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GED0081 FINALS
| Question | Answer |
|---|---|
| A projectile is fired from ground level over level ground with an initial velocity that has a vertical component of 20m/s and a horizontal component of 30m/s. Using g = 10m/s2, the distance from launching to landing points is: | 120m |
| What is the unit of centrifugal force? | N |
| A stone is tied to the end of a string and is swung with constant speed around a horizontal circle with a radius of 1.5m. If it makes two complete revolutions each second, the magnitude of its acceleration is: | 24m/s2 |
| A pen and a rock are dropped vertically at the same time with the same height. Neglecting air resistance which object will hit the ground the ground first? | Both the pen and the rock |
| Natasha Romanoff is riding her bike 20 m north, then turns east and runs for another 11 m, then stops. What is her displacement? | 22.83 m, NE |
| Natasha Romanoff tossed a coin vertically upward and reaches a maximum height of 0.85 m before it comes back down. With what velocity was it thrown? | 4.08 m/s |
| Barbie is jumping up and down a trampoline, her initial velocity is 3m/s. What is her acceleration? Neglect air resistance. | 9.8m/s^2 |
| Mima Sassa likes to run everymorning. She ran 10 m north, and then 4 m south back toward her starting point. What is her distance? | 14 m |
| An object has an initial velocity of 3 m/s after 10 seconds it stopped at 25 meters distance from its initial position. What is the acceleration of the object? | -0.1m/s^2 |
| A ball player catches a ball 12.74 seconds after throwing it vertically upward. With what speed did he throw it? | 62.4m/s^2? |
| The observation deck of a building is 77.92 meters above the street. Determine the time required for a penny to free fall from the deck to the street below. | 3.98 |
| FORMATIVE 3 | !!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
| A brick slides on a horizontal surface. Which of the following will increase the magnitude of the frictional force on it? | Putting a second brick on top |
| The system shown remains at rest. Each block weighs 20N. The force of friction on the upper block is: | 8 N |
| A horizontal shove of at least 200 N is required to start moving a 800-N crate initially at rest on a horizontal floor. The coefficient of static friction is: | 0.25 |
| A crate resting on a rough horizontal floor is to be moved horizontally. The coefficient of static friction is 0.40. To start the crate moving with the weakest possible applied force, in what direction should the force be applied? | 22◦ above the horizontal |
| Two blocks are connected by a string and pulley as shown. Assuming that the string and pulley are massless, the magnitude of the acceleration of each block is: | 0.98 m/s2 |
| A horizontal force of 5.0 N pushes a 0.50-kg book against a vertical wall. The book is initially at rest. If the coefficients of friction are µs = 0.6 and µk = 0.80, the magnitude of the frictional force is: | 4N |
| A box rests on a rough board 10 meters long. When one end of the board is slowly raised to a height of 6 meters above the other end, the box begins to slide. The coefficient of static friction is: | 0.75 |
| A 70N block and a 35N block are connected by a string as shown. If the pulley is massless and the surface is frictionless, the magnitude of the acceleration of the 35N block is: | 3.3 m/s2 |
| Two blocks, weighing 250N and 350N, respectively, are connected by a string that passes over a massless pulley as shown. The tension in the string is: | 290 N |
| A mass sliding down a frictionless inclined plane has how many forces in its FBD? | 2 |
| According to Newton's third law of motion, for every action, there is an equal and opposite what? | Reaction |
| Which law of motion explains why a soccer ball keeps rolling after being kicked? | Newton's First Law |
| Which law of motion explains why a person is pushed backward when a car accelerates suddenly? | Newton's First Law |
| Which law of motion explains why a rocket propels forward by expelling gas in the opposite direction? | Newton's Third Law |
| Which law of motion explains why it is harder to push a heavy object than a light one? | Newton's Second Law |
| What is the relationship between mass and inertia? | Inertia increases with mass |
| If an object is moving at a constant speed in a straight line, what can you conclude about the net force acting on it? | The net force is zero |
| What is the role of friction in the operation of pulleys and elevators? | Friction decreases the efficiency of pulleys and elevators |
| What is the relationship between the mass of an object being lifted and the force required to lift it using a pulley system? | The force required is directly proportional to the mass |
| Which of Newton's laws is applicable to the motion of objects on an inclined plane? | All of the above |
