Duplicate of Physics Review: Newton's 1st and 2nd Laws

Question 1

A object weighing 10 N is falling and encounters 4 N of air resistance. The net force is

Accepted Answer

6 N downward

Question 2

What happens to the tension in a rope that is supporting a weight as it becomes straight?

Accepted Answer

increases to infinity

Question 3

A 2,000 kg car is towed by a line 10° to the vertical. What is the tension in the line?

Accepted Answer

20,308 N

Question 4

The weight of a person can be represented by a vector that acts

Accepted Answer

directly downward, regardless of position

Question 5

The law of inertia applies to

Accepted Answer

both moving and nonmoving objects

Question 6

All accelerations are produced by

Accepted Answer

forces

Question 7

How much will you accelerate a 100 kg punching bag if you hit it with a force of 2,000 N?

Accepted Answer

20 m/s2

Question 8

Friction

Accepted Answer

Both answers are correct

Question 9

A heavy person and a light person both parachute to the ground. Who hits the ground first?

Accepted Answer

The heavier person

Question 10

You push a 30 kg cart with a constant force of 90 N. What is the wagon's acceleration?

Accepted Answer

30 m/s2

Question 11

If the force of gravity suddenly stopped acting on the planets, they would

Accepted Answer

move in straight lines tangent to their orbits

Question 12

A 100 N lantern is suspended by a pair of ropes each 60° from the vertical. The tension in each

Accepted Answer

is more than 100 N

Question 13

A block is at rest on an incline plane. If you want to increase friction, what must happen?

Accepted Answer

Decrease the angle of incline

Question 14

On a 30° incline, a 10kg mass slides down with what force?

Accepted Answer

49 N

Question 15

An object following a straight line path at constant speed

Accepted Answer

has zero net force acting on it

Question 16

What would a 20 kg object weight on Jupiter if the accel. due to gravity is 24.5 m/s2?

Accepted Answer

490 N

Question 17

What is the mass of a dog if it weighs 100 N?

Accepted Answer

10 kg

Question 18

Compared to the Earth, a 10 kg object on the moon will weigh

Accepted Answer

Less

Question 19

After a cannonball is fired into frictionless space, the amount of force to keep it moving

Accepted Answer

zero

Question 20

An object encounters 20 N of friction. The force needed to maintain constant velocity is

Accepted Answer

20 N

Question 21

One object has twice as much mass as another object. The first object also has twice as much

Accepted Answer

inertia

Question 22

You are hanging on a pair of ropes that are perfectly vertical. If you weigh 750 N, the tension

Accepted Answer

in each rope is 375 N

Question 23

The law of inertia states that an object

Accepted Answer

all of the above

Question 24

Equillibrium occurs when

Accepted Answer

When opposing forces have the same magnitude

Question 25

Negating air resistance, why does a tennis ball and billiard ball fall at the same rate?

Accepted Answer

They have the same force: mass ratio

Question 26

An object is placed on an incline plane. How does the Normal force compare to the weight?

Accepted Answer

It is less than the weight

Question 27

.1 kg mass hangs from a pulley & pulls a box on a table 2.7 m/s2 . T=.7N. Find m of the box

Accepted Answer

.25 kg

Question 28

How does the acceleration of an object relate to its mass?

Accepted Answer

Inversely proportional

Duplicate of Physics Review: Newton's 1st and 2nd Laws

Questions 28

Duplicate of Physics Review: Newton's 1st and 2nd Laws

Questions 28