Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Physics (P1)
Motion and Forces
| Question | Answer |
|---|---|
| What is a scalar quantity? | A quantity that only has a magnitude (size) |
| What is a vector quantity? | A quantity that has both a magnitude and a direction |
| Give 6 examples of Vector Quantities. | Velocity, Displacement, Force, Acceleration, Weight, Momentum |
| Give 4 examples of Scalar Quantities. | Speed, Distance, Mass and Energy |
| What is velocity? | Speed in a stated direction |
| What is the equation for average speed? | Speed=Distance/Time |
| What does the gradient represent on a distance/time graph? | The Speed |
| What does the gradient represent on a displacement/time graph? | The Velocity |
| How do you calculate speed of a given time for an accelerating distance/time graph? (2) | Draw a tangent at required time, Calculate gradient |
| Equation for acceleration? | Change in velocity / Time taken |
| Equation for change in velocities squared? | V²-U²=2as |
| What does the s represent? | Distance (m) |
| On a velocity/time graph what does the gradient represent? | Acceleration |
| How do I determine a constant speed in a real life scenario? (2) | Measure distance travelled and use a stopwatch for time taken |
| How would I use a light gate to measure speed? (3) | Place 2 light gates at start and end, measure distance between them, time taken will be automatically measured |
| Why is this better than a stopwatch? (2) | No human error, no reaction time |
| Typical wind speed. | 7m/s |
| Typical sound speed. | 330m/s |
| Typical walking speed. | 1.5m/s |
| Typical running speed. | 3m/s |
| Typical cycling speed. | 6m/s |
| Typical bus speed. | 6m/s |
| Typical train speed. | 50m/s |
| Typical plane speed. | 250m/s |
| Acceleration speed for gravity? | 9.81m/s |
| State Newtons first law regarding an object at resultant force of 0 | If the resultant force on an object is 0 the object will remain at rest or continue moving at a constant velocity |
| State Newtons first law regarding an object at resultant force of NOT 0 | The speed/and or direction changes |
| Give the equation for Newton's second law. | F=m x a |
| What is this in words? | Force=Mass x Acceleration |
| Describe what weight is. | The force that acts on the object due to gravity and the object's mass |
| What is the equation for weight? | W=m x g |
| What 2 objects can be used to measure weight? | Newton meter or calibrated spring balance |
| How does gravitational field strength affect the weight of a body? | The higher it is the more the weight will be |
| What do I need to know for the practical about relating force, mass and acceleration by varying the masses added trolleys? (3) | Acceleration equation, Newton's second law, use of light gates |
| When can an object travelling at a constant speed NOT have a constant velocity? | If the object is changing direction (ie moving in a circle) |
| Name of the resultant force for motion in a circle and what direction? | Centripetal force, acts towards the centre |
| What is inertial mass? (2) | Measure of how difficult it is to change a given object's velocity, ratio of force over acceleration |
| What is Newton's third law? | Whenever 2 objects interact, the forces they exert are equal and opposite |
| How can we relate momentum to Newton's third law? | Total momentum before collision = Total momentum after collision |
| What is momentum? | How hard it is to stop an object in motion |
| What is the equation for momentum? | P=m x v |
| Write an equation linking change in momentum with Newton's second law. | F=(mv-mu)/t |
| How do we measure human reaction time? | Ruler drop test: Person A holds ruler just above Person B's hand, drops it without telling them and they catch it |
| What is the average human reaction time? | 0.25 seconds. |
| What is the stopping distance of a vehicle equivalent to? | The sum of thinking and braking distance |
| What can affect braking distance? (5) | Mass, speed, state of road, amount of friction between tyres and road, state of vehicles brakes |
| What can affect thinking distance? | Driver's reaction time |
| Give 3 factors affecting driver's reaction time. | Tiredness, drugs and alcohol |
| What are the dangers caused by large decelerations? | Due to the force equation, a large deceleration means a large force is exerted on the car and passengers |
| What is the average mass on a car? | 1500kg |
Created by:
user-1956972