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Worksheets(PHYS) Formative Assessment 5.1
Total questions: 10
Worksheet time: 3hrs 30mins
A warrior is running in a straight line path. If we double both the speed and the mass of the warrior, the magnitude of warrior's momentum will increase by what factor?
2
4
8
16
An elastic rubber ball is dropped from an unknown height and hits the floor with a downward speed v. Since it is so elastic, the ball bounces back with the same speed v going upward. Which of the following statements about the bounce are correct?
The ball had the same momentum just before and just after the bounce.
The magnitude of the ball's momentum was the same just before and just after the bounce.
The ball's impulse was conserved during the bounce.
None of the above statements are correct.
Identical forces act for the same length of time on two different objects. The magnitude of the change in momentum of the lighter object is
smaller than the magnitude of the change in momentum of the larger mass, but not zero.
larger than the magnitude of the change in momentum of the larger mass.
exactly equal to the magnitude of the change in momentum of the larger mass.
zero.
A 0.200-kg baseball is dropped and reaches a speed of 1.15 m/s just before it hits the ground and bounces. It rebounds with an upward velocity of 1.00 m/s. What is the change of the ball's momentum during the bounce?
0.0300 kg • m/s upwards
0.0300 kg • m/s downwards
0.430 kg • m/s upwards
0.430 kg • m/s downwards
A trampoline extends the time of impact from 0.02 s to 0.08 s. By what factor is the average force that causes the impact reduced?
2
4
16
80
The graph in the figure shows the x component F of the net force that acts for 10 s on a 100-kg crate. What is the change in the momentum of the crate during the 5 s that this force acts?
-100 N•s
-75 N•s
-50 N•s
50 N•s
Calculate the impulse due to a force of 7.20 N that lasts for 1.50 s.
1.08 kg • m/s
10.8 kg • m/s
8.70 kg • m/s
4.80 kg • m/s
A girl of mass 55 kg throws a ball of mass 0.80 kg against a wall. The ball strikes the wall horizontally with a speed of 25 m/s and it bounces back with this same speed. The ball is in contact with the wall 0.025s. What is the magnitude of the average force exerted on the wall by the ball?
800 N
1600 N
55,000 N
27,500 N
A steady horizontal force lasting for 2.3 s gives a 1.25 kg object an acceleration of 3.2 m/s^2 on a frictionless table. What impulse does this force give to the object?
26 kg • m/s
7.4 kg • m/s
9.2 kg • m/s
1.7 kg • m/s
A 0.150 kg baseball is thrown with a speed of 30.0 m/s. If it takes 6.43 N of force for the baseball to come to rest in the catcher's glove, what is the time the catcher experiences force due to the ball?
0.07 s
0.70 s
4.71 s
28.8 s
