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# Physics

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Cards in this guide (22)
What one word indicates the difference between vector and scalar measurements

Direction.

A scalar has only magnitude, while a vector has both magnitude and direction.

Upward velocity is considered a negative

false

A ball is thrown horizontally at 20 ms from the top of a cliff 50 meters high How long does it take the ball to reach the ground

Use the equation [ D = 1/2 g t2 ] .

D = the distance of free-fall = 50 m

g = acceleration of gravity = 9.8 m/sec2

t = time in free-fall

D = 1/2 g t2

2D / g = t2

t = sqrt( 2D / g ) = sqrt( 100 / 9.8 ) = 3.1944 seconds(rounded)

The horizontal velocity that the ball has when it's launched doesn't appear

in the calculation, because it makes absolutely no difference in the result.

Any effects of air resistance have been ignored in arriving at this solution.

A ball is thrown horizontally from a cliff and hits the ground 4 seconds later 40 meters from the base of the cliff how high was the cliff rounded to the nearest tenth of a meter

Ignoring air resistance:

The distance from the base of the cliff is irrelevant as the only force acting on the ball is gravity acting straight down, giving it acceleration due to gravity.

s = ut + 1/2 at^2

For this problem: u = 0 m/s, t = 4 s, a = g (= acceleration due to gravity)

No value is given for g, but as an answer to the nearest tenth is required (1 dp), I'll use a value for g to 2 dp so that I can then round the answer to 1 dp: I'll use g ≈ 9.81 m/s^2

→ s ≈ 0 m + 1/2 x 9.81 m/s^2 x (4 s)^2 = 78.48 m

Rounded to the nearest tenth → 78.5 m.

horizontal distance = speed x time s = vt

45 = 15 t

t = 3 seconds

The momentum of two objects before collision is the same as the momentum of the two objects after collision

Yes. The total momentum would be the same. This is an example of the conservation of linear momentum.

What type of measurement A northwesterly wind of 5 miles per hour

vector
It is a meteorological measurement.

Two forces act on the same object One force is pushing due east with a force of 6 newtons and the other is pushing due north at 8 newtons What is the resulting force

10 newtons NE. a little more north than east

A golfer tees off and hits a golf ball at a speed of 31 ms and at an angle of 35 degrees what is the horizontal velocity component of the ball

25.4

What is the vertical component influenced by

Gravity

A ball is thrown horizontally from a cliff at a speed of 15 ms and strikes the ground 45 meters from the base of the cliff How high was the cliff rounded to the nearest meter

A plane is flying north at a speed of 200 miles per hour The wind is blowing at a constant speed of 40 miles per hour from the east What is the resulting speed of the plane calculated to the nearest

204 mph

In what type of orbits do planets move around the sun

elliptical

A player kicks a soccer ball from ground level and sends it flying at an angle of 30 degrees at a speed of 26 ms What is the vertical velocity component of the ball to the nearest ms

13

What type of measurement is this the force of 10 newtons

scalar

What type of measurement is a wind speed of 25 miles per hour

SCALAR

A football is thrown horizontally off the top of an apartment house that is 78.4 meters high the ball is thrown at a speed of 15 ms how far will the ball travel before hitting the streets below

"60" or "sixty"

What type of measurement is the air pressure inside a tire

SCALAR

A golfer tees off and hits a golf ball at a speed of 31 ms and at an angle of 35 degrees How far did the ball travel before hitting the ground Round the answer to the nearest tenth of a meter

92 or 91.5 meters would be the maximum height.

A golfer tees off and hits a golf ball at a speed of 31 ms and at an angle of 35 degrees What is the maximum height attained by the ball Round the answer to the nearest meter

16 or 16.1 meters is the maximum height.

A player kicks a soccer ball from ground level and sends it flying at an angle of 30 degrees at a speed of 26 ms

What term is given to the net figure that results from vector

resultant

A Ball Is Thrown Horizontally At 20 Ms From The Top Of A Cliff 50 Meters High How Far From The Base Of The Cliff Does The Ball Strike The Ground

the time it takes to get to ground is s = 1/2 at^2 where a is gravity acceleration of 9.8 m/s/s and s is 50 meters and t^2 is time squared.Solve for time t = 3.2 secondsThe horizontal distance from base of cliff is h = vt where h is distance and v is velocity = 20 m/sh = 20 x 3.2 = 64 meters

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