EXTRA review #3 (Newton Laws & Forces)

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

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

Force is a

Vector quantity

What two factors do you use to describe a force?

strength and direction

What is Newton's First Law known as? The Law of                     

Inertia

When you walk on a rough surface the force on the foot is created by the 

rough surface

Motions need an unbalanced net force to maintain its motion

False

What is the acceleration of the following system?

10 m/s^2 to the right

The net force on the following system is

70 N to the right

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.

Two people pull on a rope in a tug-of-war. Each pull with 400 N of force. What is the net tension in the rope

Zero

The normal force

Is always perpendicular to the surface.

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

The net force on the following system is

4000 N , left

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

150 N

A magician pulls a tablecloth out from under dishes and glasses on a table without disturbing them. This scenario can be explain using,

Newton’s 1st Law

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

A

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/s²when 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

Calculate the weight (on the Moon’s surface) of a woman whose mass is 55 kg.  Consider gravitational acceleration on Moon as ~ 1.62 m/s²

89 N

You weigh an object by hanging it from a rope which works by reading the amount of tension. You do this on a moving elevator.Under which of the following circumstances would you expect the scale to  read more than the actual weight

Elevator moving upward with constant acceleration