Linear momentum is a vector quantity that has the same direction as the velocity of the object. If a direction is not given in a problem, assume that the object is moving in the positive direction.
The change in linear momentum is called impulse.
The total momentum of a system before a collision is equal to the total momentum of the system after collision. This statement is known as the law of conservation of linear momentum. It applies to all collisions as long as the net external force acting on the system is zero.
Linear Momentum and Impulse Problems:
1) Calculate the momentum of a 50 g bullet travelling at 200 m/s
2) Determine the mass of a car that is travelling eastbound at 72 km/h with a momentum of 9.0 x 10⁴ kg·m/s
3)The average accelerating force exerted on a 2.00 kg shell in a gun barrel is 1.00 x 10⁴ N, and the muzzle velocity is 200 m/s. Calculate:
a) the impulse on the shell. [400 kg m/s]
b) The length of time it takes for the shell to exit the heavy gun barrel. [4.00 x 10⁻² s]
4) A) What velocity will a 300 kg snowmobile acquire if pushed from rest by a force of 6240 N for 1.25 s?
B) What average force will stop this snow-mobile from moving at this speed in 1.25 s? [ 26.0 m/s,- 6.24 x 10³ N]
Conservation of Linear Momentum Problems:
1) A pool ball of mass 0.165 kg, moving at 8.2 m/s, hits an identical pool ball, which is at rest. If the first ball continues to move at 3.0 m/s in the forward direction, find the velocity of the second ball
2) Find the velocity of the second ball if the first ball in Problem 1 rebounds at 1.2 m/s.
3) If the second ball is moving at 2.0 m/s in the same direction as the original ball, find its (second ball) final velocity after being hit by ball 1 in Problem 1)
4) A shell of mass 7.0 kg leaves the muzzle of a cannon with a horizontal velocity of 490 m/s [right]. Find the recoil velocity of the cannon if its mass is 700 kg
Sumber: Igor_ Heimbecker, Brian Nowikow-Physics. Concepts and Connections [textbook]-Nelson Thomson Learning (2002)
The change in linear momentum is called impulse.
The total momentum of a system before a collision is equal to the total momentum of the system after collision. This statement is known as the law of conservation of linear momentum. It applies to all collisions as long as the net external force acting on the system is zero.
Linear Momentum and Impulse Problems:
1) Calculate the momentum of a 50 g bullet travelling at 200 m/s
2) Determine the mass of a car that is travelling eastbound at 72 km/h with a momentum of 9.0 x 10⁴ kg·m/s
3)The average accelerating force exerted on a 2.00 kg shell in a gun barrel is 1.00 x 10⁴ N, and the muzzle velocity is 200 m/s. Calculate:
a) the impulse on the shell. [400 kg m/s]
b) The length of time it takes for the shell to exit the heavy gun barrel. [4.00 x 10⁻² s]
4) A) What velocity will a 300 kg snowmobile acquire if pushed from rest by a force of 6240 N for 1.25 s?
B) What average force will stop this snow-mobile from moving at this speed in 1.25 s? [ 26.0 m/s,- 6.24 x 10³ N]
Conservation of Linear Momentum Problems:
1) A pool ball of mass 0.165 kg, moving at 8.2 m/s, hits an identical pool ball, which is at rest. If the first ball continues to move at 3.0 m/s in the forward direction, find the velocity of the second ball
2) Find the velocity of the second ball if the first ball in Problem 1 rebounds at 1.2 m/s.
3) If the second ball is moving at 2.0 m/s in the same direction as the original ball, find its (second ball) final velocity after being hit by ball 1 in Problem 1)
4) A shell of mass 7.0 kg leaves the muzzle of a cannon with a horizontal velocity of 490 m/s [right]. Find the recoil velocity of the cannon if its mass is 700 kg
Sumber: Igor_ Heimbecker, Brian Nowikow-Physics. Concepts and Connections [textbook]-Nelson Thomson Learning (2002)
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