Physics
Summer term 2026
IFP
Exercise 1
1.1
A cue hits a stationary billiard ball (200 g) with an average force of 50 N for 10 ms. How fast is the
ball moving immediately after the impact?
1.2
A bullet with a mass of 6 g leaves the barrel of a gun at a speed of 320 m/s. The barrel of the gun has
a length of 8 cm. Assume a constant acceleration of the bullet in the gun barrel.
a) Calculate the momentum and the acceleration of the bullet.
b) What is the recoil velocity of the gun (m = 960 g)?
c) How much force is exerted on the shooter’s hand when he absorbs the recoil in 3 ms?
1.3
Two objects with masses of m1 = 5 kg and m2 = 3 kg move towards each other with velocities of
v1 = 10 m/s and v2 , respectively. After a perfectly inelastic collision, the now connected objects move
with the velocity of u = −2 m/s. Calculate the velocity of object 2 before the collision and the
deformation energy!
1.4
A boy (52kg) jumps onto his resting skateboard (4 kg) at full speed (7 m/s).
a) At what speed does he start riding the board?
b) What percentage of the kinetic energy is lost when jumping on the board (neglect the height
difference)?
1.5
Two objects with masses m1 and m2 move in the same direction at velocities v1 = 4 m/s and v2 =
10 m/s. They collide completely inelastically. After the collision, the velocity is u = 6 m/s. The loss of
kinetic energy is 72 J. Calculate the masses of the two objects!
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