Forces And Motion Unit Test
Question: The tendency of an object to resist any change of motion is known as
Answer: inertia
Question: The amount of matter in an object
Answer: mass
Question: The greater the mass of an object,
Answer: the greater the inertia
Question: The force of gravity of a person or object at the surface of a planet
Answer: weight
Question: What is true in this situation? A book is sitting on a dashboard of a car that's stopped at a traffic light. As the car starts to move forward, the book slides off the dashboard.
Answer: The object had inertia
Question: The law of universal gravitation states that
Answer: two objects always exert gravitational forces on each other
Question: A force that one surface exerts on another when the two rub against each other
Answer: friction
Question: According to Newton's Third Law of Motion, when a hammer strikes and exerts a force on a nail, the nail
Answer: exerts and equal and opposite force back on the hammer
Question: An example of Newton's Third Law in action
Answer: A rocket taking off from earth which pushes gasses in one direction and the rocket in the other
Question: An example of Newton's Second Law in action
Answer: A rocket that is accelerating through space and exerts a great amount of force because its mass and acceleration is so large
Question: An example of Newton's First Law in action
Answer: A rocket sitting on the ground preparing for takeoff but it needs an outside force to overcome its inertia of a nonmoving object
Question: An example of momentum in action
Answer: A bowling ball hitting pins
Question: You can increase the momentum of an object by
Answer: By increasing its mass or velocity
Question: An example of a balanced force
Answer: a tug-of-war game in which no one wins
Question: An example of an unbalanced force (net force)
Answer: a roller coaster going down the first drop
Question: In physical science, a push or pull is called
Answer: a force
Question: When two equal forces act on the same object in opposite directions, the net force is ________.
Answer: zero
Question: The word "acceleration" means to
Answer: change the speed or direction
Question: An example of a constant speed
Answer: A car cruising on the Interstate
Question: Two main outside forces acting on most anything on earth are
Answer: friction and gravity
Question: A roller coaster climbing the first hill is an example of
Answer: building potential energy
Question: A roller coaster going down the first drop is an example of
Answer: kinetic energy
Question: The force that pulls falling objects to Earth is called
Answer: gravity
Question: A car of a roller coaster coasts from point A to point B. The speed of the car increases because
Answer: unbalanced forces act on the car
Question: The force that opposes motion between the car's wheels and the track of the roller coaster
Answer: friction
Question: Which of Newton's Laws would allow a passenger to fly right out of his seat if he did not have a lap belt over him and the roller coaster suddenly stopped?
Answer: First law - "Once in motion..."
Question: Your body bouncing back into your seat after hitting the lap bar is an example of which of Newton's Laws in action?
Answer: Third law - "For every action there is an..."
Question: The amount of force of the passenger as he hits the lap bar is an example of which of Newton's Laws in action?
Answer: Second law - "Mass x acceleration =..."
Question: 2.56 m/sec is a measure of
Answer: velocity or speed
Question: 2.7 km/sec squared is a measure of
Answer: acceleration
Question: 52 kg * m/sec is a measure of
Answer: momentum
Question: 786 N is a measure of
Answer: force
Question: When energy is stored it is called
Answer: potential
Question: What is energy called when it is released
Answer: kinetic
Question: What is the speed of a free-falling object on the 2nd second?
Answer: 19.6 m/sec
Question: The definition of weight
Answer: A gravitational force on a mass
Question: A sprinter runs the 200m in a time of 15 seconds. What is the sprinter's speed?
Answer: 13 1/3 m/s
Question: A 500 kg car is moving at a velocity of 50 km/hr north. What is the car's momentum?
Answer: 25,000 kg*km/hr
Question: A free fall coaster reaches a speed of 25 m/s after 1.2 seconds. What is it's acceleration?
Answer: 20.83 m/s squared