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All questions of Forces Can Change Motion for Grade 3 Exam
If you roll a ball across the carpet, which forces will cause it to slow down and then stop?- a) The push from your hand and gravity
- b) Magnetic pull and upthrust
- c) Gravity, friction and air resistance
- d) Upthrust and air resistance
Correct answer is option 'C'. Can you explain this answer?
a)
The push from your hand and gravity
b)
Magnetic pull and upthrust
c)
Gravity, friction and air resistance
d)
Upthrust and air resistance
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Nclex Coaching Centre answered |
Gravity pulls the ball against the carpet. The ball rubs against the carpet, which is friction, and the air around the ball also rubs against it
What are forces measured in?- a) Newtons
- b) Kilometres
- c) Millilitres
- d) Degrees Celsius
Correct answer is option 'A'. Can you explain this answer?
a)
Newtons
b)
Kilometres
c)
Millilitres
d)
Degrees Celsius
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Nclex Coaching Centre answered |
The newton is named after the famous scientist Isaac Newton who you may have heard of
In which direction does gravity exert force (as experienced by people or objects on Earth)?- a) Up
- b) Down
- c) Both up and down
- d) Gravity can exert force in any direction
Correct answer is option 'B'. Can you explain this answer?
a)
Up
b)
Down
c)
Both up and down
d)
Gravity can exert force in any direction
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Nclex Coaching Centre answered |
Gravity pulls all objects (on the Earth's surface or in its atmosphere) down towards the centre of the Earth - the Earth's gravity even keeps the Moon in orbit because it pulls the Moon towards its centre (otherwise the Moon would travel in a straight line out into space)
What is the SI unit of force?- a)Joule
- b)Pascal
- c)Newton
- d)Watt
Correct answer is option 'C'. Can you explain this answer?
What is the SI unit of force?
a)
Joule
b)
Pascal
c)
Newton
d)
Watt
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Nclex Coaching Centre answered |
The SI unit of force is the Newton (N), named after Sir Isaac Newton, and is defined as the force required to accelerate a mass of one kilogram at a rate of one meter per second squared.
What happens to an object when the forces acting on it are balanced?- a)It moves with increasing speed
- b)It accelerates in the direction of the larger force
- c)It moves at a constant speed in the direction of the larger force
- d)It remains stationary or continues to move at a constant speed in the same direction
Correct answer is option 'D'. Can you explain this answer?
What happens to an object when the forces acting on it are balanced?
a)
It moves with increasing speed
b)
It accelerates in the direction of the larger force
c)
It moves at a constant speed in the direction of the larger force
d)
It remains stationary or continues to move at a constant speed in the same direction
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Nclex Coaching Centre answered |
When forces are balanced, there is no net force acting on the object, so it either remains stationary or continues to move at a constant speed in the same direction.
Which of the following would you use when measuring force?- a) A ruler
- b) A hygrometer
- c) A forcemeter
- d) A thermometer
Correct answer is option 'C'. Can you explain this answer?
a)
A ruler
b)
A hygrometer
c)
A forcemeter
d)
A thermometer
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Nclex Coaching Centre answered |
Another name for a forcemeter is a Newtonmeter
Which unit should be used to measure mass (the amount of matter an object contains)?- a) Grams
- b) Newtons
- c) Centimetres
- d) Degrees Celsius
Correct answer is option 'A'. Can you explain this answer?
a)
Grams
b)
Newtons
c)
Centimetres
d)
Degrees Celsius
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Nclex Coaching Centre answered |
Although weight is often given in kilograms and grams, this measurement really refers to mass. Weight is dependent on gravity and can change if the force of gravity is different (you wouldn't weigh the same on the Moon as you do on Earth, because the Moon has less gravity)
Which of the following is an example of a contact force?- a)Magnetic force between two magnets
- b)Gravitational force between Earth and the Moon
- c)Electrostatic force between charged particles
- d)Frictional force between a car's tires and the road
Correct answer is option 'D'. Can you explain this answer?
Which of the following is an example of a contact force?
a)
Magnetic force between two magnets
b)
Gravitational force between Earth and the Moon
c)
Electrostatic force between charged particles
d)
Frictional force between a car's tires and the road
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Nclex Coaching Centre answered |
Contact forces are forces that occur when two objects are in direct contact with each other, such as friction between surfaces.
Forces can cause objects to change what?- a) Their speed
- b) Their direction
- c) Their shape
- d) All of the above
Correct answer is option 'D'. Can you explain this answer?
a)
Their speed
b)
Their direction
c)
Their shape
d)
All of the above
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Nclex Coaching Centre answered |
Forces can speed things up and slow them down, push or pull them in a new direction, or squash and stretch them!
What is a force?- a) A source of energy
- b) A push or a pull
- c) A magnet
- d) A measurement
Correct answer is option 'B'. Can you explain this answer?
a)
A source of energy
b)
A push or a pull
c)
A magnet
d)
A measurement
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Nclex Coaching Centre answered |
A force is always exerted either as a push or a pull
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