A hammer hits a nail with a downward force of 50N.What is the size and direction of the force of the nail on the hammer?
50 N, upward
When a student is standing at rest on a bathroom scales, the scales read 500N. What is the size and direction of the force of the student on the scales?
500N downward
Calculate the weight of a person on Moon whose mass is 50kg on Earth. Moon's gravitational field strength is 1.6 N/kg.
80kg
A light plastic bag and a heavy backpack are both placed on the seat of a moving car. When the car brakes, the plastic bag barely moves, but the heavy backpack slides strongly toward the front. Which has stronger intertia, why?
The heavy backpack shows stronger inertia because it has more mass. Objects with greater mass resist changes in their motion more, so when the car suddenly stop
It is the amount of gravitational force acting on the mass of an object.
Weight
It is the amount or quantity of matter in an object.
Mass
It is the tendency of an object to remain at rest or in motion after acted upon by an unbalanced or external force.
Intertia
Describe the forces acting on the object when the resultant force on it is a non-zero number.
Unbalanced force
State Newton's first law of motion.
A body in motion will remain in motion, at constant speed and direction. A body at rest will remain at rest unless, acted upon by an unbalanced force.
State Newton's second law of motion.
Acceleration is directly proportional to force but inversely proportional to the mass of an object.
State Newton's third law of motion.
For every action there is an equal and opposite reaction.
In Newton's law of interaction, where does the word EQUAL and OPPOSITE pertaining to?
EQUAL = amount of force, OPPOSITE = direction of forces
Force A and B act on an object in opposite direction. A = 5N, East while B = 9N, West. How much is the net force (resultant force) acting on an object?
4 N, West
How much is the resultant force if the object is moving at a constant speed in a similar direction?
Zero (0)
Describe the forces acting on an object is the object is stationary or moving at the same speed in a similar direction.
Balanced forces
How will you calculate the resultant force if the forces are acted on the same axis and the same direction?
Add the forces. Get the sum. Copy the direction.
