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# Projectiles

A projectile is a particle that moves under the influence of its body weight alone. This means that all other forces are not considered.

A projectile motion takes place when an object moves in the air and is under the influence of gravity.

This motion is always curved – it follows a parabolic trajectory. In addition, objects carrying out a projectile motion are pulled by gravitational force and therefore must hit the ground.

## Examples of projectiles

Real-life examples of projectile motions are:

• The movement of a bullet shot from a gun.

• The movement of cannonballs.

• Throwing a javelin.

• Casting a stone.

• Jumping into a swimming pool.

## Types of projectile motion

There are two types of projectile motion – horizontally shot projectiles, and non-horizontally shot projectiles.

### Horizontally shot projectiles

This takes place when an object is launched in a horizontal direction from a height above the ground. From this elevation, the object follows a curved path before hitting the ground. An example of a horizontally shot projectile is a bullet shot from a gun in the horizontal direction.

A horizontally shot projectile. Image: Njoku, StudySmarter Originals

### Non-horizontally shot projectiles

This occurs when an object is launched from the ground or from a height above the ground upwards, giving rise to a complete parabolic motion. An example of a non-horizontally shot projectile is a rocket projected vertically from the ground.

A non-horizontally shot projectile. Image: Njoku - StudySmarter Originals

## Components of a projectile

Projectile motion is best understood when split into two components: horizontal and vertical.

If a ball B is launched from the ground at a point G, the position of the ball along the curved path before it hits the ground can be given as the coordinates (x, y).

The pathway and components of a projectile. Image: Njoku - StudySmarter Originals

Remember that the ball moves at velocity v, and at an angle θ to the horizontal. To find the horizontal component of the velocity x and vertical component y, we apply Pythagoras' theorem. Then:

the resolution of velocity into the vertical and horizontal components, Njoku - Study Smarter Originals

The equation is regarded as the horizontal component of the velocity in the projectile motion while the equation is the vertical component of the velocity.

To further determine the horizontal component of the motion, we apply SUVAT equations.

Remember:

Note that for horizontal motion there is no acceleration, thus a = 0.

So, the horizontal component of a projectile motion is:

Remember that the velocity u is replaced with the horizontal component of the velocity of the object.

Thus: x = ut cosθ is the equation of the horizontal component of a projectile motion.

However, to determine the vertical component, you should note that the object initially moves upwards. This means that its acceleration is in the opposite direction of gravity, so:

Also, note that the value of u in this case is the vertical component of the velocity of the object. So, the vertical component of a projectile motion is:

Thus: is the vertical component equation of the projectile motion.

Understanding these equations along with a basic knowledge of the general equations of motion is important.

## Time of flight, range, and maximum height

In projectile motion questions, you will need to calculate the range, maximum height, and time of flight. A step-by-step approach helps you understand how to solve these in this text.

### What is the time of flight of a projectile?

The time of flight of a projectile is the total time taken from the point at which the object is launched to the point it hits the ground. It is denoted with the symbol T.

Recall that: is the first equation of motion. Note that the time of flight is the time taken for the object to go up and down until it hits the floor. We have to consider the vertical component of the projectile motion.

To best understand the motion, we divide it into two levels. The first level covers when the object is launched from its starting point (the ground) to the maximum height. Then, the second level covers the motion from the maximum height to the point it drops to the launch level (the ground).

An illustration on the time of flight of a projectile, Njoku - StudySmarter Originals

Remember that:

T

Thus, time of flight T is:

Peter launched a rocket at an angle of 30 degrees to the horizontal. The rocket moved at a velocity of 500 m/s. Calculate:

1. The time of flight.

2. The time it takes to get to the maximum height.

Take

Solution:

1. θ = 30 °

u = 500 m / s

Time of flight is calculated as:

T = 51.02 s

1. The time it takes the rocket to reach its maximum height is t.

T = 2t

t = 25.51 s

### What is the range of a projectile motion?

The range of a projectile motion is known as the total horizontal distance travelled by the object from the point it is launched, to the point it hits the ground. R is used to represent the range. The range is calculated by finding the product of the velocity at the horizontal direction and the time of flight.

Range of a projectile, Njoku - StudySmarter Originals

R =

Remember that: = u cosθ.

