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# Physics P4

### Explaining Motion

What does velocity tell you? Speed and direction of travel.
How it velocity measured? Changes in distance in one direction is described as positive and changes in the opposite direction are described as negative.
What do you need to calculate an objects speed? Distance and Time
How can you calculate speed? Speed=Distance/Time
What are the two different ways of measuring speed? Instantaneous and average speed
What is the instantaneous velocity? The instantaneous speed with an indication of direction.
What does it mean is happening if the line of a distance-time graph is curved? The speed of an object is moving.
What does the gradient of a distance-time graph represent? How quickly it is increasing in speed (accelerating)
What are speed-time graphs in lorry tachographs used for? To make sure they don't exceed the speed limit and rest for suitable amounts of time.
Can a velocity-time graph have negative values for the velocity axis? Yes
How do you measure acceleration? Acceleration=Change in speed/Time taken
The forces in an interaction pair are... Equal in size and opposite in direction and they act on different objects.
Name three examples of forces in action. Gravity (weight) Air resistance (drag) Rocket and jet engines
How do people walk? By applying a force on to the earth and having an equal and opposite force generated. The person moves because they have a much smaller mass than the Earth.
What is friction? The resistance force between two surfaces as they move against each other.
What does the size of an arrow represent in a forces diagram? The size of the force.
What does the direction of an arrow represent in a forces diagram? The direction the forced is acting in.
The overall effect of two or more forces is called the... Resultant force.
What is momentum? The measure of the motion of an object.
How can you calculate momentum? Momentum = Mass x Velocity
If the resultant force acting on an object is not zero it will... Cause a change of momentum.
Collision's can cause a change in an object's... Momentum
If the change in momentum is spread out over a longer period of time, the resultant force will be smaller/larger? Smaller
The force of the impact on the human body can be reduced by increasing the... Time of impact
What are the two forces that cars and bicycles have? Driving force and Counter force
What does the amount of kinetic energy that an object has rely on? Mass and velocity
Kinetic energy can be found by... Kinetic energy= 1/2 x Mass x Velocity
What are the two forces that oppose motion when an object falls? Air resistance and Gravity
When work is done on an object, the object losses/gains energy? Gains
When work is done by an object, the object losses/gains energy? Losses
The amount of work done is the same as... the amount of energy transferred.
How do you calculate the work done? Work done= Force x Distance
What does the gravitational potential energy depend on? Mass and height above ground
Created by: 08burkeh