J
jennam_2005
Guest
**Hey there, If anyone can answer these multiple choice questions that would be great! Please don't guess on these, if you do not know the answer just say u don't. Thank you so much!
♥
1.) A rock is thrown vertically upwards with a speed 'v' from the edge of a cliff. At the same moment, a second rock is thrown vertically downwards with the same initial speed 'v'. Which of the following statements regarding the motion of the rocks is true (ignore air resistance.)?
a. The rock which was thrown upwards reaches the bottom of the cliff with a higher velocity
b. The rock which was thrown downwards reaches the bottom of the cliff with a higher velocity
c. Both rocks reach the bottom of the cliff with the same velocity at the same time.
d. Both rocks reach the bottom of the cliff with the same velocity but at different times
2.) Two asteroids, which are 10000 km apart, attract each other with a gravitational force of F. If the two asteroids move away from each other to a distance of 20000 km apart, how great will the gravitational force be?
a 1/4 F
b 1/2 F
c 2 F
d 4 F
3.) A girl and a boy pull in opposite directions on strings attached to each end of a spring balance. Each child exerts a force of 20N. What will the reading on the spring balance be?
a 0 N
b 10 N
c 20 N
d 40 N
4.) A person standing on a scaffold lowers an object of weight 250N by means of a rope, at constant speed. If the weight of the rope is negligible, the force that the person exerts is …
a constant and less than 250N
b equal to 250N
c less than 250N and decreasing
d greater than 250N
5.) When an apple falls from a tree, it drops to the ground because of the gravitational force between the apple and earth. F1 is the magnitude of the force exerted by the earth on the apple and F2 is the magnitude of the force exerted by the apple on the earth, then ...
a they have equal inertia.
b F1 is greater than F2.
c F1 is smaller than F2.
d F1 and F2 are equal
6.) An astronaut picks up a stone on the moon and finds its mass to be 2 kg. If the mass of the earth is 6 times more than the mass of the moon, what will the mass and the weight of the stone be on the earth?
a 2kg 12N
b 2kg 20N+
c 12kg 120N
d 20kg 200N
7.)An object is suspended from a spring balance in a lift. The reading of the balance is 200N when the lift is at rest. If the balance reading is 190N, the lift is moving ...
a downward at constant speed.
b downward and increasing in speed.
c upwards at constant speed.
d downward and decreasing in speed
8.) A horizontal force of 25 N is exerted on a box (mass 10 kg). The box accelerates at 2,0 m.s-2. What is the magnitude of the frictional force acting between the box and the floor?
a 0,0 N
b 2,5 N
c 5,0 N
d 10,0 N
9.) From which of the following may the acceleration of a body be calculated?
a The change in position of a body when a resultant force acts on it.
b The rate of change in position of a body with time when a resultant force acts on it.
c The change in velocity of a body when a resultant force acts on it.
d The rate of change in velocity of a body with time when a resultant force acts on it.
10.) A cricket ball of mass 'm' traveling at a speed of 'v', is struck back in the opposite direction with the same speed 'v'. The magnitude of the change in momentum of the ball is…
a 2 mv
b mv2
c mv
d 0
11.) A moving object X has a mass m and speed v. Another moving object Y will have twice the momentum of X if it has a mass and velocity of:
a 1/2m 1/2v
b 1/2m 2v
c 4m 1/2v
d 4m 2v
12.) The diagram below shows two blocks A and B, which are connected by a rubber band. The mass of A is twice the mass of B. The two blocks are pulled apart on a smooth horizontal surface and released simultaneously. When they are released, the blocks collide and
a both move to the right.
b both move to the left.
c both remain at rest.
d block A remains at rest and B moves to the right.
