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
What is meant by friction?
Friction is a force that opposes motion between two surfaces that are in contact.
1
True or False:
The more mass an object has, the more weight it has.
True
1
Explain net force
the total (overall) force acting on an object
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
What can increase an object's gravity?
Objects with more mass have more gravity.
2
How do you define buoyancy in physics?
Buoyancy is the upward force exerted by a fluid that helps an object float or rise.
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
If you push the book upward on the ramp, which forces oppose the motion? Explain.
When the book is pushed upward, friction always acts in the opposite direction of motion, and gravity naturally pulls objects downward. Together, gravity and friction resist the push, making it harder to move the book up the ramp.
4
Venus has a gravitational acceleration of of 8.9m/s/s. Calculate the weight of an 8kg rover on Venus.
71.2N
4
Gabrielle and Sarah are investigating what could happen to a passenger in a car collision. A marble is carefully balanced on the trolley. The trolley is then released so it can roll down a ramp at different angles to change its speed. When the trolley hits the bottom of the ramp and stops suddenly, the marble flies off the cart. The distance the marble travels is measured using a ruler.
Identify the independent variable.
Identify the dependent variable.
Independent: Angle of the ramp (speed of the trolley)
Dependent: Distance the marble travels measured using a ruler.
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 answer.
Because the rocket weighs less on the Moon, the force needed to lift it is smaller. This means the rocket requires less thrust and less fuel to take off compared to launching from Earth.
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