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Terms in this set (50)Whether a truck comes to a stop by crashing into a haystack or a brick wall, the impulse is both the same Padded dashboards in cars are safer in an accident than non-padded ones because passengers hitting the dashboard encounter
lengthened time of contact A heavy truck and a small car rolling down a hill at the same speed are forced to stop in the same amount of time. Compared with the force that stops the car, the force needed to stop the truck is Greater When Peter tosses an egg against a sagging sheet, the egg doesn't break due to neither of these True or False; When two objects collide and completely bounce apart with no lasting deformation or generation of heat, the collision is said to be elastic. true Recoil is noticeable if we throw a heavy ball while standing on roller skates. If instead we go through the motions of throwing the ball but hold onto it, our net recoil will be zero True or False; Impulse is defined as the force exerted on an object times the time it lasts. true To catch a fast-moving ball, you extend your hand forward before contact with the ball and let it ride backward in the direction of the ball's motion. Doing this reduces the force of contact on your hand principally because the time of contact is increased The speed of a 4-kg ball with a momentum of 12 kg m/s is 3 m/s When Freddy Frog drops vertically from a tree onto a horizontally-moving skateboard, the speed of the skateboard decreases A cannon recoils while firing a cannonball. The speed of the cannon's recoil is relatively small because the cannon has much more mass than the cannonball. A softer landing occurs when a falling object bounces from a surface in a extended time Which produces more force: driving into a very massive concrete wall with no "give," or having a head-on collision with an identical car moving toward you at the same speed? both the same An astronaut floating alone in outer space throws a baseball. If the ball moves away at 20 m/s, the astronaut will move in the opposite direction at a lower speed True or False; When a baseball player follows through in hitting the ball, the contact time with the ball is longer. true True or False; Automobile dashboards that are padded lengthen the time of impact in case of a collision. true True or False; Momentum is a scalar quantity. false True or False; Perfectly elastic collisions between large objects are uncommon in the everyday world. true Which has the greater momentum when moving? either of these depending on speed true or false; When two objects collide and stick together, the collision is said to be inelastic. true A karate chop is more effective if one's hand bounces upon impact The total momentum of a flock of identical birds could be zero only if the birds are flying in different directions True or False; If the net external force acting on a system is zero, then the total momentum of the system is zero. false When a boxer moves into an oncoming punch, the force experienced is increased When you jump from an elevated position you usually bend your knees upon reaching the ground, which makes the time of the contact about 10 times that of a stiff-legged landing. In this way the average force your body experiences is about 1/10 as great true or false; Impulses are normally smaller when bouncing takes place. false When bullets are fired from an airplane in the forward direction, the momentum of the airplane is decreased A car traveling along the highway brakes to a stop over a certain distance. More braking force is required if the car has all of the above A tiny gun made of a strong but very light material fires a bullet more massive than the gun itself. For such a weapon the target would be safer than the shooter It is correct to say that impulse is equal to a corresponding change in momentum Which of the following has the largest momentum relative to Earth's surface? a pickup truck speeding along a highway true or false; If the net external force acting on a system is zero, then the total momentum of the system is zero. false When a boxer is moving away from a punch, the force experienced is reduced because the time of contact is increased A same-size iron ball and wooden ball are dropped simultaneously from a tower and reach the ground at the same time. The iron ball has a greater momentum true or false; Momentum is defined as an object's mass times its velocity. true true or false; When two objects collide and completely bounce apart with no lasting deformation or generation of heat, the collision is said to be elastic. true when a boxer is moving away from a punch, the force experienced is reduced because the time of contact is increased You're driving down the highway and a bug spatters into your windshield. Which undergoes the greater change in momentum during the time of contact? both the same A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is twice Whether a truck comes to a stop by crashing into a haystack or a brick wall, the stopping force is greater with the brick wall A large heavy truck and a small baby carriage roll down a hill. Neglecting friction, at the bottom of the hill, the baby carriage will likely have less momentum The average braking force of a 1000-kg car moving at 10 m/s braking