Free Printable TOPIC 4: ENERGY

1.

Unit SI for energy is ________.

a)

W

b)

J

c)

N

2.

$E_{k\ }=\ \frac{1}{2}\ mv^2\ ,\ formula\ for\ _{------.}$

a)

Kinetic energy

b)

Potential energy

c)

Energy

3.

$E_{p\ }=\ mgh\ ,\ formula\ for\ _{------.}$

a)

Kinetic energy

b)

Potential energy

c)

Energy

4.

How many joules of kinetic energy does a 6.1 kg book have when it is tossed across the room at a speed of 2.2 m/s ?

a)

14.762 J

b)

6.71 J

c)

13.42

5.

Jacob, the former platform diver for the Jumbo's Circus, had a kinetic energy of 11000 J just prior to hitting the bucket of water. If Jacob' s mass is 30 kg, then what is his speed.

a)

27.08 m/s

b)

366.7 m/s

c)

330 000 m/s

6.

A madman with the mass of 50 kg is standing on top of the roof whose height is 810 m from the earth. What is the gravitational potential energy of the madman?

a)

40 500 J

b)

397 305 J

c)

16.2 J

7.

A boy of mass 40 kg, climbs onto the roof of a garage. The roof is 35 m from the ground. How much potential energy did the boy gain by climbing onto the roof?

a)

1.14 J

b)

1 400 J

c)

13 734 J

8.

The picture shown the position of the cyclist. Choose the FALSE answer.

a)

Position A: Kinetic energy decrease, Potential energy increase

b)

Position B: Kinetic Energy minimum, Potential Energy Maximum

c)

Position C: Kinetic Energy increase, Potential energy decrease

d)

Position D: Kinetic energy decrease, Potential energy increase

9.

A coconut tree has a 2 m high on the tree from the ground and falling down under the gravitational reaction. Identify the h if the object falling down to 1.5 m

a)

2 m

b)

1.5 m

c)

0.5 m

10.

An object of 40 kg mass was lifted as high as 4 m from the ground and was let to fall under the gravitational reaction. Calculate the gravitational potential energy and the kinetic energy possess by the object before it fall.

a)

$Ep\ =\ 1569.6\ J\ ,\ Ek\ =\ 0\ J$

b)

$Ep\ =\ 160\ J\ ,\ Ek\ =\ 0\ J$

c)

$Ep\ =\ 0\ J\ ,\ Ek\ =\ 10\ J$

11.

An object of 20 kg mass was lifted as high as 2 m from the ground and was let to fall under the gravitational reaction. Calculate the gravitational potential energy and the kinetic energy possess by the object after it touch the ground.

a)

$Ep\ =\ 40\ J\ ,\ Ek\ =\ 0\ J$

b)

$Ep\ =\ 10\ J\ ,\ Ek\ =\ 0\ J$

c)

$Ep\ =\ 0\ J\ ,\ Ek\ =\ 392.4\ J$

TOPIC 4: ENERGY

Total questions: 11

Worksheet time: 8mins

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