Hw: Newton's Laws

Which of the following statements are true of both weight and mass?

Weight is a force; mass is a measure of inertia.

Select the correct statement, According to Newton's second law of motion, acceleration is proportional to force.

That means a larger force produces a larger acceleration.

If the forces on an object are balanced, the object will

both 1 and 2

Which of the following correctly states Newton's third law of motion? Forces occur in matched pairs that are

equal in magnitude and opposite in direction.

What Force is always at work here on Earth?

Gravitational

The normal force

Is always perpendicular to the surface.

The diagram shows the Forces acts on a skydiver. The skydiver affected by drag and weight. The diagram shows the direction of motion and direction of forces as well. will the skydiver continue to accelerate?

No, the sky driver will reach a terminal velocity because of his weight balance with air friction.

Which of the following answers is closest to the weight (on the Earth's surface) of a woman whose mass is 20kg?  consider gravitational acceleration as ~ 10 m/s²

200 N

You are pushing a crate rightwards with a mass of 10 kg with a force of 150 N. The surface is rough, and the frictional force has a magnitude of 100 N. what is the net force on the mass? (Hint draw a diagram and mark the forces on the diagram)

Rightwards, 50 N

The net force on the following system is,

4000 N, left

When you walk on the ground, your foot push against the ground, and the ground pushes back on you. The force that makes you walk is exerted by

the ground.

A 30 kg bike accelerated at 5 m/s². what was the force acting on the bike?

150 N

If an astronaut takes an object to the moon. Which of the following statements is true?

the weight will change but the mass will be the same.

A book is sitting on a desktop. Identify the 3rd law partner of the weight of the book. Note that weight is the force created by the earth on the book.

the force by the book on the earth

An ice skater glides across a frozen pond at a constant velocity. What is the net force acting on the skater?

Zero

You stand on a scale that rests on the floor of an elevator that is accelerating upward. What is the relationship between the force due to gravity (mg) and the normal force (N) exerted by the scale?

Normal force is larger than the weight

Which scientists drop things from the Leaning Tower of Pisa.

Galileo

When a certain force is applied to an object with a mass of 2 kg, the object's acceleration is 10.0 m/s². What is the applied force?

20 N

When a certain force is applied to an object with a mass of 2 kg, its acceleration is 10.0 m/s². When the same force is applied to a different object, its acceleration is 4.0 m/s². The mass of the second object is (note: the problem is two-step process)

5 kg

An object accelerates 8 m/s² when a force of 56 N is applied to it. What is the mass of the object?

7 kg

An object with a mass of 5 kg has a force of 40 N applied to it. What is the resulting acceleration of the object?

8 m/s/s

A bug is hit by a car. Which one experiences the greater force?

Both will experience a same force

According to the Universal Law of Gravitation, what would happen to the gravitational force between the Earth and the Moon if the distance between them became twice as large?

The force would become one-fourth as much

How does the gravitational force exert by the Earth on the Moon compared to the gravitational force exerted by the Moon on the Earth?

Both forces are equal in magnitude

A truck and a trailer weigh 8000 kg. In order to accelerate at 2 m/s², how much force would need?

16,000 Newtons

Which of Newton's Laws does this situation represent? Imagine a ball moving in a straight line directly toward when another ball collides with it. The moving ball exerts a force on the ball at rest. This causes the ball at rest to accelerate. However, the ball at rest also exerts the same magnitude of force (in the opposite direction) of the moving ball. This will cause the moving ball to decelerate or even move in another direction.

All three Newton's Laws

Which law states the need to wear seatbelts?

All three Laws

A constant force F (100 N) acts on block 1 with mass m (50 kg) and the same constant force F (100 N) acts on block 2 with mass 2m (100 kg). Which graph correctly represents the accelerations of the blocks?

B

Determine the Net Force present in the depicted scenario.

33 N to left

What is the net force acting on the crate shown on the picture?

108 N to the right

What is the acceleration of the following system?

2.16 ms^-2 to the right