Physics 250 Clickers 4

You observe a man on a car, traveling at a constant velocity, drop a ball. You see the acceleration of the ball _____ and the man sees the acceleration of the ball _____

=g,=g

In order to get an object moving, you must push harder on it than it pushes back on you.

False

Two 10-newton weights are pulling on the spring scale as shown. The reading on the scale is:

10 N

A beanbag falls in an elevator that is accelerating upward at a rate of 1.1 m/s². Observers in the elevator see the beanbag fall at:

10.9 m/s²

A rocket has a thrust of 500 N, and it accelerates at 0.700 m/s². What is the rocket's mass?

714 kg

The net force on an object is in the positive x-direction. Which of the following can also be true?

All of these can be true.

What is a net force?

It is the sum of all forces acting on an object.

Which is not correct for a Newton's 3rd law pair of forces:

One force acts before the other force reacts.

If we know that an object is moving at a constant velocity, we may assume:

There is no net force acting on the object.

If a 5.0 kg box is pulled simultaneously by a 10.0 N force and a 5.0 N force, then its acceleration must be:

We cannot tell from the information given.

A horse exerts 500 N of force on a heavy wagon. The wagon pulls back on the horse with an equal force. The wagon still accelerates because:

nevertheless, there is still an unbalanced force on the wagon.

A stalled car is being pushed up a hill at constant velocity by three people. The net force on the car is:

zero.