Do not forget the range is the horizontal distance of the projectile.

Note that:
T =

In trigonometry: sin (2θ) = 2sinθcosθ

Thus:

As the formula in calculating the range contains 2θ it means that the highest value of the range at 45 °, which means sin (2θ) = sin90 ° = 1.

In a football match, a goalkeeper kicks a stationary ball. If the ball moves at a velocity of 27 m / s and 30 ° to the ground, calculate the range. Take g = 9.8 m / s²

Solution:

u = 27 m / s

θ = 30 °

g = 9.8 m / s²

R = 64.42 m

### What is the maximum height of a projectile?

The maximum height is the highest point the object reaches while moving upwards before it begins to drop. At the maximum height, the object suspends shortly before it starts a downward movement. At this level, the velocity is zero in the vertical direction.

An illustration of the maximum height of a projectile motion, Njoku - StudySmarter

In order to calculate the maximum height, the velocity in the vertical direction is.

Remember the equation of motion:

Where: v = 0, S = h, a = -g.

So:

Thus, the maximum height of a projectile is:

A dynamite rocket was launched with a velocity of 200 m/s at an angle of 60 degrees to the horizontal. What is the highest height attained by the dynamite? Take

Solution:

u = 200 m / s

θ = 60 °

g = 9.8 m / s²

An example of dynamite in a projectile motion, Njoku - StudySmarter Originals

h = 1530.61 m

## How to calculate projectiles using vectors

You solve projectile questions using vectors by understanding the quantities which are vectors. In this case, only the acceleration, velocity and displacement are vectors. For vector quantities, the horizontal component i and vertical component j are always represented.

An image showing vectors and their direction, Njoku - StudySmarter Originals

For a vector 5i, it means that the quantity is 5 units in the positive horizontal direction (to the right on the x-axis). But for a vector -3j, it means that the quantity is 3 units in the negative vertical direction (in a downwards direction on the y-axis).

The vector direction is given in place of an angular direction in degrees. You will be relying on the displacement and velocity equations:

v = u + at

Where S = displacement,

= initial displacement

a = acceleration

t = time,

v = final velocity and

u = initial velocity.

A tennis ball is struck by a paddle from a point K, 10m above the point O on the ground. At that instant, it moves with a velocity (4i + 7j) m/s. Eventually, it hits point M on the ground after moving freely under gravity. Take g = 9.8 m/s².

1. Determine the speed of the ball 1.8 seconds after being struck.

2. Derive a vector expression for a point S of the tennis ball which is relative to O at time t seconds.

3. Find the distance OM.

Solution:

Make a diagram of the information from the question.

An image of a tennis ball hit from the top of a building, Njoku - StudySmarter Originals

1. Refer to the equation: v = u + at

v =?

u = 4i + 7j in m/s

a = -9.8j in m/s²

because the tennis ball accelerates vertically in the opposite direction of gravity, t = 1.8 in seconds

Substitute your values into the equation:

v = 4i + 7j + (-9.8j) × 1.8

v = 4i + 7j - 17.64j

v = 4i - 10.64j

To calculate v, you need to find the resultant of the vector 4i - 10.64j. This is calculated by finding the square root of the sum of the squares of both the horizontal component 4i and vertical component 10.64j.

v =11.37 m/s

2. To derive a vector expression for a point S of the tennis ball which is relative to O at time t seconds, the following equation is used:

Here,

S =?

= 10j metres because the initial vertical displacement of the tennis ball is 10 m above the ground,

u = 4i + 7y in m/s,

t = t in seconds,

a = -9.8j in m/s²

Thus:

Bring similar vector components together to factorise:

So, the equation to determine a distance S from the point O where the tennis ball was struck is:

3. To find the displacement OM, the point M has no vertical distance since the egg hits the ground at M. So, the vertical component of the vector representation is + 0j.

Refer back to the equation derived in B – remember that it tells us how to find the displacement of any point from the origin O.

Since point M has no vertical component,

Using the general quadratic equation formula we can calculate the time t at which the tennis ball hits the ground M.

From the equation ,

a = -4.9,

b = 7

c = 10

If you substitute your values into that formula you would have values:

t = 2.31s or -0.88s.

