Mechanical Energy in Biomechanics: Master the Energy of Motion

Question 1

How does work influence an object's mechanical energy?

Accepted Answer

Work increases the object's mechanical energy.

Answer

Work decreases the object's mechanical energy.

Answer

Work does not affect the object's mechanical energy.

Answer

The impact of work on an object's mechanical energy depends on the object's mass.

Question 2

What is the SI unit of mechanical energy?

Accepted Answer

Joule (J)

Answer

Kilogram (kg)

Answer

Newton (N)

Answer

Watt (W)

Question 3

A ball is thrown vertically upwards. At the peak of its trajectory, which form of mechanical energy does it possess?

Accepted Answer

Gravitational potential energy

Answer

Elastic potential energy

Answer

Kinetic energy

Answer

Thermal energy

Question 4

Which of the following factors influence the kinetic energy of an object?

Accepted Answer

Mass and velocity

Answer

Temperature and volume

Answer

Height and mass

Answer

Shape and color

Question 5

During a jump, an athlete's gravitational potential energy is converted into kinetic energy. This conversion is mainly determined by:

Accepted Answer

Height of the jump

Answer

Distance of the jump

Answer

Angle of the jump

Answer

Speed of the jump

Question 6

Which of the following is an example of a non-conservative force?

Accepted Answer

Friction

Answer

Gravitational

Answer

Elastic

Question 7

In an isolated system, the total amount of mechanical energy is constant. This concept is known as:

Accepted Answer

Law of conservation of mechanical energy

Answer

Newton's laws of motion

Answer

Law of thermodynamics

Question 8

Which of the following actions involves the conversion of mechanical energy into electrical energy?

Accepted Answer

Cycling with a dynamo

Answer

Swimming

Answer

Playing a flute

Question 9

A spring is stretched and then released, causing a ball attached to it to move. This exemplifies the conversion of:

Accepted Answer

Elastic potential energy to kinetic energy

Answer

Kinetic energy to gravitational potential energy

Answer

Thermal energy to elastic potential energy

Answer

Chemical energy to thermal energy

Question 10

Which of the following is a factor that can affect the efficiency of a simple machine?

Accepted Answer

Friction and energy loss

Answer

Height and distance

Answer

Shape and color

Answer

Temperature and pressure

Question 11

Define mechanical energy.

Accepted Answer

The total energy of an object due to its motion and position

Answer

The energy possessed by an object in motion

Answer

The energy stored in an object due to its position or height

Question 12

A ball is thrown vertically upward. What happens to its kinetic and potential energy at the highest point of its trajectory?

Accepted Answer

Kinetic energy is zero, potential energy is maximum

Answer

Kinetic energy is maximum, potential energy is zero

Answer

Both kinetic and potential energy are zero

Question 13

Which factors affect the potential energy of an object?

Accepted Answer

Mass, height above a reference point, and gravitational acceleration

Answer

Mass, height above a reference point, and velocity

Answer

Mass, velocity, and acceleration

Answer

Height above a reference point, velocity, and gravitational acceleration

Question 14

As a person jumps off a diving board, what energy transformation occurs?

Accepted Answer

Potential energy is converted into kinetic energy

Answer

Kinetic energy is converted into potential energy

Answer

Both potential and kinetic energy remain constant

Question 15

Which type of energy is stored in a compressed spring?

Accepted Answer

Elastic potential energy

Answer

Gravitational potential energy

Answer

Kinetic energy

Question 16

What is the SI unit of energy?

Accepted Answer

Joule

Answer

Meter

Answer

Newton

Question 17

What is true about the mechanical energy of a person running at a constant speed?

Accepted Answer

It is constant

Answer

It is increasing

Answer

It is decreasing

Answer

It is zero

Question 18

Which of the following is an example of a non-conservative force?

Accepted Answer

Friction

Answer

Gravity

Answer

Spring force

Answer

Tension

Question 19

As a skier starts from rest at the top of a hill and skis down, what happens to their potential and kinetic energy?

Accepted Answer

Potential energy decreases while kinetic energy increases

Answer

Both potential and kinetic energy remain constant

Answer

Potential energy increases while kinetic energy decreases

Question 20

Which of the following is not a factor that influences mechanical energy?

