Each object experiences the same force (Newton's third law) for the same amount of time, leading to the same impulse, and subsequently the same momentum change.
In any collision, there are always four quantities which are the same for both objects involved in the collision. impulse on both the block and the expert's hand have the same magnitude.force on both the block and the expert's hand have the same magnitude.time of impact on both the block and the expert's hand is the same.During the collision between her hand and the block, the _. During a talent show, she executes a swift blow to a cement block and breaks it with her bare hand. Thus, for the same collision time, bouncing involves a greater velocity change, a greater momentum change, and therefore a greater impulse.ĩ. If the ball bounces, then there is an additional velocity change sending the ball back upwards opposite the original direction. This decrease in velocity constitutes the first portion of the velocity change. Upon collision with the ground, the velocity will have to be reduced to zero - that is, the ball will cease moving downwards. Since being dropped from the same height, the balls will be moving with the same pre-collision velocity (assuming negligible air resistance). For the same collision time, impulses are smaller when the most bouncing take place. TRUE or FALSE: A ball is dropped from the same height upon various flat surfaces. So for the same speed, a doubling of mass leads to a doubling of momentum.Ĩ. Momentum is directly related to the mass of the object. If it moves at the same speed but has twice as much mass, its momentum is _. A truck driving along a highway road has a large quantity of momentum. It matters not whether the object is of large mass or small mass, moving with constant speed or accelerating if the object is MOVING, then it has momentum!ħ. An object has momentum if it has its mass in motion. Momentum can be thought of as mass in motion. The high school building rests in the middle of town. A Yugo (a compact car) is moving with a constant speed.ĭ. A small flea walking with constant speed across Fido's back.Į. A UPS truck is stopped in front of the school building.Ĭ. An electron is orbiting the nucleus of an atom.ī. Which of the following objects have momentum? Include all that apply.Ī. Momentum and Collisions - Home || Printable Version || Questions with LinksĪnswers to Questions: All || #1-5 || #6-36 || #37-56 || 57-72Ħ. Support Reactions - Equilibrium - Static equilibrium is achieved when the resultant force and resultant moment equals to zero.The Review Session » Momentum and Collisions » Answers Q#6-36 Momentum and Collisions Review.Rolling Resistance - Rolling friction and rolling resistance.Projectile Range - Calculate the range of a projectile - a motion in two dimensions.Kinetic Energy - Energy possessed by an object's motion is kinetic energy.Jet Propulsion - Calculate the propulsive discharge force or thrust induced by an incompressible jet flow.Impact Force - Impact forces acting on falling objects hitting the ground, cars crashing and similar cases.Formulas of Motion - Linear and Circular - Linear and angular (rotation) acceleration, velocity, speed and distance.Force Ratio - The force ratio is the load force versus the effort force.Flywheels - Kinetic Energy - The kinetic energy stored in flywheels - the moment of inertia.Speed and Time - Calculator and Chart - Velocity plotted in time used diagram. Conservation of Momentum - The momentum of a body is the product of its mass and velocity - recoil calculator.Car - Required Power and Torque - Power, torque, efficiency and wheel force acting on a car.Angular Motion - Power and Torque - Angular velocity and acceleration vs.Mechanics - Forces, acceleration, displacement, vectors, motion, momentum, energy of objects and more.Dynamics - Motion - velocity and acceleration, forces and torque.Then the velocity of the car after 10 s can be calculated as The impulse - or change in momentum - can be calculated I = impulse (N s) Example - resulting Velocity after an Acting ForceĪ force 1000 N is acting on a car with mass 1000 kg in 10 second. The impulse is equal to the change of momentum caused by the impulsive force and can be expressed as The product of the impulsive force and the time it acts is called the impulse. (1) can alternatively be expressed asĬhange in momentum is force times acting time.įorces that act for a very short time are called impulse forces. According to Newton's Second Law of Motion - force can be expressed asĭM = change of momentum (kg m/s, lb ft/s)Įq.