Forces Flashcards
What instrument should be used to measure weight and mass?
A weighing scale should be used to measure mass that is constant, while a spring balance should be used to measure wight, which is affected by the gravitational force
What affects Frictional force?
Velocity of both objects
Mass of both objects
The surface texture of both objects
Different weights were hung on spring A and B. Spring A original length was 10cm, B was 20cm. With a 10g, 20g, and 30g load on Spring b, it’s length was 25cm,20cm, 35cm.
With a 10g, 20,g and 30g, load on Spring A, it’s height was 20cm, 30cm, and 40cm.
Which spring A or B stretches more easily? Explain Why?
Spring A. When the same load is hung on both springs, Spring A extends more than Spring B.
Name 4 example of magnetic materials.
Name two non magnetic metals.
Iron Steel Cobalt Nickel
Copper Gold
A bar magnet was placed on a piece of white paper. Some iron fillings where sprinkled onto the paper. What would you observed about the iron fillings . Explain your observations.
The greatest number of iron fillings were attracted to the poles. The poles of a magnet have the strongest magnetism
Magnets A B C D were strung on strings above a tray of iron pins and suspended in the air. Magnet a was 2 cm, B was 5 cm, C and D were 8 cm away from the pins. It was observed that 1 pin was attracted to A, B had 2, C had 2, D had 7. What can be concluded about the magnetic strength of Magnet A and Magnet D. Explain your answer.
Magnet A has the weakest magnetic strength while Magnet D has the strongest magnetic strength.
Magnet A attracted the least number of pins although it is the nearest to the pins while Magnet D attracted the most number of pins although it is the furthest from the pins.
A wooden rod was balanced on a support. Object A was glued to the underside of one side of the rod. A bar magnet with its North pole was put below object A. The side of the rod without object A tilted downwards. What could Block A be. Give a reason for your answer. Suggest one material Object A could be made of.
Object A could be a magnet.
Only magnets can repel each other. The like poles of the magnet and Object A were facing each other, causing Object A to be repelled upwards, thus the other side of the rod moved downwards.
Nickel.
Two ring magnets, X and Y, is threaded through a stick but is not attached to it. Explain why magnet X floats above magnet Y at a certain distance, d cm.
Material P is held in place between magnets X and Y. The distance between them, d, remained the same.
Based on your observation, name on property of material P.
Explain why the distance, d, remained the same.
The like poles of both magnets X and Y are facing each other so they repel each other keeping X suspended above Y against gravitational pull.
It is a non-magnetic material.
Material P allows magnetic force to pass through it and does not affect the strength of the magnetic repulsion between X and Y.
A magnetized needle was secured onto a cork and then laid onto a basin of water,. Explain how you could use this set up as a compass to tell the direction of the Earth’s North pole.
A freely hanging magnetized needle always points in a North-South direction. Hence we could follow the North-pointing end of the needle to the Earth’s North pole.
A person opened his parachute after jumping out of a plane.
Identify the forces acting on the officer once the parachute is opened.
It was observed that the person descends at a slower speed with the parachute opened. Explain the observation.
Gravitational force and frictional force.
After opening the parachute, there is a larger surface area exposed to the air, thus increasing the air resistance acting on the person and the parachute, slowing the person’s descend.
Object A was hung on a spring held in place above the table by a clamp. The length of the spring then was 5 cm. Object B was clamped below object A, and it was observed a change in position of the object A. The length of the spring now is 3 cm
State what objects A and B are.
Explain why the length of the spring became shorter.
object B was replaced with an iron bar of similar size and mass. Suggest and explain how the length of the spring will change.
They are both magnets.
The like poles of the magnets are facing each other so they repel and push the spring upwards and compress the spring.
The spring will stretch longer as the magnets attracts the iron bar.
