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Forces + Speed (Find the forces (If the force from the engines is the same…
Forces + Speed
Find the forces
If the force from the engines is the same as the forces of friction and air resistance the speed of the car will increase.
If the driver puts the brakes on, the force of friction will increase, and the car will slow down.
The swimmer will carry on swimming at the same speed if the forward force is balanced by water resistance.
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The bowler is still holding the ball. There is a force from this hand so the speed of the ball will stay the same while it is still in his hand. When the ball has left his hand its speed will decrease because air resistance will slow it down.
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Relative speed - If you have travelled in a car on the motorway, you may have noticed that other cars passing by appear to move slowly past you, even though you know the actual speeds of the two cars are very high. This is because of their relative motion to each other.
Another example of relative motion is where two objects are travelling in opposite directions either towards or away from each other.
When you are considering two objects that are both moving, their speed relative to each other is different from the speed of each object individually.
Objects moving in the same direction = fastest speed - slowest speed.
Objects moving in opposite directions = speed 1 + speed 2
Speed, distance and time
Distance Time graphs - A line sloping up on a distance - time graph shows that an object is travelling at a constant speed.
The steeper the line, the faster the object is moving.
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Velocity means a speed and a direction, so if you were asked to calculate the velocity from the graph you would need to include the minus sign because that shows that the car is moving in the opposite direction.