Exam Two Review

What is Newton’s First Law

Every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by action of an external force.

What is Newton’s Second Law

F = m * a, For an externally applied force, the change in velocity depends on the mass of the object.

What is Newton’s Third Law

For every action (force) in nature, there is an equal and opposite reaction

What is inertia?

The tendency of an object to resist changes in its motion

What Force is always at work here on Earth due to the earth’s gravity?

Gravitational Force

A 30kg bike accelerated at 5 m/s². What was the force acting on the bike?

150 N

The normal force

Is always perpendicular to the surface

You are pushing a crate rightwards with a mass of 35 kg with a force of 450 N. The surface is rough, and the frictional force has a magnitude of 100 N. What is the net force on the mass?

Rightwards, 350 N

A bicycle and rider have combined mass of 80 kg. If a net force of 240 N is applied, what is the acceleration of the bicycle?

3 m/s²

Calculate the net force on the block shown in the picture.

2 N to the left

What is the acceleration of the above block, If the mass of the block is 1 kg.

2 m/s² to the left

Determine the Net Force present in the depicted scenario

33 N to the left

When you walk on the ground, your foot push against the ground, and the ground pushes back on you. The force that makes you walk is exerted by

the ground

A bug splatter against the windshield of moving truck. Which object experiences the greater force during the collision?

Both experience the same magnitude of force but in opposite directions.

Which statement accurately describes the mass of the astronomer?

The astronomer’s mass remains constant both on Earth and on Mars

What is energy stored in an object or person according to the location relative to the ground level?

potential energy

Sam’s total energy (KE + PE) is 8000 J as he reached 10 m above the ground in a skydiving airplane. Sam jumped from the airplane when the airplane was at zero speed. His parachute malfunctioned and he was in free fall. What is Sam’s kinetic energy just before he reached the ground level? Note: neglect the Thermal Energy

8000 J

A car is moving at a constant speed around a circular track. Which force is responsible for keeping the car moving along the circular path?

The frictional force between the tires and the road, directed toward the center of the circle

A car is moving at a constant speed around a circular track. What is the direction of the car’s net force which keep it on the circular path?

Towards the center of the circle