12 Questions
Which of the following activities is NOT associated with projectile motion?
Mopping the floor while cleaning the house
What does the height of a projectile represent in a trajectory diagram?
The vertical distance traveled by the projectile
What are the horizontal and vertical accelerations of a projectile at its maximum height, neglecting air resistance?
The horizontal acceleration is zero and the vertical acceleration is -9.8 m/s2
At what angle should an object be thrown to achieve the maximum range, neglecting air resistance?
45o
What is the relationship between the angle of release and the height of a projectile?
The greater the angle of release, the higher the height of a projectile
How does the angle of release affect the range of a projectile?
The range is maximum at 45o
At what angle of release can the maximum range be attained in projectile motion?
45o
What must a beginner in playing basketball do to throw the ball to reach the ring?
Position the hand in a 45o angle before shooting the ball
What is the definition of impulse?
A force applied to an object for a period of time
Why did Car A cause greater damage to the tree than Car B?
Car A was moving faster
How can you catch a raw egg without breaking it?
Move the hands backwards when the egg starts touching your hands
What is the momentum of the two cars after collision if its momentum before collision is 50 kg m/s?
0 kg m/s
Study Notes
Projectile Motion
- Watering plants using a hose is an example of projectile motion at home.
- Throwing garbage on a trash basket and water coming out from a shower are also examples of projectile motion.
- Mopping the floor is not an example of projectile motion.
Projectile Motion Diagrams
- H represents the height of a projectile motion.
- Range is not represented by H.
Projectile Motion Characteristics
- At the maximum height of a projectile, the horizontal acceleration is zero and the vertical acceleration is -9.8 m/s².
- The angle of release affects the range of a projectile motion, with the maximum range attained at an angle of 45°.
Optimal Angle of Release
- The optimal angle to throw an object the farthest is 45°.
- If the angle of release is less than 45°, the range of the projectile motion decreases.
- If the angle of release is greater than 45°, the range of the projectile motion also decreases.
Relationship between Angle of Release and Height
- The angle of release affects the height of a projectile motion, with a greater angle of release resulting in a higher height.
- The height of a projectile motion is not affected by the angle of release if it is less than 45°.
Angle of Release and Range
- If the angle of release is 45°, the range of the projectile motion is maximum.
- If the angle of release is not 45°, the range of the projectile motion decreases.
Impulse and Momentum
- Impulse is the change in momentum of an object.
- Momentum is the product of mass and velocity.
- A body at rest has zero momentum.
Momentum and Collisions
- If two objects collide, the object with the greater momentum will cause more damage.
- The momentum of two objects after collision is not affected by their initial momentum.
Catching Objects
- To catch a raw egg without breaking it, you should move your hands backwards when the egg starts touching your hands.
Test your understanding of projectile motion with these questions about trajectories, velocities, and accelerations. From daily activities at home to angled launches, see how well you grasp this fundamental physics concept.
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