Physics Ch. 3-6

What is a quantity that has both magnitude and direction?

Vector

As a 500-N women sits on the floor, the floor exerts a force on her of... A. 1000 N B. 500 N C. 250 N D. 50 N

B. 500 N

When a force is represented as a vector... A. the length of the arrow represents the size of the force. B. the length of the arrow is drawn to a suitable scale. C. the direction of the arrow shows the direction of the force. D. all of the above

D. all of the above

Is mass a vector quantity?

No, magnitude and direction are.

What is the minimum resultant possible when a 3-N force is added to a 8-N force?

5 (8-3=5)

another way of stating 1.414 is what?

square root of 2

If an airplane is flying into a headwind, you *________ the velocity of the tailwind to the velocity of the plane.

subtract

the vector component depicted by the equation: dy = 1/2 gt

vertical

What us the maximum resultant possible when a 3-N force us added to an 8-N force?

11 (8+3=11)

If the resultant vector is 5 units and one of the components is 4 what is the other?

3

If the 4 unit component is the horizontal vector component, then the 5 unit component (the resultant) is what?

37.5 from the 4 unit component

Newtons _____ law: whenever an object exerts force on a second object, the second object exerts an equal and opposite force on the first object.

3rd

Whenever one object exerts force on another object, the second object exerts a force of the same magnitude on the first object, but in the opposite direction. A. always true B. sometimes true C. always false

A. always true

According to Newton's third law, if you push gently on something, it will push A. gently on you B. gently on something else C. on something only under the right conditions D. on you only if you are not moving

A. gently on you

An unfortunate bug splatter against the windshield of a moving car. Compared toe the deceleration of the car, the deceleration of the bug is... A. larger B. smaller C. the same

A. larger

The horizontal component of a projectiles velocity is independent of A. the vertical component of its velocity B. the range of the projectile C. time

A. the vertical component of its velocity

What is a formula that you use to calculate the resultant speed (or ground speed) ?

A2 + B2 = C2 (V2)

At what point in its path does a projectile have its minimum speed? A. what it is thrown B. half-way to the top C. At the top D. As it nears the ground

At the top (There is acceleration but NO velocity)

A women weighing 500 N sits on the floor. She exerts a force of... A. 1000 N B. 500 N C. 250 N D. 50 N

B. 500 N

Which of the following would NOT be considered projectile? A. A cannonball thrown through the air B. A cannonball rolling down a slope C. A cannonball thrown straight up D. A cannonball rolling off the edge of the table

B. A cannonball rolling down a slope

A is ball thrown into the air between 10 and 90 degrees. At the top of the balls path, its velocity is... A. entirely vertical B. entirely horizontal C. both vertical and horizontal D. There is not enough info given to determine.

B. entirely horizontal

If a horse pulls on a wagon at rest, the wagon pull back equally as much on the horse. Will the wagon be set into motion? A. no, because the forces cancel each other. B.Yes, because there is a net force action on the wagon C. Yes, because there is a time delay between action and reaction D. Yes, because the horse's pull on the wagon is larger than the wagons pull on the horse

B.Yes, because there is a net force action on the wagon

In absence of air resistance, a thrown ball will travel the greatest distance across the ground if it is thrown at an angle of... A. 75 degrees B. 60 degrees C. 45 degrees D. 30 degrees

C. 45 degrees

Force always occurs... A. when velocities are constant B. as single quantities C. in pairs D. in triplets

C. in pairs

A high school students hits a nail with a hammer. During the collision, there is a force... A. on the hammer but not on the nail B. on the nail but not on the hammer C. on the nail and also the hammer

C. on the nail and also the hammer (Because f1=f2 - Whenever a one object exerts force on another object that object exerts force back. )

The weight of a person can be represented by a vector that acts ... A. perpendicular to the ground underneath the person B. parallel to the ground C. straight down, even though the person is standing on a hill. D. in a direction that depends on where the person is standing

C. straight down, even though the person is standing on a hill.

An unfortunate bug splatter against the windshield of a moving car. Compared to the force of the car on the bug, the force of the bug on the car is... a. larger b. smaller c. the same d. need more info to say

C. the same

When a football is kicked, the action and reaction forces do not cancel each other because... A. they are truly equal and opposite B. they are equal and opposite, but not at the same time. C. they act on different objects (the kickers foot and the ball) D. the kickers force on the ball is larger than the balls force on the kicker

C. they act on different objects (the kickers foot and the ball)

If a bicycle and a parked car have a head-on collision, is the force if tge impact greater on the bike?

No because the bike and the car have the same force. f1=f2

Is it true that X and Y vectors are the resultant of the vector?

No, the line dividing them is.

In order to move a cart forward, does a horse have to pull harder on the cart than the cart pulls on the horse?

No. They have the same force. f1=f2

When drawing the components of a vector, you should first draw certain rectangle called a...?

Parallelogram

What is the vector sum is called?

Resultant OR displacement

What is a quantity that has magnitude?

Scalor

Can a single vector be replaced by two vectors in the X and Y directions?

Yes

Is a rocketship is pushed foward by gases that are forced out of the back of the ship?

Yes

When one object exerts on another, does the second object always exert a force back on the force object?

Yes (Ex/ If you push on a wall, it pushes back at you)

When a women pushes a lawnmower along the handle, does she push down as well as forward?

Yes, She does.

Can wind velocity represented as a vector quantity?

Yes, wind velocity can be.

the vertical component experiences _________ due to change in gravity; a change in velocity through time

acceleration

for every _____ there is always an equal opposing reaction

action

If an airplane is flying with a tailwind, you _____ the velocity of the tailwind to the velocity of the plane.

add

one draws a ________ in order to depict a vector

arrow

the horizontal and vertical --------- vectors are used to determine the resultant vector

component

the horizontal component of a projectile stays _______ while the vertical component does not

constant

the relationship between action and reaction is the they ______ each other

equal

The downward motion of a projectile is the same as that of _____ _____

free fall

acceleration of 10 m/s or 9.8 m/s is?

gravity

the vector component depicted by the equation: dx= vt

horizontal

The horizontal and vertical components of a projectile motion are ________ to each other?

independent

a mutual action between one thing and another

interaction

the upward reaction force on the blades of a helicopter

lift

the shape of the path of a projectile is

parabola

the diagonal resultant of two vector can be drawn by first making a________ drawing

parallelogram

the response to action force

reaction

A2+B2=V2

resultant

the result of adding two vectors

resultant