CH 3 Vocab Question Preview (ID: 27141)

CH 3 Vocab.

A push, pull, or other action that has the ability to change motion is called a (n)
a) Newton
b) Force
c) Acceleration
d) free fall

The inertia of an object is related to its:
a) Mass and velocity
b) mass and force
c) mass only
d) velocity only

Which of the following demonstrates Newton’s first law of motion?
a) A shopping cart at rest will stay at rest until pushed by a shopper
b) An object on the dashboard will continue moving forward when a car turns sharply
c) A magician is able to pull a tablecloth out from under dishes set on a table.
d) All of the above

The SI unit of force preferred by scientists is the:
a) Kilogram (kg)
b) newton (N)
c) liter (L)
d) pound (lb)

If the net force acting on a moving object is zero, the object will:
a) Slow down and eventually stop
b) Continue at the same speed but change direction
c) Continue in the same direction but change speed
d) Continue in the same direction with no change in speed

A ball with a mass of 1kg is moving is a straight line at the same speed as a ball with a mass of 10 kgs. Which of the following is true of the force required to stop the balls?
a) It takes less force to stop the 10 kg ball because it has less inertia
b) It takes more force to stop the 1 kg ball because it has more inertia
c) It take the same force to stop both balls because they are moving at the same speed
d) It takes less force to stop the 1kg ball because it ha

A car reaches a speed of 80 kilometers per hour, and then suddenly crashes into the concrete wall. Without a seatbelt, the crash test dummy slams into the car’s dashboard because:
a) The crash test dummy’s kinetic energy drops to zero.
b) The dash is pushed backwards into the crash test dummy.
c) The momentum of the car is being transferred to the crash test dummy.
d) The car has stopped, but the crash test dummy is still moving forward.

Is it possible for an object to move at constant speed without a force pulling or pushing it?
a) No, a constant force is needed to keep an object moving at constant speed.
b) No, a force is needed to keep an object moving at constant speed, but it doesn’t have to be a constant force.
c) Yes, an object will move at constant speed unless a force acts to change its motion.
d) Yes, an object will move at constant speed as long as the force inside the object doesn’t run out

The acceleration due to gravity is:
a) not a real force
b) the same for all objects
c) what makes a car slow down
d) More for objects with more mass

terminal velocity is:
a) how fast you can go
b) the same for a feather and a bowing ball
c) the speed of an airplane when it breaks the sound barrier.
d) The maximum velocity reached by an object in free fall.

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