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WorksheetsLHTB Physics Pre-Exam (2.3 Mechanics – Kinetics)
Total questions: 58
Worksheet time: 29mins
For a car weighing 1000 N, what force would be required to accelerate the car to 3 ms-2...
3000 N
3270 N
305.8 N
A time period of 10 microseconds is equal to a frequency of...
100kHz
10kHz
1mHz
The SI unit of acceleration is the…
metre per second squared (m/s2)
square metre (m2)
metre per second (m/s)
If a body starts at rest and reaches 84 m/s in 3 seconds, its acceleration is…
28m/s^2
14m/s^2
252m/s^
The SI unit of velocity is the…
metre per second (m/s)
metre (m)
metre per second squared (m/s2)
An aircraft flies 1350 nmiles in 2h 15mins. What is the average speed?
600nmiles/h
600miles/h
150nmiles/h
A spring extends 7 cm to the ground and back again 20 times a minute. What is the period?
3s
7cm
1/3 cycle
A cyclist goes from rest to 50 m/s in 5 seconds. What is the average acceleration?
10m/s^2
8m/s^2
12m/s^
What is the period of a frequency of 4 Hz?
8 seconds
4 seconds
0.25 seconds
A dot rotates around the circumference of a circle. If the vertical position of this dot is plotted on a graph with respect to time the result will be…
a sinusoidal waveform
a transverse waveform
a linear motion
A freely falling body, falling from a height of 2km, and assuming g = 10m/s2, will strike the ground in a time of...
20s
80s
200s
What is the angular velocity of a shaft rotating at 300rpm in radians/second?.
2π radians/second
5π radians/second
10π radians/second
The force that acts on a body to cause it to rotate in a circular path is called the...
centrifugal force
inertia force
centripetal force
An aircraft of 2 metric tonnes uses 800 kilojoules kinetic energy to make an emergency stop. Its brakes apply a force of 10 kiloNewtons. What distance does it travel before it comes to a stop?
40m
400m
80m
A body rotating at an angular velocity of 5 radians/sec, with a radius of 5 metres has a speed of...
25 metres per second
5π metres per second
5 metres per second
A mass of 400 kg moves 27metres, with a force of 54N, what is the work produced?
1458J
10.1 KJ
583.2 KJ
A mass on a spring nearly hits the ground 20 times a minute, its frequency is...
3 cycles per second
20 cycles per second
1/3 cycles per second
A body travelling at 20 m/s accelerates to 36 m/s in 8 seconds, what is its acceleration?
8m/s^2
4m/s^2
2m/s^2
A body dropped from 10 m will hit the ground in...
2 seconds
0.2 seconds
1.41 seconds
What is the rate of gravity?
9.81m/s^2
0.981m/s^2
12.7m/s^2
An object travels 18 km in 1 minute 30 seconds. What is its average speed?
270m/s
100m/s
200m/s
100 m is approximately…
109 yards
220 yards
66 yards
A car moves over a distance of 5 miles at steady speed in 10 minutes. What is the speed?
30 mph
15 mph
60 mph
A spaceship travels a distance of 480,000 miles in 2 days. What is its speed?
36,000 mph
48,000 mph
10,000 mph
A cyclist covers a distance of 1,000 m at a constant speed in 90 seconds, What is his speed?
11.1 m/s
12.5 m/s
50 m/s
How long will it take a car moving at 60 km/hr to travel 90 km?
40 minutes
75 minutes
90 minutes
An aircraft travels at 500 km/hr for 30 minutes at steady speed. How far does it move in that time?
500 km
1000 km
250 km
Which of the following affect the velocity of an object?
Speed and direction
Speed and distance
Speed and mass
Acceleration involves
change in speed or direction of movement
steady speed over a fixed period of time
change in position with time
What acceleration is produced if a mass increases speed from rest to 10 ft/sec in 5 seconds?
2 ft/sec^2
50ft/sec^2
0.5ft/sec^2
A car travelling at a speed of 5 m/s accelerates at the rate of 1 m/s2. How long will it take to reach a speed of 20 m/s?