Accepted Answer

Temperature

Answer

Velocity

Answer

Mass

Answer

Height

Question 21

A ball is thrown vertically upwards. At its highest point, which energy form does the ball have the greatest amount of?

Accepted Answer

Potential energy

Answer

Kinetic energy

Answer

Mechanical energy

Answer

Thermal energy

Question 22

Identify the valid unit for measuring mechanical energy:

Accepted Answer

Joule

Answer

Newton

Answer

Kilogram

Answer

Watt

Question 23

Provide an example from the real world that demonstrates the principle of mechanical energy conservation.

Accepted Answer

A roller coaster ride

Answer

A burning candle

Answer

A chemical reaction

Answer

A nuclear explosion

Question 24

Which of the following is the SI unit of mechanical energy?

Accepted Answer

Joule

Answer

Watt

Answer

Newton

Answer

Kilocalorie

Question 25

A 10 kg object is lifted vertically at a constant speed of 2 m/s. What is the power required to lift the object?

Accepted Answer

20 W

Answer

100 W

Answer

5 W

Answer

10 W

Question 26

Which of the following statements about potential energy is correct?

Accepted Answer

It depends on the position of an object relative to a reference point.

Answer

It is always positive.

Answer

It depends on the velocity of an object.

Question 27

A ball is thrown vertically upward. At the highest point of its trajectory, which of the following forms of mechanical energy does it possess?

Accepted Answer

Potential energy

Answer

Both potential and kinetic energy

Answer

Kinetic energy

Answer

Neither potential nor kinetic energy

Question 28

Which of the following factors does NOT affect the kinetic energy of an object?

Accepted Answer

Height

Answer

Mass

Answer

Velocity

Question 29

The law of conservation of mechanical energy states that:

Accepted Answer

The total mechanical energy in an isolated system remains constant.

Answer

The potential energy in a system is always greater than the kinetic energy.

Answer

Mechanical energy can be created or destroyed.

Question 30

A person jumps off a diving board and enters the water below. During this process, which of the following energy transformations occurs?

Accepted Answer

Potential energy to kinetic energy to thermal energy

Answer

Thermal energy to potential energy to kinetic energy

Answer

Kinetic energy to potential energy to thermal energy

Question 31

Which of the following is an example of an elastic collision?

Accepted Answer

A ball bouncing off a trampoline

Answer

A person jumping onto a soft surface

Answer

A bullet hitting a target

Answer

A car crashing into a tree

Question 32

The efficiency of a machine is the ratio of:

Accepted Answer

Net useful work output to total energy input

Answer

Kinetic energy to potential energy

Answer

Total energy input to net useful work output

Question 33

Which of the following is NOT a type of mechanical energy?

Accepted Answer

Electrical energy

Answer

Elastic energy

Answer

Potential energy

Answer

Kinetic energy

Question 34

Which of the following factors does NOT affect the potential energy of an object?

Accepted Answer

Velocity

Answer

Gravitational acceleration

Answer

Height

Answer

Mass

Question 35

Which of the following is a measure of kinetic energy?

Accepted Answer

1/2 mv^2

Answer

mg

Answer

kx^2

Answer

mgh

Question 36

Which of the following is a factor that affects the kinetic energy of an object?

Accepted Answer

Mass and velocity

Answer

Temperature and pressure

Answer

Volume and density

Answer

Height and gravity

Question 37

Which of the following is a device that converts mechanical energy into electrical energy?

Accepted Answer

Generator

Answer

Transformer

Answer

Battery

Answer

Capacitor

Question 38

Which of the following is an example of a non-conservative force?

Accepted Answer

Friction

Answer

Gravity

Answer

Tension

Answer

Spring force

Question 39

What type of mechanical energy is associated with an object's movement?

Accepted Answer

Kinetic energy

Answer

Chemical energy

Answer

Thermal energy

Answer

Electrical energy

Question 40

An object raised above the ground has what type of energy?

Accepted Answer

Gravitational potential energy

Answer

Thermal energy

Answer

Kinetic energy

Answer

Elastic potential energy

Question 41

When a moving object comes to a stop, its kinetic energy is converted into:

Accepted Answer

Other forms of energy, like heat or sound

Answer

Electrical energy

Answer

Potential energy

Answer

Chemical energy

Question 42

Which of these factors DOES NOT influence the amount of gravitational potential energy an object has?

