Kinematics & Energy

Question 1

What is kinematics?

Answer 1

Kinematics is the branch of mechanics that describes the motion of objects without considering the forces that cause the motion.

Question 2

True or False: Kinematics only deals with the forces acting on an object.

Answer 2

False

Question 3

Fill in the blank: The three main quantities in kinematics are ______, ______, and ______.

Answer 3

displacement, velocity, acceleration

Question 4

What is displacement?

Answer 4

Displacement is the change in position of an object, defined as the shortest distance from the initial to the final position.

Question 5

Which of the following represents average velocity? A) Total distance / Total time B) Change in position / Change in time C) Initial velocity + Final velocity / 2

Answer 5

B) Change in position / Change in time

Question 6

What is the formula for calculating acceleration?

Answer 6

Acceleration is calculated as the change in velocity divided by the time taken.

Question 7

True or False: Velocity is a scalar quantity.

Answer 7

False

Question 8

What is the difference between speed and velocity?

Answer 8

Speed is a scalar quantity that refers to how fast an object is moving, while velocity is a vector quantity that includes both speed and direction.

Question 9

Fill in the blank: The unit of acceleration in the SI system is ______.

Answer 9

meters per second squared (m/s²)

Question 10

What does a velocity-time graph represent?

Answer 10

A velocity-time graph represents the relationship between an object’s velocity and the time elapsed.

Question 11

What is the area under a velocity-time graph equal to?

Answer 11

The area under a velocity-time graph is equal to the displacement of the object.

Question 12

What is uniform motion?

Answer 12

Uniform motion is motion at a constant speed in a straight line.

Question 13

True or False: An object can have a constant speed but an accelerating velocity.

Answer 13

True

Question 14

What is the formula for calculating displacement in uniformly accelerated motion?

Answer 14

Displacement (s) = Initial velocity (u) × time (t) + 0.5 × acceleration (a) × time² (t²)

Question 15

What is instantaneous velocity?

Answer 15

Instantaneous velocity is the velocity of an object at a specific moment in time.

Question 16

Fill in the blank: The term ‘free fall’ refers to the motion of an object under the influence of ______ only.

Answer 16

gravity

Question 17

What is the acceleration due to gravity near the Earth’s surface?

Answer 17

The acceleration due to gravity near the Earth’s surface is approximately 9.81 m/s².

Question 18

Which equation relates initial velocity, final velocity, acceleration, and time?

Answer 18

Final velocity (v) = Initial velocity (u) + acceleration (a) × time (t)

Question 19

What is a projectile?

Answer 19

A projectile is an object that is thrown into the air with an initial velocity and is subject to the force of gravity.

Question 20

True or False: In projectile motion, the horizontal and vertical motions are independent of each other.

Answer 20

True

Question 21

What is the maximum height of a projectile dependent on?

Answer 21

The maximum height of a projectile is dependent on its initial velocity and the angle of launch.

Question 22

Fill in the blank: The vertical motion of a projectile is affected by ______.

Answer 22

gravity

Question 23

What is the formula for finding the range of a projectile launched at an angle?

Answer 23

Range (R) = (Initial velocity² × sin(2θ)) / g, where θ is the launch angle and g is acceleration due to gravity.

Question 24

What does the term ‘relative motion’ refer to?

Answer 24

Relative motion refers to the calculation of the motion of an object as observed from a particular reference frame.

Question 25

True or False: All motion is relative.

Answer 25

True

Question 26

What is the formula for calculating final velocity in uniformly accelerated motion?

Answer 26

The formula is v = u + at, where v is final velocity, u is initial velocity, a is acceleration, and t is time.

Question 27

True or False: The formula s = ut + 1/2 at² calculates the distance traveled under constant acceleration.

Answer 27

True

Question 28

Fill in the blank: In the equation v² = u² + 2as, 's' represents _______.