10 secs
15 secs
20 secs
Newton’s laws of motion apply to…
all substances irrespective of state
gases and liquids only
solid substances only
Which of Newton’s Laws apply most directly to an aircraft which is accelerating down a runway?
The 1st law
The 2nd law
The 3rd law
Which of Newton’s Laws apply most directly to a car which is slowing down due to the braking action?
The 1st law
The 3rd law
The 2nd law
F = ma is an equation which expresses...
Newton’s 1st law
Newton’s 3rd law
Newton’s 2nd law
What force is required to produce an acceleration of 5 m/s2 on a mass of 2 kg?
10N
2.5N
50N
If a force of 10 lbf produces an acceleration of 2.5 ft/sec2, on what mass is it acting?
4 lbs
25 slugs
4 slugs
What is acceleration?
Rate of change of velocity
Rate of change of movement
Rate of change of position
In a gear train the driver has 100 TPI and the driven has 50 TPI...
The driven rotates twice as fast
The driven rotates half as fast
The driven rotates at the same speed
An aircraft of 2 metric tonnes lands with 400 kilojoules of energy, 10 kiloNewtons of force is applied at the brakes, how far does the aircraft take to stop?
40M
400M
80M
A radar rotates 1 revolution each 30 seconds and uses 10J of energy each revolution. How many joules does it use in a day?
720kJ
28.8kJ
7200kJ
A light aircraft flies in a semi-circle from point A to point B. If the circle has a radius of 20km and the time taken is 30 minutes, the average speed is…
125.7km/h
80km/h
110km/h
The landing speed of an aircraft is 54 m/s2. If the maximum deceleration is 3m/s2 the minimum length of runway required is…
360m
162m
486m
The number of radians in a semi circle are...
Exactly 3
π
2π
The angular velocity of 500 RPM is, in rads/seconds is equal to...
16.66π rads/s
8.33π rads/s
1000π rads/s
Which of Newton's laws relates to the formula: Force = mass * acceleration?
1st
2nd
3rd
The period of simple pendulum is…
longer on the earth than on the moon
longer for a heavy pendulum bob
independent of its mass
A satellite requires 10 Joules to rotate half a revolution, which takes 30 seconds. What is the energy required for one day?
28,000 J
1,200 J
14,400 J
The size of Centripetal Force on an object travelling in a circle...
increase with increasing mass of the object
decrease with increasing mass of the object.
increases with an increasing radius of circle
For an object in circular motion at constant velocity, if the radius of its path is doubled the centripetal force will
double
half
remain the same
An aircraft weighing 6400 pounds lands at a speed of 10 ft/Sec and stops in 10 Seconds. What force was generated by the brakes (assuming gravity as 32 ft/sec)
-200 lbs
-2000 lbs
-640 lbs
For every action there is an equal and opposite reaction.' This is known as...
Newton’s first law
Newton’s third law
Newton’s second law
One radian is equal to…
the angle subtended at the centre of a circle when the arc-length formed between two radial lines is equal in length to the radius
66.7 degrees
the angle subtended at the centre of a circle when the arc-length formed between two radial lines is equal to π
A weight on a spring almost touches the floor 7 times over 21 seconds. What is its frequency?
1/3 cycles/second
7 cycles/second
3 cycles/second
Which of the following statements describes centrifugal force?
Greater than centripetal force and acts in the opposite direction
Smaller than centripetal force and acts in the opposite direction
Equal to centripetal force and acts in the opposite direction
A body starting from rest accelerates at the rate of 20 metres per second squared. What is the distance covered until the body reaches a velocity of 50 metres per second?
50 metres
0.625 metres
62.5 metres
A body starting from rest accelerates at the rate of 20 metres per second squared. What is the distance covered until the body reaches a velocity of 50 metres per second?
300 milliseconds
1.25 seconds
3 seconds
A drive shaft has a speed 150π radians a second. What is the speed in RPM?
4500
9000
1500
