Mechanics Random Retrieval

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

1 / 10

Select the SI unit for Energy.

Js^-1

m kg s^-1

m²kg s^-2

m²kg s^-3

2 / 10

If an object is on its pivot, what can be said about the moments?

The total clockwise moment about the pivot is greater than the total anticlockwise moment about the pivot.

The total clockwise moment about the pivot is less than the total anticlockwise moment about the pivot.

The total clockwise moment about the pivot is equal to the total anticlockwise moment about the pivot.

The total clockwise moment about the pivot is twice as large as the total anticlockwise moment about the pivot.

3 / 10

This graph shows the velocity of a skydiver during a jump. Select the sentence which best describes his motion.

The skydiver jumps from the plane and accelerates to their terminal velocity. They then deploy a smaller parachute to slow them down, before deploying their larger parachute and landing.

The skydiver jumps from the plane and accelerates to their terminal velocity. They change their body shape to a less aerodynamic shape, increasing their drag before reverting to their original position. They then deploy their parachute and land.

The skydiver jumps from the plane and accelerates to their terminal velocity. They change their body shape to a less aerodynamic shape (X), increasing their drag before reverting to their original position. They change their body shape back to X before landing.

The skydiver jumps from the plane and accelerates to their terminal velocity. They change their body shape to a less aerodynamic shape (X), but get caught in a gust of wind which pushes them back up into the sky. Then they deploy their parachute before landing.

4 / 10

The International Space Station remains in orbit in space, which Newtonian Law applies, if any?

Newton's First Law

Newton's Second Law

Newton's Third Law

None

5 / 10

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

in the opposite direction as

perpendicular to

in the same direction as

irrelevant to

6 / 10

Select the missing phrase. "A joiner uses a hammer to hit a nail into wood. When the hammer strikes the nail, _____________

the nail exerts an equal force back on the hammer and doesn't move.

the nail exerts an equal force back on the hammer and moves into the wood.

the nail exerts a force proportional to its size back on the hammer and doesn't move.

the nail exerts a force proportional to its size back on the hammer and moves into the wood.

7 / 10

Select the best statement for Newton's 1st Law:

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

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

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

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

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 velocity?

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

Select if the following is a scalar or a vector: length

Scalar

Vector

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