Accepted Answer

Its velocity

Answer

Its mass

Answer

The strength of the gravitational field

Answer

Its height above a reference point

Question 43

At its highest point, a swinging pendulum has:

Accepted Answer

Maximum potential energy and zero kinetic energy

Answer

Zero potential and kinetic energy

Answer

Equal amounts of potential and kinetic energy

Answer

Maximum kinetic energy and zero potential energy

Question 44

What is the term for an object's ability to do work?

Accepted Answer

Energy

Answer

Velocity

Answer

Power

Answer

Force

Question 45

In a closed system, the total mechanical energy remains:

Accepted Answer

Constant

Answer

Increasing

Answer

Fluctuating

Answer

Decreasing

Question 46

What type of energy is stored in a stretched rubber band?

Accepted Answer

Elastic potential energy

Answer

Thermal energy

Answer

Kinetic energy

Answer

Gravitational potential energy

Question 47

What is the SI unit for mechanical energy?

Accepted Answer

Joule (J)

Answer

Newton (N)

Answer

Watt (W)

Answer

Pascal (Pa)

Question 48

Which of these actions involves the transformation of gravitational potential energy into kinetic energy?

Accepted Answer

Jumping off a diving board

Answer

Running on a treadmill

Answer

Lifting a weight

Answer

Cycling uphill

Question 49

At the starting line of a 100m sprint, a sprinter has:

Accepted Answer

High potential energy and low kinetic energy

Answer

Low potential energy and high kinetic energy

Answer

High potential energy and high kinetic energy

Answer

Low potential energy and low kinetic energy

Question 50

As a basketball player prepares to shoot the ball, the player's kinetic energy is at its maximum:

Accepted Answer

Just before leaving the ground

Answer

When the ball leaves their hand

Answer

Upon landing back on the ground

Answer

At the peak of their jump

Question 51

Which activity involves primarily a conversion of potential energy to kinetic energy?

Accepted Answer

A skier gliding down a slope

Answer

A runner maintaining a constant speed on a flat surface

Answer

A gymnast holding a static pose on the rings

Answer

A person holding a weight above their head

Question 52

In a system where only conservative forces act, the total mechanical energy:

Accepted Answer

Remains constant

Answer

Always increases

Answer

May increase or decrease depending on the direction of the forces

Answer

Always decreases

Question 53

A gymnast swings on uneven bars. Neglecting air resistance, what happens to the gymnast's potential energy as they swing from the higher bar to the lower bar?

Accepted Answer

Decreases

Answer

Increases

Answer

Remains constant

Question 54

A pole vaulter uses a flexible pole to propel themselves over a bar. During the bending of the pole before liftoff, what energy transformation occurs?

Accepted Answer

Kinetic energy is transformed into elastic potential energy

Answer

Elastic potential energy is transformed into gravitational potential energy

Answer

Potential energy is transformed into kinetic energy

Question 55

Two balls of equal mass are thrown vertically upwards. Ball A is thrown with double the initial velocity of Ball B. Neglecting air resistance, how will the maximum height reached by Ball A compare to that of Ball B?

Accepted Answer

Four times higher

Answer

The same

Answer

Half as high

Answer

Twice as high

Question 56

A long jumper lands in a sand pit. What is the primary reason for the decrease in their kinetic energy?

Accepted Answer

Work done by the sand to oppose their motion

Answer

Air resistance

Answer

Conversion of kinetic energy to potential energy

Answer

Conservation of mechanical energy

Question 57

Which scenario is an example of mechanical energy not being conserved?

Accepted Answer

A ball rolling on a grassy field gradually slows down

Answer

A pendulum swinging back and forth with minimal air resistance

Answer

A projectile launched vertically upwards, neglecting air resistance

Question 58

During the downward phase of a squat, what energy transformations occur within the muscles?

Accepted Answer

Some potential energy is transformed into kinetic energy, while some is dissipated as heat

Answer

All potential energy is converted to kinetic energy

Answer

Kinetic energy is converted to potential energy