Work Power Energy
Egg A is dropped from a height of 1m onto the floor. Egg B is dropped from a height of 1m into a bucket of water. Which statement correctly describes why Egg B does not break?
Egg B experiences less force over a longer time
What is the difference between speed and velocity?
Speed represents the total distance covered, while velocity represents the change in position
A man is whirling a 0.5 kg ball on a 1.0 m long string at 2 m/s. What is true about the force on the ball?
There is no force on the ball
Which of the following measurements is NOT a Scalar?
Time
Speed
Distance
Displacement
Displacement
An 8 kg dog is running at 4 m/s. What is the kinetic energy of the dog?
K = 64J
A golf club has 10 kg m/s of momentum when it hits a golf ball that is at rest. After the collision, the golf club has a momentum of 1 kg m/s and the golf ball has a momentum of 9 kg m/s. Which of the following comparisons is TRUE about the change in momentum of the two objects?
the change in momentum is equal and opposite for the two objects
If an object has a constant velocity, what can be said about its acceleration?
The acceleration is zero
If the car of 75kg is traveling around a curve of radius of 50m at a velocity of 15 m/s, what is the centripetal force of the car?
337N
For a projectile, which velocity remains constant as long as air resistance is ignored?
Total Velocity
Horizontal
Vertical
Velocity is constantly changing
Velocity is constantly changing
What is the kinetic energy of a 60 kg man running at 8 m/s?
K = 1920J
What is an object's change in momentum equal to?
the force acting on the object
the impulse acting on the object
the change in velocity of the object
the impulse acting on the object
Which of the following represents a negative displacement?
An object moving forward
An object moving backward
An object at rest
An object changing direction
An object moving backward
If the car is traveling around a curve of 50m radius at a velocity of 10 m/s, what is the centripetal acceleration of the car?
ac = 2 m/s/s
Consider a ball thrown up from the surface of tl1e earth into the air at an angle of 30° above the horizontal. Air friction is negligible. Just after the ball is released, its acceleration is:
Upwards at 9.8 m/s2
Upwards at 4.9 m/ s2
Downwards at 9.8 m/s2
0 m/s2
Upwards at 9.8 m/s2
A 1 kg ball is held at rest at a height of 2 meters above the ground. What is the gravitational potential energy of the ball-Earth system?
U = 19.62J
How much work is done when a 5 N force moves a block 4 m ?
20J
True or False- An object can be moving for 10 seconds and still have zero displacement
True
What law of motion states that acceleration is directly proportional to the net force on the object?
Newton's 2nd law
The sum of two vectors of fixed magnitudes has the greatest magnitude when the angle between these two vectors is?
A) 270° B) 0° C) 90° D) 180° E) 60°
D. 180
Momentum is mass times what?
Velocity
Force
Distance
Time
Velocity
How much work is done when a 100 N force moves a block 59 m ?
59,00J
What is the average velocity over the "round trip" of an object that is launched straight up from the ground and falls straight back down to the ground?
0
Two football players collide after running into each other at the same speed. The heavier player knocks over the lighter player.
Newton's 2 Law
The magnitude of the resultant of two vectors cannot be less than the magnitude of either of those two vectors?
A) True B) False
B) False
If an object has momentum, then it must also have ?
Impulse
Potential energy
Kinetic energy
Acceleration
Mechanical energy
Mechanical energy