Term
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Definition
| a push, pull or twist on an object resulting from the object's interaction with another object |
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Term
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Definition
| as a result of an interaction |
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Term
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Definition
-change in shape
-start moving/stop moving
-accelerate/decelerate |
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Term
| difference between contact and non-contact force |
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Definition
contact: forces that are exerted through the direct contact of two or of two or more surfaces. EG pushing a trolley
non-contact: do not require any physical connection. EG gravity pulling down an object |
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Term
| unit used to measure force |
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Definition
| newton (N) -> the composite of mass and acceleration |
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Term
| equipment used to measure force |
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Definition
-a force meter, otherwise known as a newton spring balance
-a dynometer |
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Term
| How to represent forces in a diagram |
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Definition
-Gravity: F(G) the magnitude is usually 9.8m/s2
-Normal: F(N) the magnitude when balanced is equal to gravity
-Tension: F(T) the magnitude is any (up to breaking load)
-Friction: F(Fr) the direction is opposed to relative motion |
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Term
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Definition
a quantity that has both magnitude and direction. for example if you throw a ball TWICE AS HARD and to the LEFT.
A force is a vector quantity because to fully describe it you must describe both the magnitude and direction. |
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Term
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Definition
| a state in which all influences acting on an object cancel each other out so that a balanced equation results. |
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Term
| what happens to an object when forces are not in equilibrium? |
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Definition
| an objects motion will change in the direction of the superior force |
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Term
| Newton's First Law of Motion |
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Definition
| An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Often referred to as the law of inertia. |
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Term
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Definition
| The tendancy of an object to resist any changes to its motion |
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Term
| Example of Newton's First Law of Motion |
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Definition
| A stationary object will resist changes to its motion by remaining stationary. |
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Term
| Newton's Second Law of Motion |
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Definition
| The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object). |
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Term
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Definition
The force acting on an object is equal to the mass of the object times its acceleration.
The force is measured in Newtons, the acceleration is measured in m/s/s and the mass is measured in kilograms. |
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Term
| Newton's Third Law of Motion |
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Definition
| For every action, there is an equal and opposite reaction. |
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Term
| Examples of Newton's Third Law of Motion |
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Definition
| When you sit on a chair your body acts on the chair with one force and the chair reacts with another force on you. |
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Term
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Definition
The weight of an object is the force of gravity on the object and may be defined as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the newton.
The mass of an object is the quantity of matter in an object. |
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Term
| Define work and give examples |
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Definition
| Work is done when a force acts on an object over a distance. It is also done when energy is transformed. |
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Term
| How do you find the work done? |
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Definition
| Work=force x distance (or displacement) |
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Term
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Definition
| The rate at which work is done. |
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Term
| How do you find the power? |
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Definition
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Term
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Definition
| The energy an object possesses due to its motion. |
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Term
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Definition
| The energy an object has due to its position in a force field or that a system has due to its configuration. |
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Term
| Formula for kinetic energy |
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Definition
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Term
| Formula for potential energy |
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Definition
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Term
| Types of potential energy |
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Definition
| Gravitational potential energy, chemical potential energy or elastic potential energy |
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Term
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Definition
| The sum of all the forces acting on an object |
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Term
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Definition
| A substance that has inertia and occupies physical space |
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