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10-The collision of a large truck with a wall is more destructive than the collision of a small car although they have the same velocity , that is due to in case of small car …………..
1
1
a)by increasing mass the force of collision will increase.
2
b) by increasing time of impact the force of collision will decrease.
3
c) by decreasing mass the force of collision will decrease.
4
d) by increasing acceleration the force of collision will increase.
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9-If a person falls from a height in water he will not be harmed while if he falls on the ground he will be harmed , because in case of falling in water …………………..
1
1
a)Time of impact increase
2
b)Time of impact decreases
3
c)Velocity increases
4
d)Velocity decreases
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8-The acceleration of a 5 kg object over time is shown in this graph . What is the net force at 1 s? ………..
1
1
a) -10 N
2
b) -5 N
3
c) -2.5 N
4
d) 5 N
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7-If the force acting on a body is doubled while its mass is decreased to its half , acceleration of its motion……………….
1
1
a)Decreases to its half
2
b) Increases to the double
3
c) Increases four times
4
d) Decreases to its quarter
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6-An object of mass 0.5 kg at rest , started to fall from a height of 180 cm from the surface of the Earth .Its momentum when it reaches the Earth’s surface is……………….
1
1
a) 3 kg.m/s
2
b) 5kg .m/s
3
c) 6 kg.m/s
4
d) 9 kg .m/s
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2-If the momentum of an object is doubled and its mass decreased to half, its velocity ………….
1
1
a) Doesn’t change
2
b) Decreases to half
3
c)Increases to double
4
d)Increases 4 times
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4-The opposite graph represents the relation between the momentum of a body that is affected by a force F and the time , so the force that acts on the body is ……………………………
1
1
a) Absent.
2
b) In the same direction of motion.
3
c) In the opposite direction of motion.
4
d) Perpendicular to the direction of motion.
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2-If the momentum of an object is doubled and its mass decreased to half, its velocity ………….
1
1
a) Doesn’t change
2
b) Decreases to half
3
c)Increases to double
4
d)Increases 4 times
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1-The product of multiplying mass of a body and the rate of change of its displacement is ……………..