# Forces and their Effects

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what is a force?

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### 20 Terms

1

what is a force?

A force is either a push or a pull that one object exerts on another object

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2

what is contact force?

Forces that result from direct physical contact between objects, such as friction, tension, air resistance and normal contact forces

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3

state two types of friction forces?

1-static friction

2-kinetic friction

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4

what is tension force?

Tension is the pulling force transmitted through a string, rope, cable, or any similar object when it is pulled tight by forces acting from opposite ends.

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5

what is normal force?

Normal force is the force exerted by a surface that supports an object in contact with it, perpendicular to the surface.

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6

what is air resistance?

Air resistance is a frictional force acting on an object moving through the air.

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7

what are non contact forces?

Forces that act at a distance, including gravitational, electrostatic,nuclear and magnetic forces.

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8

what is gravitational force?

The force of attraction between any two masses in the universe.

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9

what is electrostatic force?

The force between electrically charged objects

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10

what is magnetic force?

The force exerted between magnets or between a magnet and a magnetic material.

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11

what are nuclear forces?

Forces that act within the nucleus of an atom.

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12
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13

state newton’s first law

Every object will continue in its state of rest or uniform motion in a straight line unless a resultant force acts on it.

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14

state newton’s second law

When a resultant force acts on an object of a constant mass, the object will accelerate in the direction of the resultant force. The product of the mass and acceleration of the object gives the resultant force.

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15

state newton’s third law

Every action has an equal and opposite reaction.A force is either a push or a pull that one object exerts on another object. It can produce, slow down, speed up or stop motion or change its direction.

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16

what is centre of mass?

The center of mass of an object is the point at which the weight of the object acts

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17

what is moment?

turning effect of a force about a point

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18

state the principle of moments

For an object in equilibrium, sum of clockwise moments = sum of anticlockwise moments so the net (resultant) moment becomes 0.The sum of forces in one direction must equal the sum of forces in the opposite direction.

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19

what are leavers?

A lever is a simple machine consisting of a rigid bar (lever arm) that pivots around a fixed point called the fulcrum.

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20

what are gears?

Gears are toothed wheels that transmit rotational motion and torque from one part of a machine to another.

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