WorksheetsContact and Non-contact Forces
Total questions: 40
Worksheet time: 20mins
What are the main types of contact forces?
1. Magnetic force
2. Centripetal force
3. Frictional force, normal force, tension force, applied force
4. Gravitational force
Define friction and its role in motion.
1. Friction is the opposing force between surfaces that enables control in motion.
2. Friction is a force that increases speed in motion.
3. Friction has no effect on the movement of objects.
4. Friction is the force that allows objects to float in the air.
What is the difference between static and kinetic friction?
1. Static friction acts on moving objects while kinetic friction does not.
2. Kinetic friction only occurs when objects are at rest.
3. Static friction prevents motion; kinetic friction opposes motion.
4. Static friction is always greater than kinetic friction.
Choose three examples of noncontact forces.
1. Gravitational force, magnetic force, electric force
2. Normal force
3. Frictional force
4. Tension force
What is Newton's First Law of Motion?
1. An object will accelerate unless a force is applied.
2. An object will remain at rest or in uniform motion unless acted upon by an external force.
3. An object will remain in motion only if it is on a flat surface.
4. An object will change its motion only if it is in a vacuum.
What does Newton's Second Law of Motion state?
1. The acceleration of an object is constant regardless of the net force applied.
2. An object in motion will stay in motion unless acted upon by an equal force.
3. The force acting on an object is equal to its mass multiplied by its velocity.
4. The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
Which of the statements describes Newton's Third Law of Motion?
1. An example of this law is when a swimmer pushes the water backwards with their hands; the water pushes the swimmer forward with an equal force, allowing them to move through the water.
2. A ball rolls down a hill due to gravity acting on it.
3. A car accelerates forward when the driver presses the gas pedal.
4. A rocket launches into space by pushing against the ground.
How does gravitational force affect objects on Earth?
1. Gravitational force causes objects to be pulled towards the Earth, giving them weight and affecting their motion.
2. Gravitational force has no effect on the motion of objects on Earth.
3. Gravitational force only affects objects in space, not on Earth.
4. Gravitational force pushes objects away from the Earth, causing them to float.
What is the formula for calculating gravitational force?
A) F = m1 * m2 / r
B) F = G * (m1 + m2) * r
C) F = G * m1 * m2 * r^2
D) F = G * (m1 * m2) / r^2
Explain how electromagnetic forces operate between charged particles.
1. Electromagnetic forces operate between charged particles through attraction and repulsion governed by their electric fields, as described by Coulomb's law.
2. Charged particles do not interact through electromagnetic forces.
3. Electromagnetic forces only attract neutral particles.
4. Electromagnetic forces are only relevant at very high speeds.
What are the effects of friction on moving objects?
1. Friction increases the speed of moving objects.
2. Friction has no effect on moving objects.
3. Friction slows down moving objects and generates heat.
4. Friction only affects stationary objects.
How do contact forces differ from noncontact forces?
1. Contact forces involve direct interaction; noncontact forces operate at a distance.
2. Contact forces can only occur in liquids; noncontact forces occur in solids.
3. Contact forces are always stronger than noncontact forces.
4. Noncontact forces require physical touch to act on objects.
What role does mass play in gravitational force?
1. Mass has no effect on gravitational force.
2. Only distance affects gravitational force, not mass.
3. Gravitational force is independent of the mass of the objects.
4. Mass is a key factor in determining the strength of gravitational force between two objects.
Describe a scenario where friction is beneficial.
1. Friction is unnecessary in sports, as it slows down the players.
2. Friction is detrimental in climbing, as it makes surfaces too slippery.
3. Friction is beneficial in walking, as it prevents slipping and allows for effective movement.
4. Friction is harmful in driving, as it causes skidding and loss of control.
What is the relationship between force, mass, and acceleration?
1. Force equals mass times acceleration (F = m * a).
2. Force is the product of mass and velocity.
3. Acceleration is independent of mass and force.
4. Mass is equal to force divided by acceleration.
What is the effect of increasing mass on the gravitational force between two objects?
1. Increasing mass decreases the gravitational force between the objects.
2. Increasing mass has no effect on the gravitational force.
3. Increasing mass increases the gravitational force between the objects.
4. Gravitational force is only affected by distance, not mass.
How does friction affect the efficiency of machines?
