Forces
What is the best definition of force?
A push or a pull upon an object due to its interaction with another object.
What is the SI unit for mass?
Kilograms (kg)
What is the correct value of 8,900,000 in scientific notation?
8.9 x106.
Calculate the weight of an object with a mass of 6 kg on Earth (gravitational field strength = 10 N/kg).
W = mg = 6 kg x 10 N/kg = 60 N.
What does Newton's First Law state?
An object at rest stays at rest unless acted upon by a net force.
Which type of force keeps planets in motion around the sun?
Gravitational.
What is the SI unit of weight?
Newtons (N).
What is the correct value in full of 5.76 x 104?
57600.
If an unopened can of paint has a mass of 5.25 kg and the empty can have a mass of 0.83 kg, what is the weight of the paint in the can?
W = mg = (5.25 kg - 0.83 kg) x 10 N/kg = 44.2 N.
When a man riding a skateboard hits a curb, what law is demonstrated?
Newton’s First Law.
Two soccer players kick a soccer ball with forces of 75 N and 125 N in opposite directions. What is the net force on the ball?
50 N in the direction of the stronger force.
What is the SI unit of force?
Newton (N).
Convert 532 km/h to m/s.
532 x1000 m/3600 s = 147 m/s.
What is the mass of a 70 N object on Earth?
m = W/g = 70 N/ 10 N/kg =7 kg.
What does Newton's Third Law state?
For every action, there is an equal and opposite reaction.
Say true (T) or false (F) for the statement: The gravitational force is a type of contact force.
False.
What is the SI unit of the gravitational strength?
N/kg or m/s2
What is 0.89 x 107 in standard notation?
8,900,000.
An unopen can of paint has a mass of 5.25 kg. What is the total weight?
W = mg = 5.25 kg x 10 N/kg = 52.5 N.
When a soccer player kicks a ball, what law is being applied?
Newton’s Second Law.
What is the net force in the y-axis if the forces acting are 5 N upward and 4 N downward?
1 N Upward.
What is the SI unit of volume?
Cubic meters (m³).
What is the scientific notation for 0.00056?
5.6 x 10-4.
What happens to the weight of an object when it is taken to a mountain top where the gravitational field is weaker?
Weight decreases.
What is the reaction force when you push off the ground with your feet?
The ground pushes back with an equal and opposite force.