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Physics P4
Explaining Motion
| Question | Answer |
|---|---|
| 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
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