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Forces, Friction, and Gravity
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Forces Friction Gravity Misc.
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Row 1, Col 1
What is the difference in the effects of a balanced force vs. an unbalanced force?
An unbalanced force causes a change in motion (slowing down, speeding up, starting, stopping,
changing direction). A balanced force has no effect so the object does not move since the net force is 0.
1,2
What is the effect of friction on motion?
Friction works in the opposite direction of motion so it causes an object to slow down or stop moving.
1,3
Gravity depends on ______ and _________ .
mass and distance
1,4
Two friends are trying to push a big rock. Onefriend was pushing the rock with a force of25N to the left, but the rock would not budge.The other friend came to help with a pushforce of 65N to the left. What is the net forcethat is being exerted on the rock?
90N to the left.
2,1
What is the tool and unit used to measure force?
Tool: spring scale
Unit: Newton
2,2
Describe how mass and surface affect the amount of friction that exists.
mass- The greater the mass of the object, the more friction will exist.
surface- The rougher the surface, the more friction will exist. The smoother the surface, the less friction will
exist.
2,3
How is weight related to gravity?
Weight depends on the gravitational pull on an object. The more gravity that exists, the greater the amount of
weight.
2,4
Would a ball move faster on a smoothsurface or a rough surface? Give anexample of the type of surface the
ball would move fastest on.
A ball would move faster on a smooth surface. An example of a smooth surface would be a tile floor.
3,1
A hockey player hits a hockey puck into a goal. What are the forces
being exerted on the puck?
Forces: hockey stick, hockey players hands on hockey stick, ice, gravity, goal (which causes it to stop)
3,2
Provide a positive example of friction and a
negative example of friction.
positive- walking, sand on ice, baseball gloves, sneakers
negative-clothes getting worn out, car parts heating up, water and wind erosion
3,3
Why does an astronaut weigh more on Earth than on the moon?
Earth has more gravity than the moon because it has more mass. Since weight depends on gravity, the weight
will be greater on Earth.
3,4
What is gravity?
Gravity is the force of attraction between two objects.
4,1
What is the relationship between mass and force?
The more mass an object has, the more force it requires to move the object.
4,2
What are two ways to decrease friction?
1. add a liquid or lubricant 2. add wheels 3. make the surface smoother 4. decrease mass
4,3
How does gravity affect the tides?
The gravity of the moon pulls on the side of the Earth that is facing the moon, which causes high tide on that side and the opposite side. This causes low tides on the
other sides of the Earth.
4,4
How can you increase friction?What is an example of whenyou would need to increase
friction?
To increase friction you will use a rough surface (salt, sand), and/or add mass.
Example: salt ice so that you can walk and not fall on your face
5,1
In a game of tug of war team A pulls the rope with a force of 120 Newtons to the right. Team B pulls the ropeto the left with 80 Newtons to the left. What is the net force being applied on the rope and in which direction?
The net force is 40 Newtons to the right.
5,2
List the four types of friction and provide an example for each.
1. static 2. sliding 3. rolling 4. fluid
5,3
How does gravity affect the the alignment of the planets?
The gravity of the sun and the gravity of the planets keep one another in alignment, since their mass is so huge, and
gravity depends on mass.
5,4
What is mass dependent on?
Mass depends on the amount of matter in an object.
