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### A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is

doubled

### Two objects have the same size and shape, but one is much heavier than the other. When they are dropped simultaneously from a tower, they reach the ground at the same time, but the heavier one has a greater

momentum

### To catch a ball, a baseball player extends the hand forward before impacts with the ball and then lets it ride backward in the direction of the ball's motion. Doing this reduces the force of impact on the player's hand principally because the

time of impact increased

### A 1-kg chunk of putty moving at 1 m/s collides and sticks to a 5-kg bowling ball initially at rest. The bowling ball and putty then move with a momentum of

1kgm/s

### You're driving down the highway and a bug spatters into your windshield. Which undergoes the greater change in momentum during the time of contact?

both are the same

### A rifle recoils while firing a bullet. The speed of the rifle's recoil is small because

rifle has much more mass than the bullet

### When you are in the way of a fast moving object and you can't get out of its way, you will suffer a smaller force of impact if you decrease its momentum over a

long time

### A coin and a ring roll down an incline starting at the same time. The one to reach the bottom first will be the

coin

### A car travels in a circle with constant speed. The net force on the car is

directed toward the center of the curve

### A piece of mud flies off the rim of a bycicle wheel. In what direction will it be going immediately after leaving the wheel? (Ignore gravity in this short time interval.)

On a line at a tangent to the edge of the wheel

### A 5kg ball collides head-on with a 10kg ball, which is stationary. The collision is inelastic. What statement is true?

The magnitude of the change in velocity the 5 kg ball experiences is greater than that if the 10kg ball.

### The moon is moving clackwise in a circular orbit around the Earth. Imagine if gravity was shut off, throughout the solar system, at the instant the moon is in the poistion shown. How would the moon move, after gravity was shut off.

In the direction of the down arrow, in a straight line.

### Which moves faster in m/s on a merry go round: a horse on the inside or a horse on the outside?

outside horse

### When a rigid body rotates about a fixed axis all the points in the body have the same centripetal acceleration.

False

### A smaller car and a large truck collide head-on. During the collision the small car experiences

a much larger acceleration than the truck

### What is the quantity used to measure an objects resistance to changes in rotational motion?

moment of inertia

### A tall tree and short tree (both having the same wwidth and density) are cut at the base at the same time and begin tipping over. which tree hits the grounf first?

the small tree

### An object lifted 10 meters gains 200j of potential energy. If the same object is lifted 20 meters, its energy gain is

twice as much

### A large heavy truck and a small baby carriage roll down a hill. Neglecting friction, at the bottom of the hill, the baby carriage will have a greater

none of these

### Three cars, x, y, z, begin accelerating from rest, at the same time, car x is more massive than car y, which is more massive than car z. The net force exerted on each car is identical. After 10 secs which carhas the most amount of momentum?

they all have the same momentum

### What form(s) of energy does the falling rubber ball have when it is halfway down?

Both kinetic and gravitational

### A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is

doubled

### A ball can be rolled down 3 different ramps. The final elevation loss of each ramp is the same. Neglecting friction, for which ramp will the speed of the ball be at the highest at the bottom?

The speed of the ball will be the same for all ramps.

### A merry go round spins freely when Janice moes quickly to the center along a raduis of the merry go round. Its true to say that

the moment of the inertia of the system decreases and the angular speed increases

### A 3kg blob of putty moving at 3m/s slams into a 4kg blob of putty at rest. Calculate the momentum of the 2 stuck together blobs of putty immedialty after colliding

9 kg m/s