Momentum & Collisions Calculations and Questions

Which are complete descriptions of the momentum of an object? Circle all that apply. A. 7.0 kg*m/s, right B. 2.3 kg*m/s C. 2.0 kg/s D. 1.9 kg•m/s, west

A. 7.0 kg*m/s, right D. 1.9 kg•m/s, west

After colliding, objects are deformed and lose some kinetic energy but do not stick together. Identify the type of collision. A. inelastic B. perfectly inelastic C. elastic

A. inelastic

The momentum of an object depends on the object's ________. Pick two. A. mass B. weight C. position D. velocity E. acceleration

A. mass D. velocity

Momentum is a _____ quantity. A. Vector B. Scalar

A. vector

A bullet with the mass of 5.00 x 10^-3 kg is loaded into a gun. The loaded gun has a mass of 0.52 kg. The bullet is fired, causing the empty gun to recoil at a speed of 2.1m/s. What is the speed of the bullet? A. 48 m/s B. 220 m/s C. 120 m/s D. 360 m/s

B. 220 m/s

A 4.0 kg ball has momentum of 20.0 kg x m/s. what is the ball's speed? A. 0.2 m/s B. 5.0 m/s C. 20.0 m/s D. 80.0 m/s E. none of the above

B. 5.0 m/s

Compared to a sports car moving at 30 miles per hour, the same sports car moving at 60 miles per hour has... A. cannot be determined B. twice as much momentum C. for times as much momentum D. the same momentum

B. Twice as much momentum

A 100N force is applied to a 20kg object that is initially at rest. If the force is applied for 0.5s, what is the final velocity? A. 1000 m/s B. 10 m/s C. 2.5 m/s D. 25 m/s

C. 2.5 m/s

A 2 Kg ball is thrown at 3m/s. what is the ball's momentum? A. 2 kg*m/s B. 3 kg*m/s C. 6 kg*m/s D. 9 kg*m/s E. none of the above

C. 6 kg*m/s

A(n) ______ causes and is equal to a change in momentum a. force b. impact c. impulse d. collision

C. impulse

A 6.0 x 10^-2 kg tennis ball moves at a velocity of 12 m/s. The ball is struck by a racket, causing it to rebound in the opposite direction at the speed of 18m/s. What is the change in the ball's momentum? A. -0.38 kg*m/s B. -0.72 kg*m/s C. -1.1 kg*m/s D. -1.8 kg*m/s

D. -1.8 kg*m/s

Which condition will result in the smallest change in momentum? A. a large force over a long time period B. a large force over a short time period C. a small force over a long time period D. a small force over a short time period

D. a small force over a short time period

The momentum change of an object is equal to the A. object's mass times the force acting on it B. force acting on it times its velocity C. force acting on it D. impulse acting on it E. velocity change of the object

D. impulse acting on it

The reason padded dashboards are used in cars is that they... A. decrease the impulse in a collision B. look nice and feel good C. decrease the momentum of a collision D. increase the time of impact in a collision E. increase the force of impact in a collision

D. increase the time of impact in a collision

Calculate the impulse experienced by .... A. ... a 65.8-kg halfback encountering a force of 1025 N for 0.350 seconds. B. ... a 0.168-kg tennis ball encountering a force of 126 N that changes its velocity by 61.8 m/s.

Impulse = F•t = (1025 N)•(0.350 s) = 359 N•s Impulse = ∆momentum =m•∆v = (0.168 kg)•(61.8 m/s) = 10.4 kg•m/s = 10.4 N•s

With what velocity must a 0.53-kg softball be moving to equal the momentum of a 0.31-kg baseball moving at 21 m/s?

Psoftball = Pbaseball (0.53 kg)•Vsoftball = (0.31 kg)•(21 m/s) Vsoftball = 12m/s

Insert these words into the four blanks of the sentence: mass, momentum, acceleration, time, impact, weight, impulse, and force. In a collision, an object experiences a(n) ________ acting for a certain amount of ______ and which is known as a(n) ______ ; it serves to change the ______ of the object.

force time impulse momentum

The two quantities needed to calculate an object's momentum are _____ and _____.

mass and velocity

Calculate the momentum value of ... A. ... a 2.0-kg brick moving through the air at 12 m/s. B. ... a 3.5-kg wagon moving along the sidewalk at 1.2 m/s.

p = m•v = (2.0 kg)•(12 m/s) = 24 kg•m/s p = m•v = (3.5 kg)•(1.2 m/s) = 4.2 kg•m/s