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Momentum
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Gravity
Terms in this set (30)
The momentum of an object is defined as the object's __________.
a) mass times it acceleration
b) mass times its velocity
c) velocity times the time interval
b) mass times its velocity
Which has more momentum, a large truck moving at 30 miles per hour or a small tuck moving at 30 miles per hour?
a) the small truck
b) the large truck
c) both have the same momentum
b) the large truck
Compared to a sports car moving at 30 miles per hour, the same sports car moving at 60 miles per hour has ________.
a) four times as much momentum
b) the same momentum
c) twice as much momentum
c) twice as much momentum
If the momentum of an object changes and its mass remains constant, _____________.
a) its velocity is changing
b) there is a force acting on it
c) it is accelerating (it is decelerating)
d) all of the above
d) all of the above
The reason padded dashboards are used in cars is that they _____.
a) decrease the impulse in a collision
b) increase the time of impact in a collision
c) increase the force of impact in a collision
b) increase the time of impact in a collision
A ping-pona ball launcher is fired. Compared to the impulse on a ball, the impulse on the launcher is ________.
a) larger
b) the same
c) smaller
b) the same
A collision is considered elastic if _____________.
a)there is no lasting deformation
b) after the collision, the objects have the same shape as before the collision
c) the objects that collide don't get hot
d) there is no sound generated during the collision
e) all of the above
e) all of the above
Which of the following has the largest momentum?
a) a dog running down the street
b) the science building at your school
c) a pickup truck traveling down the highway
c) a pickup truck traveling down the highway
A cannon recoils from launching a cannonball. The speed of the cannon's recoil is small be the _________.
a) force against the cannon is relatively small
b) cannon has far more mass than the cannonball
c) momentum of the cannon is unchanged
b) cannon has far more mass than the cannonball
Two objects, A and B, have the same size and shape, but A is twice as heavy as B. When they are dropped simultaneously from a tower, they reach the ground at the same time, but A has higher?
a) momentum
b) acceleration
c) speed
a) momentum
The force of an apple hitting the ground depends upon?
a) the speed of the apple just before it hits
b) whether or not the apple bounces
c) the time of impact with the ground
d) air resistance on the apple as it falls
e) all of the above
e) all of the above
Recoil is noticeable if we throw a heavy ball while standing on roller skates. If instead we through the motions of throwing the ball but hold onto it, our net recoil velocity will be?
a) the same as before
b) small but noticeable
c) zero
c) zero
A karate expert executes a swift blow and serves a cement block with her bare hand.
a) the impulse on both the block and the experts hand have the same magnitude
b) the time of impact on both the block and the experts hand is the same
c) the force on both the block and experts hand have the same magnitude
d) all of the above
d) all of the above
Two gliders having the same mass and speeds move towards each other on an air track and together. After the collisions the velocity of the gliders is?
a) zero
b) one half the original velocity
c) the same as the original velocity
a) zero
The force that accelerates a rocket into outer space is exerted on the rocket by the?
a) rockets wings
b) exhaust gases
c) earths gravity
b) exhaust gases
Superman is at rest in space when he throws an asteroid that has more mass than he does. Which moves faster, superman or the asteroid?
a) they both move at the same speed
b) superman
c) the asteroid
b) superman
A 2-kg ball is thrown at 3 m/s. What is the ball's momentum? p=mv
(2-kg)(3 m/s)= 6-kg*m/s
6-kg*m/s
A ball is moving at 4 m/s and has a momentum of 48 kg m/s. What is the ball's mass? p=mv
48=(m)(4 m/s)
48/4=12
12 kg
Momentum is defined as an object's mass times its velocity.
true
impulse is defined as the force exerted on an objects time the time it lasts.
true
if the net external force acting on a system is zero, then the total momentum of the system zero.
false
when two objects collide and completely bounce apart with no lasting deformation or general heat, the collision is said to be elastic.
true
When two objects collide and completely stick together, the collision is said to be inelastic.
true
Impulses are normally smaller when bouncing takes place.
false
perfectly elastic collisions between large objects are uncommon in the everyday world.
true
when a baseball player follows through when hitting the ball, the contact time of impact in case of a collision.
true
automobile dashboards that are padded lengthen time of impact in case of a collison
true
if a net force acts on a system the systems momentum will change
true
momentum is a scalar quantity
false
What is the average momentum of a 5-kg runner who covers 400m in 50s?
v= 400m/50s = 8m/s
(50kg)(8m/s)=400 kg*m/s
400 kg*m/s
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