Test
P3 Quiz
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Preguntas del test (12)
1If an object is speeding up (or slowing down) then you might need to find the average of its speed over the journey. The equation for this is:
- AAverage speed = (u + v) / 2
- BAverage speed = (u + v) x 2
- CAverage speed = (u - v) / 2
2What is the symbol equation for distance = average speed x time?
- A(u + v) / 2 x t
- Bv / 2 x t
- C(u - v) / 2 x t
3Distance-time graphs:
- AGradient = speed
- BCurves represent acceleration or deceleration. A steepening curve means it's speeding up (increasing gradient). A levelling off curve means it's slowing down (decreasing gradient)
- CFlat sections are where it's stopped
- D"Downhill" sections (negative gradient) mean it's changed direction and is coming back toward its starting point
- EGradient = acceleration
- FFlat sections represent steady speed
4To calculate the speed from a distance-time graph you just have to calculate the gradient i.e. speed = gradient = vertical / horizontal (y / x).
- AVerdadero
- BFalso
5Acceleration:
- AHow quickly the speed is changing and measured in m/s^2
- BYou also accelerate when you change direction, with or without changing speed (velocity has speed and direction)
- CA decrease in speed is a deceleration - a negative acceleration
- DAcceleration = change in speed / time taken
- EAcceleration = change in speed x time taken
- FYou also accelerate when you change direction if you change speed too (velocity has speed and direction)
6Speed-time graphs:
- AGradient = acceleration. Uphill sections (positive gradient) are acceleration and downhill sections (negative gradient) are deceleration
- BFlat sections represent steady speed
- CThe area under any section of the graph is the distance travelled in that time interval
- DA curve means non-uniform (changing) acceleration or deceleration
- EFlat sections are where it's stopped
- FThe area under any section of the graph is the speed in that time interval
7To calculate the acceleration on a speed-time graph you just work out the gradient i.e. acceleration = gradient = vertical / horizontal (y / x).
- AVerdadero
- BFalso
8The speed on a speed-time graph can be found by reading the value off the speed axis.
- AVerdadero
- BFalso
9Speed is just a number, but velocity has direction too:
- AThe speed of an object is just how fast it's going - the direction isn't important
- BVelocity describes both the speed and direction of an object. E.g. velocity = 30 mph due north
- CYou can have negative velocities. If a car travelling at 20 m/s then turns around and goes in the opposite direction, the speed is still 20 m/s but the velocity becomes -20 m/s
- DIf two objects are moving parallel to each other, their relative velocity is the difference in their velocities. E.g. two cars with speeds of 30 m/s going in the same direction would have a relative velocity of 30 - 30 = 0 m/s but going in opposite directions it would be 30 - -30 = 60 m/s
- EThe speed of an object is just how fast it's going - the direction is important
- FIf two objects are moving parallel to each other, their relative velocity is the sum of their velocities. E.g. two cars with speeds of 30 m/s going in the same direction would have a relative velocity of 30 - 30 = 0 m/s but going in opposite directions it would be 30 - -30 = 60 m/s
10The weight of something depends on its mass and how much gravity there is pulling it down. What is the formula for weight?
- Aweight = mass x gravitational field strength
- Bweight = mass / gravitational field strength
- Cweight = mass + gravitational field strength
11Gravity is the force of attraction between all masses. You only notice it when one of the masses is really really big, like a planet:
- AOn the surface of a planet, gravity makes all things accelerate towards the ground, all with the same acceleration, g. So g is the acceleration due to gravity and it's also known as the gravitational field strength
- BThe value of g is about 10 m/s^2 (or 10 N/kg) on Earth. It's different on other planets though, and can even vary slightly in different places on Earth (e.g. between a mineshaft and a mountain). It's not affected by atmosphere though
- CGravity gives an object its weight - which is different from its mass.
- DOn the surface of a planet, gravity makes all things accelerate towards the ground, all with different accelerations, g. So g is the acceleration due to gravity and it's also known as the gravitational field strength
- EGravity gives an object its weight - which is the same as its mass.
- FThe value of g is about 10 m/s^2 (or 10 N/kg) on Earth. It's different on other planets though, and can even vary slightly in different places on Earth (e.g. between a mineshaft and a mountain). It's affected by atmosphere as well
12Mass and weight:
- AMass is just the amount of "stuff" in an object. For any given object this will have the same value anywhere in the Universe. It is not a force so it is measured in kilograms (kg)
- BWeight is caused by the pull of gravity. It is a force so it is measured in newtons (N)
- CAn object has the same mass whether it's on Earth or on the Moon - but it's weight will be different. A 1 kg mass will weigh less on the Moon (about 1.6 N) than it does on Earth (about 10 N), simply because the force of gravity pulling on it is less
- DMass is just the amount of "stuff" in an object. For any given object this will have the same value anywhere in the Universe. It is a force so it is measured in kilograms (kg)
- EAn object has the same weight whether it's on Earth or on the Moon - but it's mass will be different. A 1 kg mass will weigh less on the Moon (about 1.6 N) than it does on Earth (about 10 N), simply because the force of gravity pulling on it is less
Información
- Descripción
- AS - Level (P3) Physics Test sobre P3 Quiz, creado por RueFromDistrict11 el 13/04/2015.
- Autor
- RueFromDistrict11
- Idioma
- English
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- 4
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