13.) An open truck is moving horizontally with a constant velocity along a frictionless track underneath a grain bin. Grain, falling vertically down, now starts falling into the truck, partly filling it as it moves along. What will happen to the momentum of the truck accumulating grain?
a It will decrease.
b It will increase.
c It will first increase and then decrease.
d It will stay the same
14.) A large and a small sphere are released at the same time from the same height above the ground. Which one of the following quantities associated with the spheres will be the same for both after 1 second, if frictional effects are ignored?
a speed
b momentum
c potential energy
d kinetic energy
15.) Which one of the following expressions has the same units as
♥
1.) A rock is thrown vertically upwards with a speed 'v' from the edge of a cliff. At the same moment, a second rock is thrown vertically downwards with the same initial speed 'v'. Which of the following statements regarding the motion of the rocks is true (ignore air resistance.)?
a. The rock which was thrown upwards reaches the bottom of the cliff with a higher velocity
b. The rock which was thrown downwards reaches the bottom of the cliff with a higher velocity
c. Both rocks reach the bottom of the cliff with the same velocity at the same time.
d. Both rocks reach the bottom of the cliff with the same velocity but at different times
2.) Two asteroids, which are 10000 km apart, attract each other with a gravitational force of F. If the two asteroids move away from each other to a distance of 20000 km apart, how great will the gravitational force be?
a 1/4 F
b 1/2 F
c 2 F
d 4 F
3.) A girl and a boy pull in opposite directions on strings attached to each end of a spring balance. Each child exerts a force of 20N. What will the reading on the spring balance be?
a 0 N
b 10 N
c 20 N
d 40 N
4.) A person standing on a scaffold lowers an object of weight 250N by means of a rope, at constant speed. If the weight of the rope is negligible, the force that the person exerts is …
a constant and less than 250N
b equal to 250N
c less than 250N and decreasing
d greater than 250N
5.) When an apple falls from a tree, it drops to the ground because of the gravitational force between the apple and earth. F1 is the magnitude of the force exerted by the earth on the apple and F2 is the magnitude of the force exerted by the apple on the earth, then ...
a they have equal inertia.
b F1 is greater than F2.
c F1 is smaller than F2.
d F1 and F2 are equal
6.) An astronaut picks up a stone on the moon and finds its mass to be 2 kg. If the mass of the earth is 6 times more than the mass of the moon, what will the mass and the weight of the stone be on the earth?
a 2kg 12N
b 2kg 20N+
c 12kg 120N
d 20kg 200N
7.)An object is suspended from a spring balance in a lift. The reading of the balance is 200N when the lift is at rest. If the balance reading is 190N, the lift is moving ...
a downward at constant speed.
b downward and increasing in speed.
c upwards at constant speed.
d downward and decreasing in speed
8.) A horizontal force of 25 N is exerted on a box (mass 10 kg). The box accelerates at 2,0 m.s-2. What is the magnitude of the frictional force acting between the box and the floor?
a 0,0 N
b 2,5 N
c 5,0 N
d 10,0 N
9.) From which of the following may the acceleration of a body be calculated?
a The change in position of a body when a resultant force acts on it.
b The rate of change in position of a body with time when a resultant force acts on it.
c The change in velocity of a body when a resultant force acts on it.
d The rate of change in velocity of a body with time when a resultant force acts on it.
10.) A cricket ball of mass 'm' traveling at a speed of 'v', is struck back in the opposite direction with the same speed 'v'. The magnitude of the change in momentum of the ball is…
a 2 mv
b mv2
c mv
d 0
11.) A moving object X has a mass m and speed v. Another moving object Y will have twice the momentum of X if it has a mass and velocity of:
a 1/2m 1/2v
b 1/2m 2v
c 4m 1/2v
d 4m 2v
12.) The diagram below shows two blocks A and B, which are connected by a rubber band. The mass of A is twice the mass of B. The two blocks are pulled apart on a smooth horizontal surface and released simultaneously. When they are released, the blocks collide and
a both move to the right.
b both move to the left.
c both remain at rest.
d block A remains at rest and B moves to the right.
13.) An open truck is moving horizontally with a constant velocity along a frictionless track underneath a grain bin. Grain, falling vertically down, now starts falling into the truck, partly filling it as it moves along. What will happen to the momentum of the truck accumulating grain?
a It will decrease.
b It will increase.
c It will first increase and then decrease.
d It will stay the same
14.) A large and a small sphere are released at the same time from the same height above the ground. Which one of the following quantities associated with the spheres will be the same for both after 1 second, if frictional effects are ignored?
a speed
b momentum
c potential energy
d kinetic energy
15.) Which one of the following expressions has the same units as