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Shouq Alshahrani ID #201100972
Ghada Alnajrani ID #201101132
Nouf Al-ibrahim ID #201100937
Sara Al-Gosaibi ID #201000987
Nouf Abu nhaya ID #201001912
Sara Almesned ID #201000520
Fill in the blank = 10 questions
Equations = 10 questions
Definitions = 10 questions
MCQ 1 = 10 questions
MCQ 2 = 10 questions
MCQ 3 = 5 questions
Total : 55
QUESTIONS
Fill in the blank:
1- The unit of mass is …………
2- The unit of weight is …………
3- What is the newton law that called the law of action and reaction ….……
4- Law of ……… …… … in the absence of an external force, the momentum of a system
remains unchanged.
5- Mass is most closely related to …………
6- When your mass increases, your weight …………
7- A mosquito has a collision with the windshield of massive high-speed truck. The force of
impact on the mosquito is ………… the force on the truck and the acceleration of the
mosquito is ………… the deceleration of the truck.
8- …… …… is the force upon an object due to gravity
9- What is the newton law that called the law of acceleration …………
10- Momentum in motion means …………
Equations:
1) One pound is the same as 4.45 newtons. What is the weight in pound of 2 newtons?
2) If you weigh 500 N, what is your mass?
3) What force will produce an acceleration of 7 m/s2, in a body of mass 21 kg?
4) Calculate the mass of an object when a force of 900 N produces an acceleration of 10
m/s2.
5) If raindrops fall vertically at a speed of 3 m/s and you are running at 4 m/s, how fast do
they hit your face?
6) What is the momentum of a 20 kg cannon shell going 420 m/s?
7) What is the impulse imparted by a rocket that exerts 5.2 N for 1.74 seconds?
8) How much impulse is needed to stop a 20 kg bowling ball moving at 5 m/s?
9) What is the change in momentum of a 950 kg car that travels from 40 m/s to 30 m/s?
10) A 5 kg fish swimming 1 m/s swallows an absentminded 1 kg fish swimming toward it at
a speed that brings both fish to a halt immediately after lunch. Show that the speed of the
approaching smaller fish before lunch must have been 5 m/s.
Definitions:
1. The quantity of matter in an object. It is also the measure of the inertia or sluggishness
that an object exhibits in response to any effort made to start it, stop it, or change its state
of motion in any way .................
2. The force upon an object due to gravity …………….
3. The acceleration produced by a net force on an object is directly proportional to the net
force, is in the same direction as the net force, and is inversely proportional to the mass of
the object ……………
4. Whenever one object exerts a force on a second object, the second object exerts an equal
and opposite force on the first …………..
5. Has magnitude and direction and represented by an arrow ………
6. A property of moving things ………
7. Product of force and time ...........
8. Impulses are generally greater when objects bounce …………
9. In the absence of an external force, the momentum of a system remains unchanged
………
10. occurs when colliding objects rebound without lasting deformation or any generation of
heat …………
MCQ 1:
1. A force interaction requires at least
a. one force.
b. two forces.
c. an action force.
d. a reaction force.
2. Earth pulls on the Moon with a certain force. Relative to this force, the pull of the Moon
on Earth is
a. a little less.
b. the same.
c. a little greater.
d. much less.
3. If action is a foot kicking a soccer ball, the reaction is an equal force on the
a.
ball.
b.
foot.
c.
ground.
d.
air drag of motion.
4. Two identical carts have a compressed spring between them. When the spring is released,
the carts recoil from each other with oppositely directed accelerations that are
a.
almost equal.
b.
equal.
c.
unequal.
d.
zero.
5. An axe is swung against a tree with a blow of 4000 N. The force that acts on the axe
during this event is
a. less than 4000 N.
b. 4000 N.
c. greater than 4000 N.
d. 0.
6. When a farmer throws a 3-kg pumpkin at a speed of 4 m/s onto a compost pile, the
pumpkin’s momentum just before hitting the pile is
a.
0 kg•m/s.
b.
5 kg•m/s.
c.
7 kg•m/s.
d. 12 kg•m/s.
7. When both the force and time of contact are doubled, the impulse on an object is
a. unchanged.
b. doubled.
c. quadrupled.
d. decreased.
8. Your friend says that impulse equals momentum. Your friend’s statement is not correct,
and the missing word is
a. work.
b. acceleration.
c. speed or velocity.
d. change.
9. Standing still on a skateboard, you catch a ball tossed horizontally to you. The mass of the
ball is one-tenth your mass. Compared with the speed of the caught ball, the speed that both
you and the caught ball acquire is
a. the same.
b. one-tenth as much.
c. 10 times as much.
d. 100 times as much.