Note that only the positive value of t is taken because a negative value would mean that the tennis ball travelled back in time.

So, t = 2.31s.

This means that the tennis ball hits the point M after 2.31 seconds. To determine the horizontal displacement OM, we would substitute the value of t in:

Do not forget that the vertical component is zero, therefore:

S = 4ti

Where t = 2.31s

S = 4 × 2.31i

S = 9.24i

Thus, the distance OM is 9.24m.

## Projectiles - key takeaways

• A projectile motion occurs when a body moves freely in air under the influence of gravity.
• It is assumed no other force acts on the object except gravity.

• Projectiles can be horizontally shot or non-horizontally shot.

• The velocity in the y-direction is given as while that of the x-direction is .

• The time of flight is the total time taken for an object to complete a projectile motion. It is given as:

• The range is the horizontal distance from the point of launch to the point the projectile strikes the ground. It is given as:

• The maximum height is the vertical distance between the peak height reached by the projectile and the ground. At the maximum height, the final velocity is zero and it is given as:

• To calculate projectiles using vectors, the horizontal and vertical components of all vector quantities must be involved. The following displacement and velocity equations are used:

A projectile in mathematics calculates the motion of an object as it moves through the air in a curved path.

Examples of projectile motion are throwing a stone, striking a ball, the movement of a rocket, the shot of a bullet from a gun, etc.

The range of a projectile is found by calculating the horizontal distance between the point of launch and the spot it hits the ground.

You solve projectiles with vectors in maths by considering the x and y-directions of quantities involved in the projectile.

Projectiles are calculated by determining the time of flight, range and maximum height.

## Final Projectiles Quiz

Question

What is a projectile?

A projectile is a particle moving on air in a curved path under the influence of the gravitational force

Show question

Question

The imaginary curved line showing the path of a projectile is known as-----

The trajectory of a projectile.

Show question

Question

Which of these is an example of a projectile motion?

The movement of a bullet from a gun.

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Question

Find the value of the velocity in the x-direction of a particle which is propelled at an angle ∅ moving with a velocity c m/s.

vₓ = ccos∅ m/s

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Question

Ike says that the time of flight of a ball thrown upwards is the same as double the time taken for the ball to reach the peak height. Is this true or false?

Ike's statement is true because the time of flight T = 2t.

Show question

Question

An arrow shot vertically upwards falls to the base after 10 seconds. How long did it take to get to its maximum height?

5 seconds

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Question

Emily is playing a game where she throws her shoe towards Taye who is to turn anti-clockwise twice before catching the shoe. If Emily throws the shoe at an angle 30 degrees to the horizontal with a velocity of 20m/s, and an anti-clockwise turn by Taye takes 2 seconds, determine if Taye catches the shoe before it hits the ground. Take g = 10m/s².

No

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Question

Kimmich wants to clear the ball from the goalpost as far as possible, at what angle would he achieve this range?

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Question

Find the distance between H, where a rocket was launched and J, the point it hits the ground if the rocket was launched at an angle 60 degrees to the vertical with a velocity of 4500m/s. Take g = 9.8m/s

2.07 × 10⁶m.

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Question

What is the magnitude of the velocity of an object projected at the maximum height?

0

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Question

What is the acceleration in the horizontal direction of a projectile under the influence of gravity?

0

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Question

A basketball is thrown towards a basketball net with a stand height of 1.8 m by a toddler 31 inches in height. If his shot is made at 70 degrees to the horizontal with a velocity of 2m/s, determine if the ball gets to the basketball rim. Take g = 9.8m/s².

No

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Question

A cannonball hits a fighter jet after 5 seconds of being shot by a cannon. If the cannonball moves at a velocity of 6000m/s, is inclined at an angle 58 degrees to horizontal and the impact with the jet is made at the maximum height, determine the vertical distance between the jet and the cannon. Find the work done by the cannon ball if the mass of the cannonball is 200kg with g =9.8m/s².

Maximum height = 1.32 × 10⁶m; Work = 2.59 × 10⁹joules.

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Question

A particle 30 meters above the ground is propelled upwards to move freely with a velocity of (3i + 5j) meters per second. At what time does it hit the ground? Find the range.

t = 3 seconds; R = 9 meters.

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