Physics Final A

what does a diagram for a 5.0kg flying squirrel gliding vertically from a tree to teh ground at a constant velocity look like?

↑ ☐ ↓

what does a diagram for a trapeze artist lowered by the bar at a constant speed look like?

↑ ☐ ↓

what does a diagram for a trapeze artists raised by a bar at a constant speed look like?

↑ ☐ ↓

what does a diagram for a baseball player slowing down while sliding left to a stop look like?

↑ ☐→ ↓

Oil drop diagram looks like this: (rightward Moving) * * * * * * * * * * * * * * * what does the box thingy look like?

↑ ↑ ☐ ←☐→ ↓ ↓

what does a diagram look like for an object in free fall?

☐ ↓ fapp v=9.8 ☐ ↓fgrav v=29.4

an object is moving along a level surface with a constant velocity. The net fore acting upon the object is ___.

in the direction of motion

The forces acting upon an object are NOT BALANCED. therefore, one can be absolutely certain that the object ____.

is accelerating

The forces acting upon an object are BALANCED. therefore, one can be absolutely certain that the object ____.

is not accelerating

an object weighs 653.0 N. it is being pushed along a horizontal surface by a 268.0 Newton force. determine the coefficient of friction of the object.

.422 1) F=uN 2) u=F/N 3) 268/653

the force of gravity of objects on the moon is about one-sixth of their value on earth. Joe weights 600 N on earth. Joe's mass on the moon will be about ___.

1000N 1) multiply mass on earth X 1/6 2) multiply that ans by his weight

consider the free-body diagram shown at the right. the value of 10 for gravity to determine the net force of the object.

15 N 1)40N-25N

a 2kg object is thrown upwards with an initial velocity of 16 m/s. at the peak of the trajectory, the approximate magnitudes of the net force and acceleration are ___ N and ___ m/s/s.

20 N and 0 m/s/s

an object weighs 653.0 N. it is being pushed along a horizontal surface by a 268.0 Newton force. determine the force of friction of the object.

268 N 1) IDK

determine the weight of a 2959.0kg car that is moving at a speed on 21 m/s.

29590 N 1) plug in values into fgrav=mg

a 2 kg object is dropped from rest a free falls from the top of a tall building. after 4 seconds of free fall, its speed will be about ___ m/s and its distance of fall will be about ___ meters

40, 80

a 4kg object is dropped from rest and free falls from the top of a tall building. After 5 seconds of free fall, its speed will be about ___ m/s and its distance of fall will be about ___ meters.

50, 125

an object weighs 653.0 N. it is being pushed along a horizontal surface by a 268.0 newton force. determine the mass of the object

65.3 Kg 1) plug in values into fgrav=mg

an object weighs 653.0 N. it is being pushed along a horizontal surface by a 268.0 newton force. determine the normal force of the object.

653.0 N 1) fgrav-fnorm=0

An object moving at a constant velocity MUST ___

Be experiencing a balance of forces

List forces acting on object: book is at rest upon a table

Force due to gravity Normal force

List forces acting on object: person is standing upon the ground

Force due to gravity Normal force

List forces acting on object: a sledder slows down as it glides into the wind across some unpacked snow

Force due to gravity tension

a massive and a less massive object free-fall at the same rate because ___ a) the ratio of the net force to mass is the same for each b) the gravity is the same on each c) they weigh the same amount d) they experience the same force of gravity e) none of the above

a, b

which of the following statements are false? a) the mass and weight of an object are the same thing b) the mass of an object is the force of gravity acting upon an object c) the weight of an object is its mass multiplied by the force by gravity d) the mass of an object on the moon will be the same as its mass on earth e) the weight of an object on the moon will the same as its weight on earth f) on earth, more massive objects weigh more than less massive ones

a, b, f

List forces acting on object: a rightward moving truck skids to a stop from a very high speed with its wheels locked

air resistance force due to gravity normal force force of friction

which of the following statements are true of all free-falling objects? a) the velocity of the object is a constant value b) the mass of the object does not effect the rate at which it free-falls c) gravity is the only force acting upon the object d) air resistance has a negligible (small) effect upon the object e) the acceleration of the object is 0 M/s/s f) the net force on the object is 0 newton g) none of the above

b, c ,d

which statements are true? a) the mass and weight of an object are the same thing b) the mass of an object is the force of gravity acting upon an object c) the weight of an object is its mass multiplied by the force of gravity d) the mass of an object on the moon will be the same as its mass on earth e) the weight of an object on the moon will be the same as its weight on earth f) on earth, more massive objects weigh more than less massive ones

c, d, f

which of the following statements are true of free-falling objects of different mass? a) they have the same g value but a different acceleration b) they have the same acceleration but different g value c) the rate of acceleration is the same for all objects d) they experience the same force of gravity e) none of the above

d

formulers

fgrav=mg fnet=ma friction=uN fgrav-N=0 fapp-friction=0

List forces acting on object: an eagle glides (GLIDES) through the air along a horizontal path

force due to gravity air resistance

List forces acting on object: a parachutist falls to the ground at a CONSTANT velocity

force due to gravity air resistance tension

List forces acting on object: a football is moving upward and rightward toward the peak of its trajectory. (neglect air resistance)

force due to gravity applied force

List forces acting on object: A large crate is being pushed leftward across the floor at a constant velocity. (neglect air resistance)

force due to gravity force of friction applied force

List forces acting on object: a book is sliding across a level table (neglect air resistance)

force due to gravity normal force force of friction

List forces acting on object: a dog is being slowly pulled by his dog chain across the ground at a constant speed . (neglect air resistance)

force due to gravity normal force force of friction tension

List forces acting on object: a sign is suspended by two cables and hangs ar rest

force due to gravity tension

List forces acting on object: an elevator is suspended by cables and slowly descends through the elevator shaft. there is no contact with the walls of the elevator shaft. (neglect air resistance.)

force due to gravity tension

When all individual forces acting upon an object are balanced, it is the natural tendency of the object to ___.

keep their velocity constant (either at zero or non-zero)

the amount of matter or ¨stuff¨ in an object is refereed to as the ___ of the object.

mass

Mass is expressed in the units of ___ and weight is expressed in the units of ___

mass-kilograms Weight-newtons

A skydiver pulls the chord of his parachute. the forces acting upon the skydiver and his parachute are shown in the diagram. From this diagram, one might infer that___. ↑ 2000N ☐ ↓1000N

the skydiver will have an acceleration that is directed upwards

the force of gravity that acts upon an object is referred to as the ___ of the object

weight

A 10kg object is moving the the right at a constant velocity of 4 m/s. Which one of the following horizontal forces is required to maintain this tare of motion?

zero N

A 3kg object is moving to the right at a constant velocity of 2 m/s. Which horizontal force is required to maintain this state of motion?

zero N

what does a diagram for a rightward moving car skidding to stop with the wheels of the car locked look like?

↑ ←☐ ↓

what does a diagram for a force applied to a 1.0 kg book in order to move it toward the right and across a desk at a constant velocity look like?

↑ ←☐→ ↓

Which object could be moving to the right at a constant speed?

↑ ☐ ↓

what does a diagram for a 1.0 kg book at rest on a table top look like?

↑ ☐ ↓

what does a diagram for a 40.0kg girl suspended motionless from a bar that hangs from the ceiling look like?

↑ ☐ ↓