Relative Motion

Question 1

What is a uniform acceleration motion?

Answer 1

an object is moving at constant acceleration along a straight line.

Question 2

In what ways we can express the constant acceleration?

Answer 2

3 ways :
1. v = Vi + at
2. d = Vi + at^2/2
3. v^2 = V^2i + 2ad

Question 3

Distances travelled after each unit of time are not equal.

Answer 3

TRUE

Question 4

The graph of distance against time is parabola; hence distance is inversely proportional to the cube.

Answer 4

FALSE, Directly and squared.

Question 5

Define Free-falling

Answer 5

A free-falling object is one that is falling under the sole influence of gravity.

Question 6

Does free-falling encounter air resistance?

Answer 6

FALSE. Not encounter.

Question 7

What is the constant acceleration downward?

Answer 7

-9.8 m/s^2

Question 8

How do you express a free fall that has zero initial velocity?

Answer 8

3 Possible ways:
1. v = gt (where g, stands for acceleration. t for time)
2. d = gt^2 /2
3. v^2 = 2gd

Question 9

Constant negative slope indicates a constant negative acceleration

Answer 9

TRUE

Question 10

Free falling objects always have the same downward acceleration.

Answer 10

TRUE

Question 11

When moving upward: velocity is positive, and acceleration is? what will be the correct sign for constant acceleration? and is it slowing down or speeding up?

Answer 11

Negative. (-9.8m/s^2), slowing down.

Question 12

When moving downward: velocity is negative, and acceleration is? what will be the correct sign for constant acceleration?

Answer 12

Also negative ( -9.8 m/s^2) but the object is speeding up.

Question 13

An object free fall from a height without the initial velocity. The object hits the ground 2 seconds later. Acceleration due to gravity is 10 ms-2. Determine height.

Answer 13

SOLVE

Question 14

An object dropped from a height of h above the ground. The final velocity when object hits the ground is 10 m/s. What is the time interval to reach ½ h above the ground. Acceleration due to gravity is 10 m/s2.

Answer 14

SOLVE

Question 15

A fruit free fall from its tree at the height of 12 m above the ground. If acceleration due to gravity is g = 10 m/s2 and the friction of air ignored, then determine the height of the fruit above the ground after 1 second.

Answer 15

SOLVE.

Question 16

What is the motion of an object thrown (projected) into the air?

Answer 16

PROJECTILE MOTION.

Question 17

any object that once projected or dropped continues in motion by its own inertia and is influenced by the downward force of gravity?

Answer 17

PROJECTILE

Question 18

Trajectory?

Answer 18

Path followed by an object.

Question 19

What shape occurs in a projectile motion?

Answer 19

PARABOLA

Question 20

The highest point the object reaches at the top of the parabola

Answer 20

HEIGHT

Question 21

How to solve the total time spent by a projectile in air?

Answer 21

t = square root of 2dy/g .

Question 22

For total distance fallen is equal to?

Answer 22

dy = gt^2/2

Question 23

What is the horizontal displacement of projectile?

Answer 23

Range. Formula: dx =vxt

Question 24

An eraser roll off the edge of a table with 0.72 m high and strikes the floor at a point 0.03 m horizontally from the edge of the table. Find the (a) time of its flight ; (b) its initial horizontal velocity.

Answer 24

SOLVE.

Question 25

How to solve for x-direction (Range)?

Answer 25

Vx = vcosteta.

Question 26

what is the formula for y-direction (height)?

Answer 26

Vy = vsinteta