Mechanics Random Retrieval

This quiz contains all the questions in the Mechanics section. The website will pick 10 questions at random.

1 / 10

The diagram above shows a uniform rod of negligible mass. At which position on the rod is no moment exerted?

A

B

C

D

2 / 10

A VW campervan cruises along a straight, flat Autobahn at a speed of 130 kmh^-1. The total resistive force, due to air resistance, is 900 N.

If the overall efficiency of the campervan is 18%, calculate the energy obtained from its fuel during 42 km journey.

3.25x10⁷ J

5.85x10⁷ J

1.23x10¹⁰ J

6.81x10¹⁰ J

3 / 10

Select the best statement for Newton's 3rd Law:

An object will remain at rest or at a constant velocity unless acted on by a resultant force.

An object will remain at rest unless acted on by a resultant force.

When two objects interact they will exert equal and opposite forces on each other.

The rate of change in momentum of a body is directly proportional to the resultant force applied.

4 / 10

Complete the sentence: "Acceleration is always __________ the resultant force."

in the opposite direction as

perpendicular to

in the same direction as

irrelevant to

5 / 10

The SI unit for a Newton is _______ .

N

kgs^-1

kgms^-1

kgms^-2

6 / 10

A Y7 drags behind them their cooking, PE kit and textbooks behind them with a force of 676 N and an angle of 30°. Calculate the vertical component of the force.

247 N

338 N

585 N

923 N

7 / 10

A man of 75 kg has an upward force applied to him of 735.75 N. Does he lift off the ground?

Can't tell from information given.

Yes

No

8 / 10

Burj Khalifa (Arabic: برج خليفة‎) is the tallest building in the world stood at 828 m. A family are stood at a observation deck at 555 m and the super strong toddler throws it's rattle away at a velocity of 21 ms^-1 and an angle of 43°.

Calculate how long the rattle takes to hit the ground. g_Earth = 9.81 ms^-2

9.1 s

12.2 s

14.5 s

18.3 s

9 / 10

Which is the correct definition for acceleration?

The rate of change of an object's displacement.

The rate of change of an object's speed.

The rate of change of an object's velocity.

The rate of change of an object's speed, squared.

10 / 10

A scuba diver surfaces after a dive. She begins to swim towards the boat at a constant speed of 67 cms^-1 and due to a current in the water this takes her 70 seconds an an angle of 32°. Calculate the time taken if there was no current at the same speed.

40 s

47 s

59 s

67 s

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