Physics Flashcards - Chapter 7

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A car is travelling at constant velocity. State the resultant force on the car. (1 mark)
The resultant force is zero.
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State Newtons first law.
An object will remain at rest or continue to move at constant velocity unless acted upon by a resultant force.
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State Newtons third law.
When two objects interact, they exert equal and opposite forces on each other.
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All interactions can be explained in terms of 4 fundamental forces, what are they?
Gravitational, electromagnetic, Strong nuclear and Weak nuclear.
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A person of weight 600N is standing still on the ground. State and explain the force exerted by the person on the earth.
Force on the earth = 600N, the person and the earth interact with each other. Any explaination of Newtons third law to explain.
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What is the equation for momentum?
momentum = Mass x Velocity
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State the principle of conservation of momentum?
For a system of interacting objects, the total momentum in a specific direction remains constant, as long as no external forces act on the system.
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State Newton's second law?
The net force acting on an object is directly proportional to the rate of change of its momentum.
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What is the equation for Newtons second law?
F = (Change in) p / (Change in) t
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State and explain the 'Special case' of F = ma.
F = (Change in) p / (Change in) t , (mv-mu) / t , m (v-u / t), F = ma
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When is the only time you can use the special case of 'F = ma'?
When the mass remains constant during the period of acceleration.
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What is 'Force x (Change in) time' ? Therefore, what is the impulse of a force? What is the unit of Impulse?
(Change in) momentum, Impulse of a force = Change in momentum, unit = Ns or kgms-1
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Other cards in this set

Card 2

Front

State Newtons first law.

Back

An object will remain at rest or continue to move at constant velocity unless acted upon by a resultant force.

Card 3

Front

State Newtons third law.

Back

Preview of the front of card 3

Card 4

Front

All interactions can be explained in terms of 4 fundamental forces, what are they?

Back

Preview of the front of card 4

Card 5

Front

A person of weight 600N is standing still on the ground. State and explain the force exerted by the person on the earth.

Back

Preview of the front of card 5
View more cards

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