Free Printable Chapter 7 Energy and Power :)

1.

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

2.

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

3.

Work is defined as the product of (a) (mass/force) and displacement.

4.

S.I unit for work is (a) (Joule/Newton).

5.

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

a)

$4.44\ m\ s^{-1}$

b)

$12.65\ m\ s^{-1}$

c)

$16.00\ ms^{-1}$

d)

$22.50\ ms^{-1}$

6.

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

7.

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

8.

Which of the following activity uses the highest energy?

a)

Pushing a punctured bicycle

b)

Finishing homework

c)

Disposing trash

d)

Climbing mountain with a bag containing necessities for two days

9.

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

10.

(a) (Power/Work) is defined as the product of force and displacement in the direction of the force.

11.

A (a) (stationary/moving) object does not possess kinetic energy.

12.

Weight is the product of mass and (a) (force/acceleration) of gravity.

13.

What is the energy involved?

a)

Gravitational potential energy

b)

Kinetic energy

c)

Elastic potential energy

d)

Heat energy

14.

a)

Kinetic energy

b)

Gravitational potential energy

c)

Elastic potential energy

d)

All energy

15.

What is the formula of elastic potential energy?

a)

$=\ mgh$

b)

$=\ \frac{1}{2}Fx$

c)

$=\frac{1}{2}mv^2$

d)

$=\ \frac{work}{time}$

16.

What is the formula for gravitational potential energy

a)

$=mgh$

b)

$=\frac{1}{2}Fx$

c)

$=\frac{1}{2}mv^2$

d)

$=Fs$

17.

What is the formula of kinetic energy?

a)

$=\ mgh$

b)

$=\frac{1}{2}Fx$

c)

$=\frac{1}{2}mv^2$

d)

$\frac{work}{time}$

18.

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

19.

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.

20.

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

Chapter 7 Energy and Power :)

Total questions: 20

Worksheet time: 22mins

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