10. When Jake tosses a ball while standing still on his skateboard, he and his skateboard
recoil. If he goes through the motions of tossing the ball, but doesn’t toss it, his net recoil will
ideally be
a.
the same as if he threw the ball.
b.
almost as much as if he threw the ball.
c.
very small.
d.
zero.
MCQ 2:
1- Mass is most closely related to:
a. Inertia.
b. Weight.
c. Volume.
d. Location.
2- When your mass increases, your weight:
a. May remain the same.
b. Increases.
c. Decreases.
d. Transforms to greater volume.
3- If the mass of an object is halved, the weight of the object is:
A. Halved.
B. Twice.
c. Depends on location.
D. None of the above.
4- As the skydiver falls faster and faster through the air, air resistance:
A. increases.
B. decreases.
C.remains the same.
D. Not enough information.
5- The force upon an object due to gravity.
A. Mass.
B. Weight.
c. Speed.
D. Acceleration.
6- The force of gravity acting on a 2-kg melon is:
a. 2 kg.
c. 20 N.
b. 10 N.
d. more than 20 N.
7- The force of friction can occur:
A. With sliding objects.
B. In water.
c.In air.
D. All of the above.
8- If a 50-N person is to fall at terminal speed, the air resistance needed is:
a. less than 50 N.
b. 50 N.
c. more than 50 N.
d. None of the above.
9- An object with a mass of 1 kilogram on Earth:
a. Has less mass on the Moon. b. Has the same mass on the Moon.
c. Has more mass on the Moon. d. Weighs the same everywhere.
10- Coin and feather fall in vacuum, which will reach first:
a. Coin.
B. Feather.
c. Will reach together.
D. Nothing.
MCQ 3:
1. The action-reaction forces we encounter in Newton's Third Law
a) always cancel each other out.
b) always act on different objects.
c) are always the same as friction and support forces.
d) may be perpendicular to each other.
2. Newton's Third Law applies
a) only to objects at rest (like pushing on a wall)
b) to object pairs of which at least one must be at rest (like striking a wall with a moving ball)
c) to any two objects that interact
d) only to pairs of objects for which one is much more massive than the other.
3. Newton's Third Law is
a) a special case of Newton's Second Law.
b) a special case of Newton's First Law.
c) independent of Newton's other Laws of Motion.
d) applicable only when air resistance can be neglected.
4. The resultant of two vectors is
a) the smaller of the two vectors.
b) the average of the two vectors.
c) the vector sum of the two vectors.
d) the larger of the two vectors.
5. Vectors may be added
a) like ordinary numbers.
b) by multiplying their magnitudes.
c) by subtracting their magnitudes and multiplying their units.
d) by constructing a vector addition diagram.
ANSWERS
Answers of fill in blank:
1- Kilogram (kg)
2- Newton (N)
3- Newton’s third law of motion
4- Law of conservation of momentum
5- Inertia
6- Also increases
7- The same as; more than
8- Weight
9- Newton’s second law of motion
10- Inertia
Answer of Equations:
1) 2 N * 1lb / 4.45 N = 0.45 lb.
2) 500 / 9.8 = 51.02 kg.
3) 21 x 7
=147 N
4) 900 / 10 = 90 kg.
𝑚
5) R = √(3)2 + (4)2 = 5 𝑠 .
6) 20 * 420 = 8400 kg m/s.
7) 5.2 * 1.74 = 9.084 Ns
8) 20 * 5 = 100 kg m/s (100 Ns).
9) (950 * 40) – (950 * 30) = 9500 kg m/s.
10) Momentum before = momentum after (5) * (1) + (1) v = 0
5+v=0
v = -5 m/s
so the little fish approaches the big fish at 5 m/s, the momentum after will be 0.
Answers of definitions:
1- (Mass )
2- ( Weight )
3- ( Newton’s Second Law of Motion ( the law of acceleration )
4- ( Newton’s Third Law of Motion )
5- ( Vector Quantity )
6- ( Momentum )
7- ( Impulse )
8- ( Bouncing )
9- ( Law of Conservation of Momentum )
10- ( Elastic Collision )
Answers of MCQ 1:
Two forces
the same
foot
equal
4000 N
12 kg•m/s
Quadrupled
Change
one-tenth as much
zero
Answers of MCQ 2:
Mass is most closely related to:
1- a. Inertia.
2- b. Increases.
3- A. Halved.
4- A. increases.
5- B. Weight.
6- c. 20 N.
7- D. All of the above.
8- b. 50 N.
9- b. Has the same mass on the Moon.
10- c. will reach together
Answers of MCQ 3:
12345-
Answer: b
Answer: c
Answer: c
Answer: c
Answer: d