# Forces and motion/ movement

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- Created by: Jasminea
- Created on: 06-02-14 16:50

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- Forces and motion/ movement
- Mass and weight
- MASS NEVER CHANGES

- Newton's laws of motion
- 1st law
- If the total force on an object is 0, or all the forces balance out to give zero then the object is still or moving at constant velocity
- Example: Spacecraft only needs fuel to escape the atmosphere... zero force 4 day trip to the moon at constant velocity
- Hockey, curling, parachitist

- Example: Spacecraft only needs fuel to escape the atmosphere... zero force 4 day trip to the moon at constant velocity

- If the total force on an object is 0, or all the forces balance out to give zero then the object is still or moving at constant velocity
- 2nd law
- The total force acting on an object is directly proportional to it's acceleration in m/s/s. This is shown by the straight line graph on the air track experiment. The constant of proportion is the mass of the car.
- F = M x A This is for sideways motion
- F is the total force, you must find this by adding or subtracting forces before using the equation
- W = M x G. this is for falling objects (G is acceleration)

- F = M x A This is for sideways motion

- The total force acting on an object is directly proportional to it's acceleration in m/s/s. This is shown by the straight line graph on the air track experiment. The constant of proportion is the mass of the car.

- 1st law
- Moon
- On the moon a hammer and feather will hit the ground at the same time because there's no air, air resistance
- Velocity is always changing (direction)

- Car
- thinking distance
- affected by
- speed
- tiredness
- poor night vision
- Phones/eating
- drugs/alcohol

- affected by
- Braking distance
- affected by
- mass of vehicle
- Weather conditions
- Conditions of brakes
- Speed

- affected by
- Total stopping distance = Thinking distance + breaking distance

- thinking distance
- Parachutist
- As the skydiver first jumps out there's only weight on her and it's her strongest acceleration
- After a while she speeds up, this causes air resistance
- When air resistance = the weight force = 0 so acceleration = 0. velocity is constant, terminal velocity
- The parachute opens and this causes large area and large air resistance. This causes decelleration
- Her speed drops to a new slower terminal velocity
- She slowly drops to the ground

- Her speed drops to a new slower terminal velocity

- The parachute opens and this causes large area and large air resistance. This causes decelleration
- Total force = W-A
- If the total force on an object is 0, or all the forces balance out to give zero then the object is still or moving at constant velocity
- Example: Spacecraft only needs fuel to escape the atmosphere... zero force 4 day trip to the moon at constant velocity
- Hockey, curling, parachitist

- Example: Spacecraft only needs fuel to escape the atmosphere... zero force 4 day trip to the moon at constant velocity

- If the total force on an object is 0, or all the forces balance out to give zero then the object is still or moving at constant velocity

- When air resistance = the weight force = 0 so acceleration = 0. velocity is constant, terminal velocity
- A = W/M

- After a while she speeds up, this causes air resistance

- As the skydiver first jumps out there's only weight on her and it's her strongest acceleration
- Speed
- Object moving at a constant speed you can use Distance = speed x time

- Velocity
- speed in a particular direction
- movement of a straight line
- Object moving at a constant speed you can use Distance = speed x time

- movement of a straight line

- speed in a particular direction
- Graphs
- reversing, slowing, going back
- Slowing down
- Still/ stationary
- Speeding up or accelerating
- velocity time
- gradient of the graph = acceleration
- D = V x T
- D = area under the v-t graph

- Acceleration due to gravity
- If there's no air resistance. all objects fall at the same rate of acceleration,g. G = 10m/s/s
- To convert mass and weight. M x 10 = W

- If there's no air resistance. all objects fall at the same rate of acceleration,g. G = 10m/s/s

- Mass and weight

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