1. Friction increases the efficiency of machines by providing necessary grip.
2. Friction has no impact on the efficiency of machines.
3. Friction decreases the efficiency of machines by converting kinetic energy into heat.
4. Friction only affects machines that operate in a vacuum.
What is the role of air resistance in motion?
1. Air resistance always increases the speed of moving objects.
2. Air resistance has no effect on the motion of objects.
3. Air resistance opposes the motion of objects, slowing them down.
4. Air resistance only affects objects that are stationary.
What factors affect the strength of friction between two surfaces?
1. The materials of the surfaces and the normal force acting between them.
2. Only the weight of the objects involved.
3. The speed of the moving objects.
4. The temperature of the environment.
How does the angle of an inclined plane affect the motion of an object on it?
1. A steeper angle increases the gravitational force acting parallel to the plane, causing the object to accelerate faster.
2. The angle has no effect on the motion of the object.
3. A shallower angle always causes the object to roll back down.
4. The angle only affects the frictional force, not the motion.
What is the significance of the coefficient of friction?
1. It quantifies the amount of frictional force between two surfaces in contact.
2. It measures the speed of an object in motion.
3. It indicates the mass of an object.
4. It determines the gravitational force acting on an object.
The only particles that move freely amongst atoms are _____________.
1. protons
2. neutrons
3. electrons
The transfer of electrons through direct contact is known as _____________.
1. conduction
2. induction
3. grounding
4. a field
When solving for amount of gravitational Force you will use the Gravitational constant (G = 6.67 x10-11), what unit is this constant labeled with?
1. Newtons squared (N2)
2. Kg. m / s2
3. (N.m2/kg2)
4. Coulombs squared (C2)
The only particles that move freely amongst atoms are _____________.
1. protons
2. neutrons
3. electrons
Which of these sets of charges would look like the picture?
1. A positive charge and a negative charge
2. A positive charge and a neutral charge
3. A negative charge and a neutral charge
4. Two negative charges
Which of these sets of charges would look like the picture?
1. Two positive charges
2. A positive charge and a neutral charge
3. Two neutral charges
4. Two negative charges
Which of these sets of charges would look like the picture?
1. A positive charge and a negative charge
2. A negative charge and a neutral charge
3. Two neutral charges
4. Two negative charges
What happens to the force of gravity (Fg) when mass increases?
1. Fg increases
2. Fg decreases
3. Fg stays the same
What happens to the force of gravity (Fg) when the distance (r) increases?
1. Fg increases
2. Fg decreases
3. Fg stays the same
What happens to the electric force (Fe) when the distance (r) decreases?
1. Fe increases
2. Fe decreases
3. Fe stays the same
What happens to the electric force (Fe) when the charge (q) decreases?
1. Fe increases
2. Fe decreases
3. Fe stays the same
If an object's mass is 10 kg and it is on a planet whose gravity is 2 m/s/s, what is its weight?
A) 5 N
A) 20 N
A) 20 kg
A) 5 kg
If an object's weight is 50 N and it is on a planet whose gravity is 5 m/s/s, what is its mass?
A) 10 N
B) 10 kg
C) 250 kg
D) 250 N
An apple falls toward Earth. What happens to its WEIGHT as it falls?
A) Its weight increases
B) Its weight decreases
C) Its weight stays the same
An apple falls toward Earth. What happens to its MASS as it falls?
A) Its mass increases
B) Its mass decreases
D) Its mass stays the same
If an object's weight is 98 N on Earth. Earth's gravity is 9.8 m/s/s. What is the MASS of the object on Mars? (On Mars, g = 3.77 m/s/s)
A) 10 N
B) 10 kg
C) 960.4 kg
D) 960.4 N
A bag of sugar has a mass of 1 kg. What is its weight?
A) 1N
B) 10N
C) 1kg
D) 0.1N
The strongest part of a magnet is...
A) the bars.
B) the force field.
C) the poles.
D) the middle.
An electric ________ produces a magnetic field.
A) Battery
B) Magnet
C) Current
D Circuit