to a stop in 5 s is 2000N True or False; Impulses are normally smaller when bouncing takes place. false The force that accelerates a rocket in outer space is exerted on the rocket by the exhaust gases If several balls are thrown straight up with different initial speeds, the quantity that will have the same value along their paths is their acceleration The force on a dropped apple hitting the ground depends upon all of the above Freddy Frog drops vertically from a tree onto a horizontally-moving skateboard. The reason he doesn't slip off the skateboard is due to friction between his feet and the board The impulse-momentum relationship is a direct result of Newton's 2nd law True or False; Momentum is defined as an object's mass times its velocity. true Whether a truck comes to a stop by crashing into a haystack or a brick wall, the stopping force is greater with the brick wall Sets with similar termschapter 6 physics29 terms Taylor_137 Physics chapter 6 Cuellar37 terms janelly_saucedo Physics Chapter 6 Test85 terms nampani Sets found in the same folderphysics145 terms camodel6PLUS Physics 2020 M5 Homework25 terms frozenfurys Physics Chapter 745 terms samantha_fridley9 Physics Final Review Vocab142 terms cmaughon Other sets by this creatorWorld War II Final31 terms gibbotay000 world history test56 terms gibbotay000 chapter 23 redo30 terms gibbotay000 physics final vocab58 terms gibbotay000 Verified questions
PHYSICS A compact disc rotates at 500 rev/min. If the diameter of the disc is 120 mm, (a) what is the tangential speed of a point at the edge of the disc? (b) At a point halfway to the center of the disc? Verified answer
PHYSICS A 10.0-kg monkey climbs a uniform ladder with weight $1.20 \times 10^{2} \mathrm{N}$ and length L = 3.00 m. The ladder rests against the wall and makes an angle of $\theta=60.0^{\circ}$ with the ground. The upper and lower ends of the ladder rest on frictionless surfaces. The lower end is connected to the wall by a horizontal rope that is frayed and can support a maximum tension of only 80.0 N (a) Draw a force diagram for the ladder. (b) Find the normal force exerted on the bottom of the ladder. (c) Find the tension in the rope when the monkey is two-thirds of the way up the ladder. (d) Find the maximum distance d that the monkey can climb up the ladder before the rope breaks. (e) If the horizontal surface were rough and the rope were removed, how would your analysis of the problem change? What other information would you need to answer parts (c) and (d)? Verified answer
PHYSICS A point charge $q _ { 1 } = 4.00 \textrm{ nC}$ is placed at the origin, and a second point charge $q _ { 2 } = - 3.00 \textrm{ nC}$ is placed on the x-axis at $x = +20.0 \textrm{ cm}$. A third point charge $q _ { 3 } = 2.00 \textrm{ nC}$ is to be placed on the x-axis between $q _ { 1 }$ and $q _ { 2 }$. (Take as zero the potential energy of the three charges when they are infinitely far apart.) (a) What is the potential energy of the system of the three charges if $q _ { 3 }$ is placed at $x = +10.0 \textrm{ cm}$? (b) Where should $q _ { 3 }$ be placed to make the potential energy of the system equal to zero? Verified answer
PHYSICS A hockey player hits a puck with his stick, giving the puck an initial speed of 5.0 m/ s. If the puck slows uniformly and comes to rest in a distance of 20 m, what is the coefficient of kinetic friction between the ice and the puck? Verified answer Other Quizlet setsHDFS final specific questions33 terms lils204 Romanticism Midterm Part 217 terms samantha_jean_baz The Peripheral Nervous System19 terms celeah_barlow Chapter 22 Respiratory System65 terms ronronmad Related questionsQUESTION a ufo has a mass of 99,000 kg. that thrust for each of eight engines is 75,000 N. what is the ufo's acceleration when taking off? 2 answers QUESTION An electric field is actually a 4 answers QUESTION Just as in hydraulic circuits there is water pressure, in electric circuits there is 15 answers QUESTION When a star undergoes a supernova explosion, the total energy of the universe 4 answers Is the impulse the same for hitting a wall or a haystack and coming to a stop?Impulse Changes Momentum
– When a car is out of control, it is better to hit a haystack than a concrete wall. Physics reason: Same impulse either way, but extension of hitting time reduces the force.
When two vehicles collide momentum is conserved?The law of momentum conservation can be stated as follows. For a collision occurring between object 1 and object 2 in an isolated system, the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision.
Is it correct to say that impulse is equal to?The impulse-momentum relationship states that the impulse delivered by the net force acting on an object is equal to the change in the momentum of that object.
What is the relationship between an impulse on an object and the change in momentum of that object?The impulse experienced by the object equals the change in momentum of the object. In equation form, F • t = m • Δ v. In a collision, objects experience an impulse; the impulse causes and is equal to the change in momentum.
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Whether a truck comes to a stop by crashing into a haystack or a brick wall, the impulse is
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