Contact Forces
What is a contact force? Give an example.
A contact force is a type of force that occurs when two objects are physically touching each other. (Need an example)
What is a non-contact force? Give one example.
A non-contact force is a type of force that acts on an object without any physical contact between the objects involved. Include an example.
What is a force diagram, and what does it visually represent?
A force diagram visually represents all the forces acting on an object, showing their directions and magnitudes.
What is a net force?
Net force is the total force acting on an object after combining all the individual forces, determining how the object will move.
What is an independent variable? Provide an example from a simple experiment.
Something that is changed in the experiment. Example.
Give two examples of contact forces and explain how they act on objects.
Any two examples
How does gravity act as a non-contact force between the Earth and an object?
Weight on object, gravitational field, gravitational force
Draw a force diagram for a book resting on a table. Identify all the forces acting on the book.
Gravity, Normal Force
If two forces of 10 N and 15 N are acting in the same direction on an object, what is the net force acting on the object?
25N
Define a dependent variable. Give an example.
A dependent variable is the factor in an experiment that is measured so see the effect of the independent variable. With an example.
Compare and contrast contact forces with non-contact forces. Provide examples for each.
Contact involves a force where objects are physically touching whilst non-contact involves a force without two objects physically touching
Compare and contrast gravitational force and magnetic force as types of non-contact forces. Provide an example of each.
Gravitational Force: The force that causes a dropped ball to fall to the ground. The Earth pulls the ball towards its center due to gravity.
Magnetic Force: A refrigerator magnet sticking to a metal surface. The magnet exerts a magnetic force on the metal, causing attraction.
Explain the difference between balanced and unbalanced forces. How would this be represented in a force diagram?
Balanced forces are equal in magnitude and opposite in direction, resulting in no motion change. Equal Arrows.
Unbalanced forces causes a change in shape, direction or speed. Unequal arrows.
An object experiences two forces: a 30 N force to the right and a 10 N force to the left. What is the net force acting on the object, and in which direction does it move?
20N and to the right
In a study measuring the effect of sunlight on plant growth, identify the independent variable, the dependent variable, and one controlled variable.
Independent: Different sunlight intensities
Dependent: Stem length
Controlled: Same type of plant
A 10 kg box is pushed along the floor with a force of 50 N. If the frictional force opposing the motion is 20 N, what is the net force acting on the box?
30N
Explain why two magnets either attract or repel each other without touching. What determines the direction of the force between them?
Two magnets attract or repel due to their magnetic fields. Opposite poles (north and south) attract, while like poles (north-north or south-south) repel. The direction of the force is determined by the orientation of the poles relative to each other within their magnetic fields.
A 5 kg box is being pulled to the right with a force of 20 N, while a frictional force of 5 N opposes its motion. Draw a force diagram for the box and calculate the net force acting on it.
Net Force: 15N
A 50 kg object is subject to a gravitational force of 490 N downward and an upward force of 600 N. Calculate the net force acting on the object.
110N
Explain why it is important to keep constant variables the same in an experiment. How can changing a constant variable affect the results?
Keeping constant variables the same is crucial to ensure that any observed changes in the dependent variable are solely due to the independent variable, as altering a constant variable can introduce uncontrolled factors that skew the results.
A car is moving at a constant speed on a flat road. What are the two contact forces acting on the car?
Friction, Normal Force
A charged balloon is brought near a wall. Describe the process of electrostatic induction that occurs. What happens to the charges in both the balloon and the wall, and how does this lead to an attractive force between them?
When a charged balloon approaches the wall, it induces opposite charges on the wall's surface. The wall's positive charges move closer to the balloon, while negative charges are repelled. This separation of charges creates an attractive force between the balloon and the wall.
A car is accelerating to the right on a flat road. Draw a detailed force diagram showing all the forces acting on the car
Forces include friction, gravitational, push, normal force.
A 100 kg crate is pulled across a rough surface with a force of 400 N to the right. If the frictional force opposing the motion is 150 N, calculate the net force acting on the crate.
250N
Design your own experiment and name the Independent, dependent and controlled variables in the experiment.
Approved by teacher