Paper 1 Collection
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SP1a - What is a scalar quantity?
A quantity with a magnitude (size) but no direction
SP1a - What is a vecotr quantity?
A quantity with a magnitude (size) and direction.
SP1a - What are the six main vector quantities?
• Velocity • Displacement • Acceleration • Force • Weight • Momentum
SP1b - How do you work out average speed?
Speed (m/s) = Distance(m) / Time(s)
SP1b - What is the average speed of walking and cycling?
• Walking: 1.4m/s • Cycling: 6m/s
SP1b - What are the two things you can use to measure speed in an experiment?
• Stopwatch • Light gates
SP1b - On a distance/time graph, what does the gradient represent?
The velocity
SP1b - On a distance/time graph, what does a horizontal line represent?
The object is stationary
SP1b - On a distance/time graph, what does a curve represent?
The object is accelerating/deccelerating
SP1c - How do you calculate acceleration?
Acceleration (m/s²) = Change in velocity (m/s) ÷ Time (s)
SP1c - What is the value of acceleration due to gravity?
9.8m/s² (rounded to 10m/s²)
SP1d - What does a straight slope mean on a velocity time graph?
Acceleration
SP1d - What does a horizontal line mean on a velocity time graph?
The object is moving at a constant velocity
SP1d - What does a curve mean on a velocity time graph?
Changing acceleration
SP1d - What does the area under a velocity time graph represent?
The distance covered
SP2a - If a rocket experiences 800kN of thrust upwards and its weight is 300kN, what is the resultant force?
800 is up 300 is down. 800 - 300 = 500 500kN upwards
SP2b - What is Newton’s first law?
• A moving object will remain at a constant velocity until an external force acts on it. • A stationary object will remain stationary until n external force acts on it.
SP2b - What is centripetal force?
• An object moving in a circle at a constant speed is contantly changing velocity and so is constantly accelerating towards the centre of the circle. • As the car is accelerating, there must be a force acting on it. • This is centriputal force and always acts towards the centre of the circular motion.
SP2b - What three things can provide centriputal force?
• Tension • Friction • Gravity
SP2b - How can the amount of centripetal force needed for an object to remain in circular motion be altered?
The amount of force needed increases if you: • Increase the mass of the object • Increase the speed of the object • Decrease the radius of the circle
SP2c - What is the difference between weight and mass?
Mass is the quantity of matter in an object and weight is the pull force the object experience depending on the gravitational field strength. Weight - N Mass - Kg
SP2c - What formula links weight and mass?
w = m x g (Weight = mass x gravitational field strength)
SP2c - Describe the forces acting on a skydiver as they jump out of a plane?
• As soon as they jump out, the only force acting on them is their weight and so they accelerate downwards • Air resistance increases with speed and so as they accelerate, it increases until eventually it is equal to their weight • At this point the resultant force acting on the skydiver is 0 and so they stop changing velocity as they have reached terminal velocity • Once the parachute is launched, the air resistance greatly increases causing a decceleration • As the velocity decreases so does the air resistance until it is again equal to the weight • It now reaches a new lower terminal velocity
SP2d - What is Newton’s second law of motion?
The acceleration of an object depends on: • Its mass • The Force acting on it