physics : class11 Equal and Opposite Gravitational Forces : Gravitational Force : Gravitation MCQ Questions and Answers
Practice important
Equal and Opposite Gravitational Forces
MCQ questions and answers.
Page 1
of
1
|
10
MCQ Questions
1. Two bodies attract each other gravitationally. According to Newton's third law, the gravitational force exerted by the first body on the second is
A.
Greater than the force exerted by the second on the first
B.
Smaller than the force exerted by the second on the first
C.
Equal in magnitude and opposite in direction to the force exerted by the second on the first
D.
Zero when the bodies have different masses
Correct Answer:
Equal in magnitude and opposite in direction to the force exerted by the second on the first
Explanation:
Gravitational forces between two bodies form an action-reaction pair. They are equal in magnitude and opposite in direction.
2. The Earth pulls an apple downward with a gravitational force. The force exerted by the apple on the Earth is
A.
Equal in magnitude and upward in direction
B.
Greater in magnitude and upward in direction
C.
Equal in magnitude and downward in direction
D.
Zero because the apple is much smaller
Correct Answer:
Equal in magnitude and upward in direction
Explanation:
The apple and Earth exert equal and opposite gravitational forces on each other. The apple pulls Earth upward while Earth pulls the apple downward.
3. Two objects of masses 2 kg and 5 kg attract each other. If the 2 kg object exerts a force of 10 N on the 5 kg object, the force exerted by the 5 kg object on the 2 kg object is
A.
2 N in the same direction
B.
5 N in the opposite direction
C.
10 N in the opposite direction
D.
25 N in the same direction
Correct Answer:
10 N in the opposite direction
Explanation:
By Newton's third law, the two gravitational forces are equal in magnitude and opposite in direction. Therefore, the force is 10 N in the opposite direction.
4. When two bodies are separated by a distance and attract each other gravitationally, the two forces act
A.
On the same body in the same direction
B.
On different bodies in opposite directions
C.
On different bodies in the same direction
D.
Only on the more massive body
Correct Answer:
On different bodies in opposite directions
Explanation:
Each body experiences a gravitational force due to the other. These forces act on different bodies and point toward each other, so their directions are opposite.
5. A planet and its moon exert gravitational forces on each other. Which statement is correct?
A.
The planet exerts a force, but the moon does not
B.
The moon exerts a greater force because it moves faster
C.
Both exert equal gravitational forces in opposite directions
D.
Both exert forces in the same direction
Correct Answer:
Both exert equal gravitational forces in opposite directions
Explanation:
The gravitational interaction is mutual. The planet and moon exert forces that are equal in magnitude and opposite in direction.
6. Why do a large Earth and a small stone experience equal gravitational forces on each other?
A.
Because gravitational forces always occur as equal and opposite pairs
B.
Because both bodies have the same mass
C.
Because the stone has greater acceleration
D.
Because Earth does not attract the stone
Correct Answer:
Because gravitational forces always occur as equal and opposite pairs
Explanation:
The equality of the forces follows from Newton's third law, not from the bodies having equal masses.
7. If body A attracts body B with a gravitational force of 6 N, body B attracts body A with a force of
A.
0 N
B.
3 N in the same direction
C.
6 N in the opposite direction
D.
12 N in the opposite direction
Correct Answer:
6 N in the opposite direction
Explanation:
The gravitational forces between two interacting bodies are equal in magnitude. Their directions are opposite, so the second force is 6 N in the opposite direction.
8. The gravitational force exerted by the Sun on Earth and the gravitational force exerted by Earth on the Sun are
A.
Equal and opposite
B.
Equal and in the same direction
C.
Different and opposite
D.
Zero because the Sun and Earth are far apart
Correct Answer:
Equal and opposite
Explanation:
The Sun and Earth exert mutual gravitational forces. Newton's third law requires these forces to be equal in magnitude and opposite in direction.
9. Two objects attract each other with a force of 20 N. What is the net force of these two interaction forces considered together as a vector sum?
A.
0 N
B.
10 N
C.
20 N
D.
40 N
Correct Answer:
0 N
Explanation:
The two gravitational forces are equal in magnitude and opposite in direction. Their vector sum is therefore zero, although each force acts on a different body.
10. A book rests on a table and is attracted gravitationally by Earth. The gravitational force exerted by the book on Earth is
A.
Equal in magnitude and opposite in direction to Earth's force on the book
B.
Smaller because the book has less mass
C.
Greater because Earth is moving
D.
Zero because the book is at rest
Correct Answer:
Equal in magnitude and opposite in direction to Earth's force on the book
Explanation:
Even when the book is at rest, it and Earth exert equal and opposite gravitational forces on each other.
Short Questions and Answers
Practice short questions and answers related to
Equal and Opposite Gravitational Forces
.
Short questions are currently unavailable for this page.