Physics III partial quiz

Match correctly the 3 Newton's 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

• 3rd Newton law of motion

• The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass

• 1st Newton law of motion

• For every action, there is an equal and opposite reaction

• 2nd Newton law of motion

What are the Kepler's laws for?

• Kepler's laws describe the motion of stars around the sun.
• Kepler's laws describe the motion of planets around the sun.
• Kepler's laws describe the motion of comets around the earth.
• Kepler's laws describe the motion of planets around the moon.

What is power?

• Power in physics is the ability to lift heavy objects.
• Power in physics is the rate at which work is done or energy is transferred.
• Power in physics is the force exerted by an object.
• Power in physics is the speed of an object.

What is mechanical energy?

• Mechanical energy is the energy produced by chemical reactions
• Mechanical energy is the energy of light and sound
• Mechanical energy is the energy possessed by an object due to its motion or position.
• Mechanical energy is the energy of nuclear reactions

What's kinetic energy?

• Kinetic energy is the energy of an object due to its chemical composition.
• Kinetic energy is the energy of an object due to its position in a gravitational field.
• Kinetic energy is the energy stored in an object at rest.
• Kinetic energy is the energy an object possesses due to its motion.

what's potential energy?

• Potential energy is the energy that an object has due to its temperature.
• Potential energy is the energy that an object has due to its speed.
• Potential energy is the energy that an object has due to its color.
• Potential energy is the energy that an object has due to its position or state.

A force of 20 Newton is applied to a body resting on a horizontal surface and moves it 2 metres. Calculate the work done by the force.

Mathematical Equivalence

ON

Find the power developed by a crane that lifts a body of 257 N, up to a height of 6.8 m in a time of 9 seconds

Mathematical Equivalence

OFF

Calculate the kinetic energy of a car of mass 500 kg moving at a speed of 13 m/s

Mathematical Equivalence

ON

What's work?

• Work in physics is the measure of an object's weight.
• Work in physics is the measure of an object's speed.
• Work in physics is the measure of energy transfer that occurs when an object is moved over a distance by an external force.
• Work in physics is the measure of time it takes for an object to move a distance.