# Physics Chapter 6-8

### 48 terms by aheathercombs

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doubled

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

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

Newtons 2nd Law

### It is correct to say that impulse is equal to

the change in momentum it produces

### 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

Newtons 3rd law

long time

near the outside

coin

rotation

increases

### For a system in mechanical equilibrium

the resultant forces and torques must both be zero

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

directed toward the center of the curve

### On a balanced seesaw, a boy three times the mass as his partner sits

1/3 the distance from fulcrum

striaght

### 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

### The center of gravity of a circular disk of sheet metal is

at the center of the disk

double it

### 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.

### It is correct to say that impulse is equal to

the change in momentum it produces.

### 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.

outside horse

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

### If you push an object a given distance,while applying twice the force, you do

twice as much work

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

moment of inertia

the small tree

false

gravitational

Newtons 3rd law

kinetic

twice as much

### Energy could be best described as

the capactiy to do work

### Which of the following principles explains why guns recoil

Consservation of momentum

balled up

none of these

watts

### 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

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

9 kg m/s

150J

### A moving object triples in mass, how much more momentu, does it have?

3x more momentum since the momentum directly depends on the mass.

Example: