Physics High School

When two forces act in the same direction on an object, the net force is found by ....................the forces.

1. adding
2.subtracting
3.multipling
4.dividing

Answers

Answer 1

Answer:

By ADDING the forces

Explanation:

Related Questions

Explore the role of friction when creating safety ramps and escalators. "Why is it important for people and object to move slowly on ramps and escalator? ​

Answers

The role of friction is of great importance when creating safety ramps and escalators because with the help of friction things move.

Why is it important to move objects slowly on ramps and escalator?

It is important to move objects slowly on ramps and escalator because the ramps and escalator moves object in the opposite direction of gravity. If we did not move objects slowly, then the objects or a person get damaged.

So we can conclude that the role of friction is of great importance when creating safety ramps and escalators because with the help of friction things move.

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A 20 kg rock sits on the edge of a cliff that is 100 m high.
a. What potential energy does the rock-Earth system possess relative to the base of the cliff?
b. The rock falls without rolling from the cliff. What is its kinetic energy just before it strikes the ground?
c. What is the rock’s speed as it hits the ground?

Answers

The potential energy of the rock is 19600 J. Then, the kinetic energy when it hits the ground will be 19600 J. The velocity before it hits the ground will be 44.2 m/s.

What is potential energy ?

The potential energy of an object is the energy by virtue of its position. It is related to the mass, m ,height h and acceleration due to gravity g as follows:

p = mgh.

Given m =20 kg

height = 100 m

g = 9.8 m/s²

then  p = 20 kg × 100 m ×  9.8 m/s² = 19600 J.

When the rock falls down as it approaches the ground, the potential energy converts to kinetic energy. Hence, the kinetic energy before it strike the ground will be 19600 J.

Ke = 1/2 mv² = 19600 J

then v = √ (2 Ke/m)

v = √(2× 19600 J/20 kg) = 44.2 m/s.

Therefore, the speed of the rock as it hits the ground is 44.2 m/s.

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A bag of frozen vegetables expanding in the microwave is a good example of how volume __________.

A. increases when temperature decreases


B. decreases when temperature increases


C. decreases when temperature decreases


D. increases when temperature increases

Answers

Answer:

D

Explanation:

because when the temperature increases things tend to rise and explode instead of decreasing

Clouds are formed when water vapor in the atmosphere becomes a liquid and condenses. Condensation is a result of the difference in which of the following?
A.
air temperature and dew point temperature
B.
air pressure and air temperature
C.
dew point temperature and ocean temperature
D.
air pressure and wind speed

Answers

Answer:

B temperature and dew point temperature

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