Physics Test 2/2/23

Question 1

State the units of distance

Answer 1

Metres

Question 2

State the units of speed

Answer 2

Metres per second (ms-1)

Question 3

State the units of acceleration

Answer 3

Ms-2

Question 4

Calculate the average speed of a runner that takes 20 seconds to run 200m

Answer 4

V =d/t =200/20 =10ms-1

Question 5

If a car travels at 25 ms-1 how long would it take to travel distance of 2 km?

Answer 5

T =d/v = 2000/25 = 80s

Question 6

State what acceleration is

Answer 6

Distance travelled per second

Question 7

State what is meant by acceleration of an object

Answer 7

Increase in distance travelled per second

Question 8

A small rocket gains a speed of 105 m/s-1 from rest in a time of three seconds. Calculate the acceleration

Answer 8

A = v-u/t. A = 105/3 =35ms-2

Question 9

What would a speed time graph of the Rockets three second journey look like

Answer 9

Camera roll

Question 10

Calculate the acceleration of a bus that accelerates from six m/s-1 to 18 m/s-1 in four seconds

Answer 10

A = v-u/t A =12/4 a=3ms-2

Question 11

Calculate the Acceleration of a cruise liner that accelerates from rest to 6MS in 10 minutes

Answer 11

A = v-u/t A=6/600 A=0.01ms-2

Question 12

Calculate the acceleration of a car that slows from rest to 20 m/s-1 in five seconds

Answer 12

A = v-u/t A= 20/5 A= -4ms-2

Question 13

What unit is used for force

Answer 13

Newtons N

Question 14

What unit is used for mass

Answer 14

Kilogram kg

Question 15

What unit is used for weight

Answer 15

Newtons N

Question 16

State newtons 1st law

Answer 16

Objects remain at rest or at a constant speed unless a force is applied

Question 17

What is meant by the term balanced force

Answer 17

One forces are equal in size and opposite in direction

Question 18

What is meant by the term unbalanced force

Answer 18

One forces are not equal in size

Question 19

A car exerts an engine force of 5000 N and travelling at a constant speed. State the size of the force acting in the opposite direction

Answer 19

5000 N

Question 20

A car exerts an engine force of 5000 N and is travelling at a constant speed. Name this force

Answer 20

Friction

Question 21

State the relationship between mass and weight

Answer 21

W=mg

Question 22

A woman has a mass of 60 kg calculate her weight on Earth

Answer 22

600 N

Question 23

Woman has a mass of 60 kg. Calculate her weight on the moon where G equals 1.6 NKG-1

Answer 23

96N

Question 24

An object of mass 100 kg is falling at a constant 70 meters per second draw a diagram showing the size and direction of the forces acting on it

Answer 24

See camera roll

Question 25

Slate the relationship between force mass and acceleration

Answer 25

F = MA

Question 26

A car of mass 900 kg is accelerated by force of 2700 N. Calculate its acceleration

Answer 26

F = ma A = f/m A=2700/900 A=3ms-2

Question 27

A lorry receives an engine thrust of 10 kN. If it’s accelerates at 2ms-2 calculate its mass.

Answer 27

F=ma m=f/a M=10,000/2 M=5,000kg

Question 28

State the energy change that occurs in a lamp

Answer 28

Electrical to light energy

Question 29

State the energy change that occurs in a motor

Answer 29

Electrical to kinetic energy

Question 30

State the energy change that occurs in a buzzer

Answer 30

Electrical to sound energy

Question 31

Write down an advantage to using a parallel circuit over a series circuit

Answer 31

If a component in one branch brakes, the other is still allowed to flow

Question 32

What is the unit for voltage

Answer 32

Volts V

Question 33

What is the unit for current

Answer 33

Amps A

Question 34

What is the unit for resistance

Answer 34

Ohms 

Question 35

What equipment would you use to measure voltage

Answer 35

A volt meter

Question 36

What equipment would you use to measure current

Answer 36

An ammeter

Question 37

What equipment would you use to measure resistance

Answer 37

An ohmmeter

Question 38

Two bulbs are connected in a series circuit to a 3 V battery. The current through the first bulb is 1A and the voltage across it is 2V. What is the voltage and current measured at the second bulb?

Answer 38

V=1V I=1A

Question 39

State the value of mains voltage in the UK

Answer 39

230 V

Question 40

State the relationship between voltage, current and resistance

Answer 40

V=IR

Question 41

What is the relationship between voltage, current and resistance more commonly known as

Answer 41

Ohms law

Question 42

What happens to current if the resistance increases

Answer 42

If the resistance increases the current decreases

Question 43

How would a variable resistor be used as a dimmer switch

Answer 43

Resistance would change the bulb to make it brighter or dimmer