Free Printable Physics IG 8

1.

A sky diver is falling at terminal velocity. He has not yet opened his parachute. What is the direction of both the velocity and his acceleration?

a)

A

b)

B

c)

C

d)

D

2.

Four objects are shown below. Each is acted on by two forces.

Which of the objects is in equilibrium ?

a)

A

b)

B

c)

C

d)

D

3.

What is the efficiency of a solar cell if 1000 J of solar energy hits the cell and 200 J are converted into electrical energy?

a)

10%

b)

20%

c)

30%

d)

40%

4.

What is electrical energy converted into when a drill is used?

a)

Kinetic energy

b)

Sound

c)

Heat

d)

All of the above

5.

a)

A

b)

B

c)

C

d)

D

6.

What is designed to change electrical energy into kinetic energy?

a)

A. capacitor

b)

B. generator

c)

C. motor

d)

D. transformer

7.

When an object moves in a straight line, which statement is true?

a)

When the object moves at a constant speed, the resultant force is zero

b)

When the object accelerates, the resultant force is zero

c)

When the object moves at a constant speed, the forward force is greater than the resistive force.

d)

The object requires a resultant force in order to move at a constant speed.

8.

Which of the following collections of properties contain only features which can be changed by a resultant force?

a)

Speed, direction, mass.

b)

Density, speed, shape

c)

Shape, speed, direction.

d)

Speed, direction, temperature

9.

What is potential energy?

a)

moving energy

b)

stored energy

c)

renewable energy

d)

non renewable energy

10.

a)

A

b)

B

c)

C

d)

D

11.

In the image, energy is being transformed from...

a)

chemical to electrical and then kinetic

b)

chemical to kinetic and then potential

c)

chemical to thermal and then kinetic

d)

None

12.

What is the formula for work?

a)

Force = work x distance

b)

Distance = force x work

c)

Work = force x distance

d)

Work = force x mass

13.

Complete the statement about the principal of Conservation of Energy.

Energy can be changed for one form to another but the total amount of energy

a)

always increases

b)

always decreases

c)

does not change

d)

varies according to the reaction

14.

A Radio releases 250J of energy 10J is released as heat , How much is released as sound?

a)

200J

b)

220J

c)

240J

d)

260J

15.

The % energy efficiency of an appliance is

a)

total energy input/ useful energy output x 100

b)

useful energy output /total energy input x100

c)

total energy input x useful energy input x100

d)

useful energy output /total energy input x50

16.

Calculate the PE of a 2 kg cat perched 10 meters above the ground.

a)

20 J

b)

200 J

c)

2.04 J

d)

200 W

17.

Which energy transfer occurs when a match burns

a)

chemical to thermal

b)

chemical to nuclear

c)

nuclear to chemical

d)

thermal to chemical

18.

a)

A

b)

B

c)

C

d)

D

19.

A small steel ball is dropped from a low balcony. Ignoring air resistance, which statement describes its motion?

a)

It falls with decreasing acceleration.

b)

It falls with constant acceleration.

c)

It falls with decreasing speed.

d)

It falls with constant speed.

20.

Which speed/ time graph applies to an object at rest?

a)

A

b)

B

c)

C

d)

D

21.

Just after she jumps out of the plane (before the parachute opens). The relative forces will be

a)

Weight force is equal to the friction force

b)

Friction force is constant

c)

Weight force is greater that the friction force

d)

Friction force is greater than the weight force

22.

Describe the motion at point a. on the graph.

a)

constant speed

b)

accelerating

c)

decelerating

d)

stationary

23.

If this was the journey of a parachutist, what is happening at point e. ?

a)

He is decelerating

b)

He is accelerating

c)

He has reached a faster constant speed

d)

He has reached a lower constant speed.

24.

The graph shows the vertical speed of a parachutist. At which point did they open the parachute?

a)

A

b)

B

c)

C

d)

D

25.

When a parachute canopy is opened more drag is created because:

a)

It has a large mass

b)

It has a large surface area

c)

It is travelling at terminal speed

d)

The person is now vertical

26.

This is a velocity time graph of a skydiver falling. Which point on the graph shows the point where the forces acting on him are equal?

a)

A

b)

B

c)

C

27.

A skydiver jumps from a plane. The instant she jumps, the force(s) acting on her are

a)

Weight

b)

Weight and air resistance

c)

Weight and Friction

d)

Air resistance

28.

Where does most of the energy go in this transformation.

a)

Electrical energy

b)

Light

c)

Heat

d)

other

29.

Where does most of the energy go for this transformation.

a)

heat

b)

electrical

c)

light

d)

joules

30.

The energy efficiency shown in this diagram is:

a)

About 10%.

b)

About 30%.

c)

About 60%.

d)

Impossible to tell.

31.

Identify the energy transfer

a)

electrical to chemical to light

b)

kinetic to potential

c)

chemical to electrical to light

d)

light to sound

32.

A kettle uses 100J of electrical energy to produce 7J of sound energy and 93J of thermal energy. How efficient is the kettle?

a)

100%

b)

7%

c)

93%

d)

95%

33.

A washing machine uses 250J of electrical energy to produce 125J of useful energy. How efficient is it?

a)

5%

b)

50%

c)

55%

d)

100%

34.

A hairdryer uses 300J of energy to produce 60J of sound energy and 240J of thermal energy. Calculate it's efficiency.

a)

80%

b)

90%

c)

20%

d)

100%

35.

What type of device might this Sankey be about?

a)

A very efficient LED light bulb

b)

A very inefficient incandescent light bulb

c)

A coal power plant

d)

A wind turbine

36.

Which of these equations is correct?

a)

$efficiency\ =\ \frac{useful\ energy\ transferred}{total\ energy\ transferred}$

b)

$efficiency\ =\ \frac{total\ energy\ transferred}{useful\ energy\ transferred}$

c)

$energy\ =\ efficiency\ \times100\%$

d)

$efficiency\ =\ \frac{wasted\ energy\ transferred}{total\ energy\ tranferred}$

37.

what is the unit of work?

a)

Newton

b)

Joule

c)

Watt

d)

meter

38.

if you push a cart with a force of 60 N for 2 m... how much work have you done

a)

120 J

b)

30 J

c)

120 N

d)

30 N

39.

Two people shove on a wall with 100 N. The wall doesn’t move. How much work is done?

a)

100J

b)

100N

c)

0J

d)

0N

40.

There is no work done when a box is moved across the room. True or false?

a)

True

b)

False

Physics IG 8

Total questions: 40

Worksheet time: 22mins

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