12 Questions
According to Newton’s III law, what is the “reaction” force to the gravitational force by the earth on a book at rest on a table?
Answer hidden
2
Answer hidden
If two 50N weights are attached to a spring scale and the system is in equilibrium, what is the reading on the scale?
Answer hidden
What happens to a body if no force acts on it?
Answer hidden
By applying a force of 1 N, one can hold a body whose mass is approximately equal to:
Answer hidden
What happens to the coefficient of friction when the normal reaction is halved?
Answer hidden
At sea level, atmospheric pressure is about
Answer hidden
Magnetic or gravitational force is an example of
Answer hidden
PA, PB, and PC are the values of pressure exerted by the liquid at A, B, and C of the container respectively. Which of the following is true for the container?
Answer hidden
The mass of an object is 60 kg on the earth. What would be its mass if it is taken to the surface of the moon?
Answer hidden
Spring balance is a device used to measure
Answer hidden
Which one of the following is not used to reduce friction?
Answer hidden
Study Notes
- A book at rest on a table experiences a normal force according to Newton's Third Law from the table in response to the gravitational force of the earth on the book. (a) The normal force exerted by the table on the book (b) is an equal and opposite reaction to the gravitational force.
- A heavy lorry has a high inertia, making it more difficult to start moving and stop moving than a lighter vehicle. (To start) Difficult, (To stop) Difficult.
- Two 50N weights on a spring scale, when in equilibrium, will result in a reading of 100N on the scale, as the forces on each side of the scale are equal and opposite.
- An object at rest, or moving in a straight line with constant speed, will remain at rest or move in that manner unless acted upon by a net force.
- One can hold a body having a mass approximately equal to one kilogram with a force of one newton.
- When the normal reaction is halved, the coefficient of friction remains unchanged on dry surfaces, but can vary on different surfaces.
- The maximum force of static friction is referred to as limiting friction.
- A non-contact force is a force that acts between two objects without physical contact.
- At sea level, atmospheric pressure is approximately 101,325 Pa.
- The mass of a 60kg object on earth is not affected by a change in location to the surface of the moon.
- A spring balance is a device used to measure mass.
- Neither oil, ball bearings, nor graphite are used to increase friction.
- The force applied to a nail with a cross-sectional area of 0.001 cm² exerts a pressure of 8N/cm².
- Teflon is a polymer made from tetrafluoroethylene.
- Nylon 6,6 is a synthesized polyamide.
- Silk is a natural fiber, not a polymer.
- Glyptal is not a polyamide, but a type of alkyd resin.
- Wool is an example of a natural polymer.
- Neoprene is a synthetic rubber that contains sulfur, chlorine, and carbon.
- Polyvinyl chloride (PVC) is produced by the polymerization of vinyl chloride (CH2=CH-Cl).
- Dacron is a type of polyester.
- Carbon monoxide (CO) is a neutral oxide.
- Aluminum (Al) is less reactive than copper (Cu), calcium (Ca), and tin (Sn).
- Sulfur (S) reacts with hydrogen to form hydrogen sulfide (H2S), which has a smell of rotten eggs.
- Sulfur (S) forms both neutral and acidic oxides (SO and SO2).
- Bromine (Br) is a non-metal that is a liquid at room temperature.
- An element reacts with oxygen to form an oxide.
Test your knowledge of Newton's third law of motion and inertia with this quiz. Answer questions about reaction forces, gravitational forces, normal forces, and the effects of inertia on starting and stopping heavy objects like a lorry.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
