Which of the following best describe the meanings of projectile?, An object that moves through the air after it is thrown., An object that stays in one place on the ground., An object that moves only on a flat surface., An object that moves only because of friction., The horizontal and vertical motions of a projectile are ______., always opposite, exactly the same, different from each other, always equal, While going up, the vertical speed of a projectile:, Decreases, Increases, Stays the same, Becomes horizontal, What is horizontal distance called?, Gravity, Height, Speed, Range, What happens to the vertical velocity of a projectile at the highest point?, It stops the motion completely., It becomes very large., It becomes equal to the horizontal velocity., It becomes zero., What shape is the path of a projectile?, Straight line, Curved path, Square shape, Zigzag path, What is the maximum vertical distance called?, Height, Range, Gravity, Time, A projectile thrown at 45° will:, Go straight up, Have the maximum horizontal distance, Go straight down, Move horizontally only, What happens to the vertical motion when the projectile goes down?, It slows down because of gravity., It speeds up because of gravity., It remains constant., It becomes zero., A person riding a bicycle hits a tree at moderate speed. How can injuries be reduced?, Stopping the bike suddenly, because sudden stops prevent injuries., Riding faster, because speed reduces collision time., Wearing a helmet, because it increases the time of impact and reduces force., Wearing lighter clothes, because clothes absorb force., A student launches a projectile at 20°, 45°, and 70° with the same speed. Which angle will most likely produce the greatest horizontal range?, 20° because the projectile moves mostly forward., 45° because it balances vertical and horizontal motion., 70° because the projectile moves mostly upward., 90° because the projectile moves only upward., A car moving at high speed hits another car. Why does the fast-moving car cause greater damage during the collision?, Because the car loses its velocity., Because the car has less mass., Because the car has less impulse., Because the car has greater momentum., Two cars collide head-on. One car is heavier than the other. Which car has greater momentum if both have the same speed?, The heavier car has greater momentum., The lighter car has greater momentum., Both cars have zero momentum., Both cars have equal momentum., What is mechanical energy?, Energy produced only by machines, Energy stored only in batteries, Energy due to motion and position of an object, Energy found only in electricity, Mechanical energy is made up of which two types of energy?, Chemical energy and sound energy, Heat energy and light energy, Potential energy and kinetic energy, Electrical energy and nuclear energy, Which event does NOT describe potential energy being changed into kinetic energy?, A box sliding down a ramp, A mango falling from a crate, A stretched rubber band got loosened, A skater at the top of the mountain, What type of energy does a moving object have?, Kinetic energy, Potential energy, Chemical energy, Thermal energy, What type of energy does an object have because of its position?, Potential energy, Kinetic energy, Sound energy, Electrical energy, Two ice skaters, Anna and Ben, stand facing each other on a smooth ice rink. They push off and move in opposite directions. Which is true about their total momentum?, It disappears after they push., It stays the same before and after they push., It becomes larger after they push., It depends on who is heavier., When a ball is at the top of a hill, what kind of energy does it have?, Sound energy, Kinetic energy, Electrical energy, Potential energy, A child slides down a playground slide. What happens to the child’s mechanical energy?, Potential energy changes into kinetic energy, Kinetic energy changes into potential energy, Mechanical energy disappears completely, Mechanical energy changes into sound only, When a skateboarder moves up a ramp and slows down, what happens to the energy?, Potential energy changes into kinetic energy, Kinetic energy changes into potential energy, Mechanical energy becomes heat energy only, All energy disappears completely, Which of the following illustrates the direct transformation of potential to kinetic energy?, A basketball player catches a flying ball, Kathy’s arrow is released from its bow, A kalesa slowly starting to move forward, The spring mechanism of a toy is rotated until it locked, A motorcyclist wears protective gear and slides after a crash. How does the gear help reduce injuries?, It removes the friction between the rider and the road surface, It makes the impact happen more slowly, so the force is smaller, It pushes the rider backward to avoid injury from the crash, It stops the motorcycle instantly to reduce force on the rider, A ball is kicked with an initial velocity of 35 m/s at an angle of 65° above the horizontal. What is the horizontal range of the projectile?, 89.10 m, 89.01 m, 98.10 m, 98.01 m, Find the momentum of a bumper car if it has a total mass of 56 kg and a velocity of 12 m/s., 672 kg.m/s, 627 kg.m/s, 670 kg.m/s, 607 kg.m/s, Calculate the ball’s momentum, if a 7 kg ball accelerates at a rate of 23 m/s., 116 m, 161 m, 611 m, 160 m, A cart has a momentum of 30 kg·m/s and a mass of 6 kg. What is its velocity?, 3 m/s, 4 m/s, 5 m/s, 6 m/s, A runner has a momentum of 72 kg·m/s and runs at 6 m/s. What is the runner’s mass?, 10 kg, 11 kg, 12 kg, 13 kg, A basketball player throws a ball at 12 m/s at an angle of 50°. Find the maximum height of the ball., 12.94 m, 13.94 m, 14.94 m, 15.94 m

Summative Test Grade 9

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