MOTION UAM G-9

Instructions: Read each question carefully and SELECT the correct answer.

1. Projectile motion is a form of motion experienced by an object or particle projected into the air. Which of the following solely affects the motion of the object for it be called a projectile?

• MASS

• GRAVITY

• CONTACT FORCE

• AIR RESISTANCE

2. 2. An object moves along a straight line and its velocity increases by an equal amount in an equal interval of time. Which of the following correctly describes the motion of the object?

• Uniform Motion

• Accelerated Motion

• Uniform Velocity Motion

• Uniformly Accelerated Motion

If a free-falling ball is equipped with a speedometer, by how much would its speed-reading increase for every second?

• A. 0 m/s

• 8.9 m/s

• C. 9.8 m/s

• 10.8 m/s

4. A sepak takraw ball is hit vertically upward by a player. What is its acceleration after 1 second?

• 0 m/s²

• 1 m/s²

• 9.8 m/s²

• -9.8 m/s²

4. If the gravitational acceleration on the moon is 1/6th that of earth, how does the time of fall on the moon differ from that of the Earth?

• A. The object will fall for a longer time on the moon.

• B. The object will fall for a shorter time on the moon.

• C. The time of fall of an object in the moon cannot be determined.

• D. The object will fall at the same time both on Earth and on the moon.

Zed is playing a ball on top of a building but the ball falls and hits the ground after 2.6 seconds. What is the final velocity of the ball just before it hits the ground and how high is the building?

• -23 m/s, 30 m

• -24 m/s, 31 m

• -25 m/s, 32 m

• -26 m/s, 33 m

A horizontally-launched projectile glides through the air and gains speed. In what direction does it accelerate?

• Vertically only

• Horizontally only

• Both vertically and horizontally

• Neither vertically nor horizontally

A projectile is released at an angle above the horizontal. In the absence of air resistance, at what angle of projection the maximum range of a projectile is greatest?

projectile is an object upon which the only force acting is gravity. Which of the following is an example of a projectile?

• A spinning top

• A descending airplane

• A javelin being thrown from the level ground

• A man riding in a basket under a hot air balloon

Gravity is the downward force upon a projectile that influences its vertical motion. How does gravity affect the trajectory of a projectile?

• It decreases its horizontal acceleration.

• It influences its vertical motion and causes a parabolic path.

• It increases the height the projectile can obtain.

• It creates a force that keeps the projectile at constant horizontal velocity.