

Which of the following statement describes the principle of conservation of energy?

a)

Energy cannot be created and destroyed but can change to other form

b)

Some of the energy is destroyed when it change form

c)

Energy can be created but cannot be destroyed

d)

Energy can be created and destroyed

17.

Why a car with the same velocity as a motorcycle have higher kinetic energy?

a)

Car has larger size

b)

Car is capable of carrying more load

c)

Car has more tires

d)

Car has larger mass

18.

Given that the original length of the spring is 50 cm, final length is 30 cm and final force exerted on the spring is 20 N. How much elastic potential energy is possessed by the compressed spring

a)

4J

b)

2J

c)

10J

d)

6J

19.

Aizul pulled a box up a smooth ramp from A to B with a force of 30 N over a distance of 4 m (in the direction of the force) in 10 s. Calculate the power needed

a)

20W

b)

12W

c)

30W

d)

10W

20.

A laborer pulled a bucket of cement weighing 500 N from the ground to the first floor of a building using a pulley system. The first floor is 10 m from the ground. What is the work done by the laborer?

a)

2500J

b)

1000J

c)

500J

d)

5000J

21.

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

22.

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

23.

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

24.

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

25.

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

26.

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

27.

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

28.

The SI Unit for Energy is

a)

Joule

b)

Newton

c)

Calorie

d)

Watt

29.
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 
30.
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
31.
How do you calculate power?
a)
P = W/t
b)
P = E/t
c)
P = w * t
d)
P = bbq/chicken
32.
Energy from a compressed spring would be an example of...
a)
kinetic
b)
elastic
c)
gravitational
d)
chemical
33.
Energy of a rock perched on a cliff is an example of...
a)
gravitational
b)
elastic
c)
chemical
d)
kinetic
34.

Kinetic energy is associated with ---.

a)

speed

b)

position

c)

direction

d)

temperature

35.

The ability to do work or cause change:

a)

work

b)

energy

c)

momentum

d)

power

36.
What is the unit of measurement for power?
a)
Joules
b)
Watts
c)
Voltage
d)
Calories
37.
Is the amount of energy being transferred over a period of time.
a)
Power
b)
Energy
c)
Seconds
d)
Joules
38.

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

39.
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
40.
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

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