| How does the speed of an object in uniform circular motion affect the magnitude of the centripetal force? | Higher speed requires a higher centripetal force |
| How does the presence of friction affect the motion of an object on an inclined plane? | It decreases the acceleration of the object |
| What is the role of the tension force in uniform circular motion? | It provides the centripetal force |
| How does the applied force affect the acceleration of an object on an inclined plane? | The acceleration increases as the applied force increases |
| What is the relationship between the mass of the object and its acceleration on an inclined plane? | he acceleration decreases as the mass increases |
| A 29-N crate is held at rest on a frictionless incline by a force that is parallel to the incline. If the incline is 61◦ above the horizontal, the magnitude of the applied force is ____N. | 25 |
| A 0.26-kg stone is attached to a string and swung in a circle of radius 0.6m on a horizontal and frictionless surface. If the stone makes 262 revolutions per minute, the tension force of the string on the stone is ____N. | 117 |
| FORMATIVE 4 | !!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
| A 100-N force is applied at an angle of 300 to the horizontal to move a 15 kg object at a constant speed for a horizontal distance of 5 m. How much work is done in this case? | 433 J |
| An ideal spring is hung vertically from the ceiling. When a 2.0-kg mass hangs at rest from it the spring is extended 6.0 cm from its relaxed length. A downward external force is now applied to the mass to extend the spring an additional 10 cm... | −3.6J |
| An 8-N block slides down an incline. It has an initial speed of 7m/s. The work done by the resultant force on this block is: | impossible to calculate without more information |
| A 1-kg block is lifted vertically 1m by a boy. The work done by the boy is about: | 10 J |
| Two trailers, X with mass 500 kg and Y with mass 2000 kg, are being pulled at the same speed. The ratio of the kinetic energy of Y to that of X is: | 4:1 |
| A block is attached to the end of an ideal spring and moved from coordinate xi to coordinate xf . The relaxed position is at x = 0. The work done by spring is positive if: | xi = −4 cm and xf = −2 cm ??? |
| The velocity of a particle moving along the x axis changes from vi to vf . For which values of vi and vf is the total work done on the particle positive? | vi = 5m/s, vf = 2m/s ??? |
| A kilowatt•hour is a unit of: | energy/time |
| An ideal spring is hung vertically from the ceiling. When a 2.0-kg block hangs at rest from it the spring is extended 6.0 cm from its relaxed length. A upward external force is then applied to the block to move it upward a distance of 16 cm... | −1.0J ??? |
| A tired squirrel (mass of approximately 1 kg) does push-ups by applying a force to elevate its center-of-mass by 5 cm in order to do a mere 0.50 Joule of work. If the tired squirrel does all this work in 2 seconds, then determine its power. | 0.25 W |
| What is the SI unit of work? | Joule |
| Which of the following is a scalar quantity? | Work |
| What is the definition of mechanical energy? | The energy associated with the motion of an object |
| How does the law of conservation of energy apply to a closed system? | Energy is conserved if there are no external forces acting on the system |
| What is the difference between work and power? | Work is the energy transferred over time, while power is the rate at which energy is transferred |
| A force of 10 N is applied to an object and it moves a distance of 5 m in the direction of the force. How much work is done on the object? | 50 J |
| What is the relationship between work and energy? | Energy is a measure of the ability to do work |
| Which of the following terms refers to the ability to do work? | Energy |
| Which of the following is an example of an inelastic collision? | Two cars colliding and sticking together. |
| Which of the following statements accurately describes momentum? | Momentum is a vector quantity. |
| If the net external force acting on an object is zero, what can be said about its momentum? | The momentum is constant. |
| Which of the following statements accurately describes the law of conservation of momentum? | The total momentum of a system is always constant. |
| In a collision between two objects, which of the following statements is true? | Momentum is always conserved. |
| What is the relationship between force and time in the context of impulse? | Force is inversely proportional to time. |
| How is momentum defined in physics? | Momentum is the product of an object's mass and velocity. |
| What does it mean for an object to have zero momentum? | The object is at rest. ? |
| How far must a 11 N force pull a 31 g toy car if 63 J of energy are transferred? | 5.73 |
| A crate of mass 40 kg is pushed along a floor with a force of 44 N for a distance of 4 m. Calculate the work done. | 176 |
Created by:
murphh