1D Motion
2D Motion
Energy, Work and Power
Newton's law and forces
Momentum
100
Which of the following represents a negative displacement?
A)An object moving forward
B)An object moving backward
C)An object at rest
D)An object changing direction
B)An object moving backward
100
Which of the following measurements is NOT a Scalar? A.Time
B.Speed
C.Distance
D.Displacement
D.Displacement
100
What is the kinetic energy of a 60 kg man running at 8 m/s?
2400Joules
100
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?
A.It pushes out, away from the center of the circle
B.It pull in, toward the center of the circle
C.It pushes forward, tangent to the circle
D.There is no force on the ball
B.It pull in, toward the center of the circle
100
A layer of padding is added to car dashboards because it can reduce some injuries during a collision. How does the padded dashboard make people safer?
It increases the force of impact during the collision
it increases the time of impact during the collision
It decreases the momentum during the collision
It decreases the impulse during the collision
it increases the time of impact during the collision
200
What is the average acceleration of an object that changes its velocity from 10 m/s to 30 m/s in 5 seconds?
A)2 m/s^2
B)4 m/s^2
C)6 m/s^2
D)8 m/s^2
B)4 m/s^2
200
A football is kicked across the field. Which of the following is true ?
A.The acceleration is 0m/s/s.
B.The acceleration is positive on the way up.
C.The acceleration of the ball decreases as the ball moves upward
D.The vertical velocity of the ball is 0 m/s when the ball is at the highest point
D.The vertical velocity of the ball is 0 m/s when the ball is at the highest point
200
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
19.6 j
200
Kids were playing with balls which are of equal mass. They kicked them with different forces. Which one accelerated more?
Red ball – 10N
Blue ball – 3N
Yellow ball - 5N
None of the them
Yellow ball since force there is no relation between force and mass
Blue ball since force and acceleration are inversely related.
Red ball since force and acceleration are directly related.
Red ball since force and acceleration are directly related.
200
An 8 kg dog is running at 4 m/s. What is the kinetic energy of the dog?
64Joules
300
Which of the following represents the relationship between velocity and time for an object moving with constant acceleration?:
A linear graph
A parabolic graph
An exponential graph
A sinusoidal graph
A Linear graph
300
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:
A.Upwards at 9.8 m/s2
B.Upwards at 4.9 m/ s2
C.Downwards at 9.8 m/s2
D.0 m/s2
C.Downward.9.8 m/s2
300
A 4 kg pendulum is pushed up from the ground with a velocity of 10 m/s. What maximum height will the pendulum reach?
5.1 m
300
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?
50N
300N
337N
750N
337N
300
A 10 kg toy helicopter is flying at a height of 6 meters above the ground at a velocity of 5 m/s when its battery dies. What is the velocity of the toy helicopter when it hits the ground?
10.8m/s
400
What is the difference between speed and velocity
A,Speed is a scalar quantity, while velocity is a vector quantity
B.Speed is measured in meters per second, while velocity is measured in meters
C.Speed represents the total distance covered, while velocity represents the change in position
D.Speed is always positive, while velocity can be negative or positive
Speed is a scalar quantity, while velocity is a vector quantity
400
A golf ball resting on the ground is struck by a golf club and given an initial velocity of 50 m/s at an angle of 30 degrees above the horizontal. The ball heads towards a fence 12 meters high at the end of the golf course, which is 200 meters away from the point at which the golf ball was struck. Neglect air resistance on the golf ball. What is the horizontal component of the velocity right after the gold ball is stuck
A.0 m/s
B.25 m/s
C.43.3 m/s
D.7 m/s
C.43.3m/s
400
A pendulum with a mass of 0.8 kg is released 1.6 m above the ground. What is the velocity of the pendulum when it hits the ground?
5.6 m/s
400
A ball was spinning around on a string of a certain radius at a constant speed. Then it went around the same curve at half of the original speed. Which of the following correctly identifies the new force acting on the ball?
The new force exerted on the ball towards the center of the curve was four times as much as before
The new force exerted on the car towards the center of the curve was one-half as much as before
The new force exerted on the ball towards the center of the curve was two times as much as before
The new force exerted on the car towards the center of the curve was one-fourth as much as before
The new force exerted on the ball toward the center of the curve was one-fourth as much as before
400
A student watched a person fire an old cannon. The student noticed the cannonball moved with a very high velocity to the right and the cannon moved very slowly to the left.
Which statement BEST explains the student's observations?
The total momentum of the system was zero before the cannon was fired. Since momentum was conserved, the cannonball's momentum and the cannon's momentum must have been equal in magnitude but opposite in direction
The total kinetic energy of the system was zero before the cannon was fired, so the cannonball and cannon must have had equal and opposite amounts of kinetic energy.
The cannon gave most of its momentum to the cannonball, so the cannonball gained more speed than the cannon.
The cannon gave most of its momentum to the cannonball, so the cannonball gained more speed than the cannon
500
The velocity-time graph below depicts the motion of an automobile.
Determine the velocity of the automobile at the following instant(s) in time: t = 3.0 s
6m/s
500
An object is launched across a room. How can a student
determine the average horizontal velocity of the object using only a meter stick and a calculator?
A.The student can measure the initial velocity and acceleration and use that information to calculate objects final velocity.
B.The student can measure the recoil distance of the throwing mechanism and then calculate the velocity from the conservation of momentum principle.
C.The student can measure the horizontal distance traveled, determine the flight time from the measured vertical drop, and then calculate the average horizontal velocity.
C.The student can measure the horizontal distance traveled, determine the flight time from the measured vertical drop, and then calculate the average horizontal velocity.
500
Use the scenario to answer the following question.
A student hits a hockey puck with a hockey stick and the puck speeds up. Another student claims that the student broke the Law of Conservation of Momentum because the puck gained momentum.
Which of these is the BEST explanation of why the Law is not broken in this closed system?
A.The force on the puck cancels the force on the hockey stick because the forces are equal and opposite
B.w of Conservation of Momentum only applies for objects of equal mass.
C.The hockey stick loses as much momentum as the puck gained.
The hockey stick loses as much momentum as the puck gained.
500
What else should her drawing include and why?A student is drawing a free body diagram for the following scenario: "A penguin accelerates by sliding down an icy hill on its belly."
What else should her drawing include and why/
A.It should include an arrow pointing down along the ramp, because the force of inertia pulls the penguin down the ramp
B.It should include an arrow pointing straight up, because the normal force of the hill is the reaction force to gravity.
C.It should include an arrow pointing down along the ramp, because the force of friction pulls the penguin down the ramp.
D.It should include an arrow pointing upward, perpendicular to the ramp, because the normal force represents the support force of the surface.
It should include an arrow pointing upward, perpendicular to the ramp, because the normal force represents the support force of the surface.
500
Students were tasked with dropping a 0.2 kg bag of marbles straight down into a 1.0 kg toy cart moving at 3.0 m/s. The students compare the velocity of the cart before and after the marbles are dropped.
How did the addition of the bag of marbles affect the velocity of the cart?
The Cart's velocity stayed constant because the 0.20 kg bag was small when compared to the 1.0 kg mass of the cart.
The cart slowed down because it now contained more mass. The momentum of a closed, isolated system is always constant
The cart's velocity stayed constant. Since the bag fell straight down, the force it exerted was perpendicular to the horizontal motion of the cart.
The cart's velocity stayed constant. Since the bag fell straight down, the force it exerted was perpendicular to the horizontal motion of the cart.