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Physics > Physics Test 2/2/23 > Flashcards

Physics Test 2/2/23 Flashcards

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1
Q

State the units of distance

A

Metres

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2
Q

State the units of speed

A

Metres per second (ms-1)

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3
Q

State the units of acceleration

A

Ms-2

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4
Q

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

A

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

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5
Q

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

A

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

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6
Q

State what acceleration is

A

Distance travelled per second

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7
Q

State what is meant by acceleration of an object

A

Increase in distance travelled per second

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8
Q

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

A

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

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9
Q

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

A

Camera roll

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10
Q

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

A

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

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11
Q

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

A

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

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12
Q

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

A

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

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13
Q

What unit is used for force

A

Newtons N

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14
Q

What unit is used for mass

A

Kilogram kg

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15
Q

What unit is used for weight

A

Newtons N

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16
Q

State newtons 1st law

A

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

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17
Q

What is meant by the term balanced force

A

One forces are equal in size and opposite in direction

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18
Q

What is meant by the term unbalanced force

A

One forces are not equal in size

19
Q

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

A

5000 N

20
Q

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

A

Friction

21
Q

State the relationship between mass and weight

A

W=mg

22
Q

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

A

600 N

23
Q

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

A

96N

24
Q

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

A

See camera roll

25
Q

Slate the relationship between force mass and acceleration

A

F = MA

26
Q

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

A

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

27
Q

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

A

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

28
Q

State the energy change that occurs in a lamp

A

Electrical to light energy

29
Q

State the energy change that occurs in a motor

A

Electrical to kinetic energy

30
Q

State the energy change that occurs in a buzzer

A

Electrical to sound energy

31
Q

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

A

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

32
Q

What is the unit for voltage

A

Volts V

33
Q

What is the unit for current

A

Amps A

34
Q

What is the unit for resistance

A

Ohms 

35
Q

What equipment would you use to measure voltage

A

A volt meter

36
Q

What equipment would you use to measure current

A

An ammeter

37
Q

What equipment would you use to measure resistance

A

An ohmmeter

38
Q

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?

A

V=1V
I=1A

39
Q

State the value of mains voltage in the UK

A

230 V

40
Q

State the relationship between voltage, current and resistance

A

V=IR

41
Q

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

A

Ohms law

42
Q

What happens to current if the resistance increases

A

If the resistance increases the current decreases

43
Q

How would a variable resistor be used as a dimmer switch

A

Resistance would change the bulb to make it brighter or dimmer

Physics (1 decks)

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