1st Summative in PHYSICAL SCIENCE

What is the SI unit of force?

• Meter

• Kilogram

• Joule

• Newton (N)

Define the term 'acceleration'.

• Acceleration is the speed of an object.

• Acceleration is the force acting on an object.

• Acceleration is the rate of change of velocity with respect to time.

• Acceleration is the distance traveled divided by the time taken.

Explain the difference between mass and weight.

• Mass is the force exerted on an object due to gravity, weight is the amount of matter in an object.

• Mass is measured in pounds, weight is measured in kilograms.

• Mass and weight are the same thing.

• Mass is the amount of matter in an object, weight is the force exerted on an object due to gravity.

What is the law of conservation of energy?

• Energy can be converted into matter

• Energy cannot be created or destroyed, only transferred or converted.

• Energy can be destroyed completely

• Energy can be created out of nothing

Describe the concept of momentum.

• Momentum is the force exerted by an object in motion.

• Momentum is the same as inertia.

• Momentum is only dependent on an object's mass.

• Momentum is the product of an object's mass and velocity.

What is the formula to calculate work done?

• Work = Force + Distance

• Work = Force x Distance x cos(theta)

• Work = Force x Distance x sin(theta)

• Work = Force / Distance

Define the term 'power' in physics.

• Power in physics is the rate at which work is done or energy is transferred.

• Power is the speed of an object.

• Power is the ability to do work.

• Power is the force exerted by an object.

Explain the first law of thermodynamics.

• Energy can be transformed into matter

• Energy can be destroyed completely

• Energy can be created out of nothing

• Energy cannot be created or destroyed, only transformed or transferred.

What is the difference between speed and velocity?

• Speed is a vector, velocity is scalar.

• Speed is scalar, velocity is vector.

• Speed and velocity are the same thing.

• Speed is a vector, velocity is scalar.

Discuss the concept of friction in physics.

• Friction is the force that accelerates the motion of objects.

• Friction is the force that opposes the motion of objects.

• Friction is the force that causes objects to float.

• Friction is the force that attracts objects together.