Forces 1
Forces 2
Forces 3
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1
A force can be defined as....
A push or pull
1
Is the pull of gravity a contact or non-contact force?
non-contact
1
Is gravity a contact or non-contact force?
Is it a push or a pull force?
Non-contact
Pull
1
How does friction change if the box surface is rough?
Friction increases
1
Is lifting a book a push or a pull?
Pull
2
The units force is measured in is.....
Newtons
2
List three contact forces and three non-contact forces.
Contact: applied, friction, air resistance, buoyancy, elastic, tension.
Non-contact: gravity, magnetic, static electricity
2
Why is it easier to slide a smooth box than a rough one?
Smooth surface has less friction
2
What are the units for weight?
Newtons
2
A falling object has a weight of 200N and experiences 100N of air resistance. Calculate its net force.
200 - 100 = 100N Downward
3
How would you describe the forces in this image?
They are balanced resulting in no movement. 0 net force
3
Explain the difference between balanced and unbalanced forces.
Balanced forces are those that are equal in magnitude but opposite in direction. The net force of balanced forces is zero. Objects acted upon by balanced forces stay at rest or move at a constant velocity. Unbalanced forces are forces that are not equal in magnitude and may or may not act in the same direction.
3
Define gravity
An attractive force between any two objects that have mass
3
Explain the difference between mass and weight
Mass is the amount of matter in an object and remains constant regardless of location. Weight, on the other hand, is the force exerted on an object due to gravity, and it can change depending on the gravitational field
3
A object is being pushed to the right with 10N of applied force. There is 5N of friction acting on the object. Calculate the net force.
10 - 5 = 5N Right
4
Explain why an object would take longer to slide down a surface of sandpaper compared to a surface of smooth, waxed wood.
Smooth, waxed wood has less friction.
4
Explain how you could get a book resting on a ramp to begin to move.
Push the book to create an unbalanced force
4
Venus has a gravitational acceleration of of 8.9m/s/s. Calculate the weight of an 8kg rover on Venus.
71.2N
4
If a heavy and a light object fall in a vacuum, which hits the ground first?
Both hit at the same time
4
Calculate the net force and direction
0 net force
5
Name 2 types of frictional forces
Static friction, sliding friction or rolling friction
5
Recall Newton's First Law of Motion
an object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
5
Would it be easier for a rocket to take off from the Earth or the moon? Justify your anser.
The moon because it has less mass. Therefore, it has a weaker gravitational field strength.
5
Calculate the net force and direction
10N to the right
5
Calculate the net force of an object that is being pushed to the right by two people with a force of 10N and 15N, is experiencing friction that has a force of 5N.
10 + 15 = 25
25 - 5 = 20N Right