Standardized Test Practice 1.What is the acceleration of the car described by the graph on the right? Question 1 Chapter 4 A. 0.20 m/s 2 B. 0.40 m/s 2

Standardized Test Practice

1. What is the acceleration of the car described by the graph on the right?

Question 1

Chapter

4

A. 0.20 m/s2

B. 0.40 m/s2

C. 1.0 m/s2

D. 2.5 m/s2


2. What distance will the car described by the above graph have traveled after 4.0 s?

Question 2

Chapter

4

A. 13 m

B. 40 m

C. 80 m

D. 90 m

3. If the car in the graph on the right maintains a constant acceleration, what will its velocity be after 10 s?

Question 3

Chapter

4 Standardized Test Practice

A. 10 km/h

B. 25 km/h

C. 90 km/h

D. 120 km/h


4. In a tug-of-war, 13 children, with an average mass of 30 kg each, pull westward on a rope with an average force of 150 N per child. Five parents, with an average mass of 60 kg each, pull eastward on the other end of the rope with an average force of 475 N per adult. Assuming that the whole mass accelerates together as a single entity, what is the acceleration of the system?

Question 4

Chapter

4

A. 0.62 m/s2 E

B. 2.8 m/s2 W

C. 3.4 m/s2 E

D. 6.3 m/s2 W


5. What is the weight of a 225-kg space probe on the Moon? The acceleration of gravity on the Moon is 1.62 m/s2.

Question 5

Chapter

4

A. 139 N

B. 364 N

C. 1.35×103 N

D. 2.21×103 N


6. A 45-kg child sits on a 3.2-kg tire swing. What is the tension in the rope that hangs from a tree branch?

Question 6

Chapter

4

A. 310 N

B. 4.4×102 N

C. 4.5×102 N

D. 4.7×102 N


7. The tree branch mentioned in Question 6 sags and the child’s feet rest on the ground. If the tension in the rope is reduced to 220 N, what is the value of the normal force being exerted on the child’s feet?

Question 7

Chapter

4

A. 2.2×102 N

B. 2.5×102 N

C. 4.3×102 N

D. 6.9×102 N

8. According the graph on the right, what is the force being exerted on the 16-kg cart?

Question 8

Chapter

4 Standardized Test Practice

A. 4 N

B. 8 N

C. 16 N

D. 32 N

Chapter Assessment Questions

If a golf ball, a cricket ball and a bowling ball are thrown with a same force, which ball will move with a greater acceleration?

Question 1

Chapter

4

A. Golf ball

B. Cricket ball

C. Bowling ball

D. The three balls will have equal acceleration.

Reason: As , the lesser the mass the greater is the

acceleration. Since golf ball has least mass, it will move

with greater acceleration.

m

1 ,m aaF


Answer: B

Answer 1

Chapter

4


Jack is boating in a river applying a contact force of 30 N, in a direction opposite to the flow of water, at the same time the water is exerting a force of 30 N on the boat. In which direction will the boat move?

Question 2

Chapter

4

A. The boat will move in the direction of the flow of water.

B. The boat will not move at all.

C. The boat will move back and forth within a particular distance.

D. The boat will move in the direction opposite to the flow of water.


Answer: B

Answer 2

Chapter

4

Reason: Since two equal and opposite forces are acting together, the net force is zero. Hence, the boat will not move at all.


What is inertia?

Question 3

Chapter

4

A. Force.

B. Tendency of a body to stay only at rest.

C. Tendency of a body to move with constant acceleration.

D. Tendency of a body to move with constant velocity.

Reason: Inertial of a body is the tendency of a body to stay at rest and/or to move with constant velocity, remember being at rest is simply a special case of state of constant velocity, v = 0 m/s.


Answer: D

Answer 3

Chapter

4


If the weight of a person on Earth is 120 N, what will his weight be on the Moon? (Gravity on Moon is six times less than the gravity on Earth.)

6

N120

Question 4

Chapter

4

A.

B.

C.

D.

2m/s 6

N120g

N120

2m/s

N120

g


Answer: A

Answer 4

Chapter

4

6g

120 N

6

Weight of person on Moon = Gravity on Moon × mass of person

So, weight of the person on Moon =

Reason: Gravity on Moon is

2m/s N 120

g

6m/s N 120

2

gg

Mass of the person is (since mass = weight/g)


What happens when the drag force is equal to the force of gravity?

Question 5

Chapter

4

A. Object comes to rest.

B. Object moves with constant acceleration.

C. Object moves with constant velocity.

D. Velocity of the object increases.


Answer: C

Answer 5

Chapter

4

Reason: When drag force equals the force due to gravity, the net force acting on the object is zero. As a result of which, the object moves with constant velocity, which is called terminal velocity.


If a table-tennis ball, a football and a baseball are dropped in air which ball will have the greater terminal velocity?

Question 6

Chapter

4

A. Table-tennis ball

B. Football

C. Baseball

D. All the balls will reach the terminal velocity at the same time.


Answer: C

Answer 6

Chapter

4

Reason: When light objects with large surface areas are falling, the drag force has a substantial effect on their motion, and they quickly reach terminal velocity. Heavier more compact objects are not affected as much by the drag force.

Baseball being heavier and more compact will have the greater terminal velocity in air.

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Standardized Test Practice 1.What is the acceleration of the car described by the graph on the right? Question 1 Chapter 4 A. 0.20 m/s 2 B. 0.40 m/s 2