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Physics Part-I
Class 11
NCERT
1
Chapter 1: Physical World
16 questions
2
Chapter 2: Units and Measurements
51 questions
3
Chapter 3: Motion in Straight Line
50 questions
4
Chapter 4: Motion in a Plane
43 questions
5
Chapter 5: Laws of motion
52 questions
Q1
Give the magnitude and direction of the net force acting on
(a) A drop of rain falling down with a constant speed.(b) A cork of mass floating on water.
(c) A kite skillfully held stationary in the sky.
(d) A car moving with a constant velocity of on a rough road.
(e) A high-speed electron in space far from all material objects, and free of electric and magnetic fields.
Q2
A pebble of mass is thrown vertically upwards. Give the direction and magnitude of the net force on the pebble,
(a) during its upward motion,
(b) during its downward motion,
(c) at the highest point where it is momentarily at rest. Do your answers change if the pebble was thrown at an angle of with the horizontal direction?
Ignore air resistance.
(a) during its upward motion,
(b) during its downward motion,
(c) at the highest point where it is momentarily at rest. Do your answers change if the pebble was thrown at an angle of with the horizontal direction?
Ignore air resistance.
Q3
Give the magnitude and direction of the net force acting on a stone of mass .(a) Just after it is dropped from the window of a stationary train.(b) Just after it is dropped from the window of a train running at a constant velocity of .(c) Just after it is dropped from the window of a train accelerating with .(d) Lying on the floor of a train which is accelerating with , the stone being at rest relative to the train. Neglect air resistance throughout
View all question6
Chapter 6: Work, Energy and Power
41 questions
7
Chapter 7: System of Particles and Rotational Motion
45 questions
8
Chapter 8: Gravitation
33 questions
Question
Easy
Solving time: 2 mins
A pebble of mass is thrown vertically upwards. Give the direction and magnitude of the net force on the pebble,
(a) during its upward motion,
(b) during its downward motion,
(c) at the highest point where it is momentarily at rest. Do your answers change if the pebble was thrown at an angle of with the horizontal direction?
Ignore air resistance.
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Text solution
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, in vertically downward direction, in all cases
Acceleration due to gravity, irrespective of the direction of motion of an object, always acts downward. The gravitational force is the only force that acts on the pebble in all three cases. Its magnitude is given by Newtons second law of motion as:
Where,
Net force
Mass of the pebble
The net force on the pebble in all three cases is and this force acts in the downward direction.
If the pebble is thrown at an angle of with the horizontal direction, it will have both the horizontal and vertical components of velocity. At the highest point, only the vertical component of velocity becomes zero. However, the pebble will have the horizontal component of velocity throughout its motion. This component of velocity produces no effect on the net force acting on the pebble.
Acceleration due to gravity, irrespective of the direction of motion of an object, always acts downward. The gravitational force is the only force that acts on the pebble in all three cases. Its magnitude is given by Newtons second law of motion as:
Where,
Net force
Mass of the pebble
The net force on the pebble in all three cases is and this force acts in the downward direction.
If the pebble is thrown at an angle of with the horizontal direction, it will have both the horizontal and vertical components of velocity. At the highest point, only the vertical component of velocity becomes zero. However, the pebble will have the horizontal component of velocity throughout its motion. This component of velocity produces no effect on the net force acting on the pebble.
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Practice more questions from Physics Part-I (NCERT)
Q1
Give the magnitude and direction of the net force acting on
(a) A drop of rain falling down with a constant speed.(b) A cork of mass floating on water.
(c) A kite skillfully held stationary in the sky.
(d) A car moving with a constant velocity of on a rough road.
(e) A high-speed electron in space far from all material objects, and free of electric and magnetic fields.
Q2
A pebble of mass is thrown vertically upwards. Give the direction and magnitude of the net force on the pebble,
(a) during its upward motion,
(b) during its downward motion,
(c) at the highest point where it is momentarily at rest. Do your answers change if the pebble was thrown at an angle of with the horizontal direction?
Ignore air resistance.
(a) during its upward motion,
(b) during its downward motion,
(c) at the highest point where it is momentarily at rest. Do your answers change if the pebble was thrown at an angle of with the horizontal direction?
Ignore air resistance.
Q3
Give the magnitude and direction of the net force acting on a stone of mass .(a) Just after it is dropped from the window of a stationary train.(b) Just after it is dropped from the window of a train running at a constant velocity of .(c) Just after it is dropped from the window of a train accelerating with .(d) Lying on the floor of a train which is accelerating with , the stone being at rest relative to the train. Neglect air resistance throughout
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(c) Upwards with a uniform acceleration of .
What would be the reading on the scale in each case?
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| Question Text | A pebble of mass is thrown vertically upwards. Give the direction and magnitude of the net force on the pebble, (a) during its upward motion, (b) during its downward motion, (c) at the highest point where it is momentarily at rest. Do your answers change if the pebble was thrown at an angle of with the horizontal direction? Ignore air resistance. |
| Updated On | Sep 27, 2022 |
| Topic | Laws of motion |
| Subject | Physics |
| Class | Class 11 |
| Answer Type | Text solution:1 Video solution: 2 |
| Upvotes | 268 |
| Avg. Video Duration | 7 min |
