![]() A basketball is moving in projectile motion. What is true about the impact velocities (or final velocities) of these two bullets? The bullet fired from the gun will have a greater impact velocity than the dropped bullet. At the same time, another identical bullet is dropped from the same height. A bullet is fired from a gun horizontally, at a height of 1 m. Newtons 3rd Law If an object "a" exerts a force on object "b", then object "b" must exert a force of the same form on object "a", which is equal in magnitude and opposite in direction.What shape is the path that all objects in projectile motion follow? A parabolic path As an object moves in the x-y plane, which statement is true about the object's average velocity? The average velocity for some time period equals the object's displacement during that period divided by that period of time. Newtons 2nd Law To an inertial observer, the acceleration of the center of mass of a system (b) is equal to the net force acting on it divided by the inertial mass of the system. Newtons 1st Law To an inertial observer, an object that has no net external force acting on it will appear to move w a constant velocity. ![]() Newton Si unit of Force inertia resistance to such a change in motion is called Kilogram (kg) Si unit of mass net external force The sum of all external forces is called the _. always The direction of kinetic friction _ opposes the direction of slipping. acceleration? pull tension forces can only _ objects contact forces When two objects directly touch one another, then they can exert _ on each other. The average acceleration is zero mass or temperature physical quantity not described as a vector? none makes sense V3 = V1 + V2ī) V3 0 V4y > 0 Which is true? V4 = V1 + V2Į) not enough info b) V5 = 7sqrt2 What is true about V5 = -V1 + V2Į) V5 = -14 DONT Vertical components of the velocity (do, dont) depend on one another magnitude Size of any vector is unit vector A _ is a vector whose magnitude is 1 and is indicated with a "hat." Average of Magnitude of Velocity Which is equivalent to speed?Īverage of Magnitude of Velocity dynamics What gives rise to changes in motion, or in other words. In what direction is the average acceleration of the car as a result of the motion described above? ![]() At the final time the car is traveling east at 10 mph. After traveling one block north the car stops and turns right to once again head east. As the car approaches an intersection it stops and turns left to go north. The average acceleration is zero A car is initially traveling east through New York City at 10 mph. False If an object moves in one dimension with a positive component of acceleration, its speed must be increasing. True The velocity of an object can reverse direction when the acceleration of the object is constant. True The speed of an object can never be negative. True If the acceleration of an object is zero, then the average speed must be equal to the magnitude of the average velocity for the object. False The average speed of an object is always equal to the magnitude of the average velocity of the object. True The acceleration of an object can be non-zero when the speed of the object is constant. False If the velocity of an object is zero, then the acceleration of an object must also be zero. False If the initial speed of an object is zero, then the initial position of the object must be the origin. True If the initial velocity of an object is zero, then the initial speed of the object must be zero. False If the average velocity of an object is zero, then the average speed of the object must also be zero. The speed of the projectile when it hits the wall. Increases If the wall were slightly farther from where the projectile was launched (the projectile still hits it), how would that effect the following? The magnitude of the y component of the velocity of the projectile when it hits the wall. ![]() The magnitude of the x component of the velocity of the projectile when it hits the wall. Stays the same If the wall were slightly farther from where the projectile was launched (the projectile still hits it), how would that effect the following? The distance from the ground to where the projectile hit the wall. Decreases If the wall were slightly farther from where the projectile was launched (the projectile still hits it), how would that effect the following? True If V3=V1+V2, then V3−V2 is parallel to V1. ![]()
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