Answer 28

displacement

Question 29

What does 'u' represent in the kinematic equations?

Answer 29

Initial velocity

Question 30

Which kinematic equation would you use to find the displacement when time is not known?

Answer 30

v² = u² + 2as

Question 31

Multiple Choice: Which of the following is NOT a kinematic equation? A) v = u + at B) s = vt C) s = ut + 1/2 at² D) v² = u² + 2as

Answer 31

B) s = vt

Question 32

What is the relationship between acceleration and velocity in kinematics?

Answer 32

Acceleration is the rate of change of velocity.

Question 33

True or False: In free fall, the only force acting on an object is gravity.

Answer 33

True

Question 34

Fill in the blank: The term 'a' in the kinematic equations stands for _______.

Answer 34

acceleration

Question 35

What is the value of acceleration due to gravity on Earth?

Answer 35

Approximately 9.81 m/s²

Question 36

What is the formula for kinetic energy?

Answer 36

KE = 1/2 mv^2

Question 37

True or False: Potential energy depends on the position of an object.

Answer 37

True

Question 38

Fill in the blank: The unit of energy in the International System of Units (SI) is ______.

Answer 38

Joule

Question 39

What is the formula for gravitational potential energy?

Answer 39

PE = mgh

Question 40

Multiple choice: Which of the following is a form of mechanical energy? A) Thermal B) Chemical C) Kinetic D) Nuclear

Answer 40

C) Kinetic

Question 41

What does the symbol 'm' represent in the kinetic energy formula?

Answer 41

Mass of the object

Question 42

True or False: Energy can be created and destroyed.

Answer 42

False

Question 43

What is the principle of conservation of energy?

Answer 43

Energy cannot be created or destroyed, only transformed from one form to another.

Question 44

Fill in the blank: The energy stored in an object due to its height is called ______ energy.

Answer 44

Potential

Question 45

What is the formula for elastic potential energy?

Answer 45

PE = 1/2 kx^2

Question 46

Multiple choice: Which energy form is associated with motion? A) Potential B) Kinetic C) Thermal D) Chemical

Answer 46

B) Kinetic

Question 47

What does 'g' represent in the gravitational potential energy formula?

Answer 47

Acceleration due to gravity (approximately 9.81 m/s² on Earth)

Question 48

True or False: Work is done when a force causes an object to move.

Answer 48

True

Question 49

What is the formula for work done?

Answer 49

W = Fd cos(θ)

Question 50

Fill in the blank: The total mechanical energy is the sum of ______ energy and ______ energy.

Answer 50

Kinetic; Potential

Question 51

Multiple choice: Which law states that the total energy of an isolated system remains constant? A) Law of Thermodynamics B) Law of Conservation of Mass C) Law of Conservation of Energy D) Law of Motion

Answer 51

C) Law of Conservation of Energy

Question 52

What is the formula for power in terms of work done?

Answer 52

P = W/t

Question 53

True or False: Power is the rate at which work is done.

Answer 53

True

Question 54

What is the unit of power in the International System of Units (SI)?

Answer 54

Watt

Question 55

Fill in the blank: When energy is transformed into heat, it is often referred to as ______ energy.

Answer 55

Thermal

Question 56

Multiple choice: Which of the following is NOT a form of energy? A) Light B) Sound C) Time D) Chemical

Answer 56

C) Time

Question 57

What is the formula for gravitational potential energy at a height 'h'?

Answer 57

PE = mgh

Question 58

True or False: An object at rest has kinetic energy.

Answer 58

False

Question 59

What is the relationship between kinetic energy and speed?

Answer 59

Kinetic energy increases with the square of the speed.

Question 60

Fill in the blank: The energy of an object due to its motion is called ______ energy.

Answer 60

Kinetic

Question 61

Multiple choice: Which type of energy is stored in a compressed spring? A) Kinetic B) Gravitational C) Elastic D) Thermal

Answer 61

C) Elastic