Science: Laws of Motion

Which of these is evidence that an unbalanced force is acting on an object?

• The mass of the object is changing

• The object remains at rest

• The object continues moving in a straight line

• The motion of the object is changing

Newton's First Law States........

• Objects at rest tend to stay at rest unless acted on by an outside force.

• Objects accelerate often and it is difficult to know when or how they will accelerate.

• Objects in motion tend to stay in friction unless acted on by an outside force.

• Objects at rest tend to stay at rest unless acted on by an outside momentum.

What is inertia?

• An object that is accelerating

• An objects tendency to stay at rest or in motion

• Gravitational force

• An unbalanced force

Inertia depends on __________.

• Velocity

• Acceleration

• Mass

• Speed

An object with a mass of 100 kg is observed to accelerate at the rate of 5 m/s2. Calculate the force required to produce this acceleration.

• 20N

• 500 Kg

• 500 M/S

• 500N

A force of 40 N acts upon a 2 kg block. Calculate the acceleration of the object.

• 20 m/s²

• 80 m/s²

• 20 m/s

• 80 m/s

A 0.100kg

egg falls from the fifth floor of a building. If the egg falls under the influence of gravity at a rate of 9.8ms^2

, calculate for the force that causes the egg to fall.

• 9.8 N

• 98 N

• 980 N

• 0.98 N

Jay has a football with an undetermined mass. He throws the ball with a force of 50N

. He is standing on a football field so he can figure out the acceleration of his throw using the markings on the field. Therefore, he knows that the ball traveled with an acceleration of 25 ms^2

. What was the ball's mass in kilograms?

• 0.2 kg

• 2 kg

• 20 kg

• 200 kg

A boy pushes against a wall. According to the third law of motion, how will the wall react?

• The wall will move with a speed that is equal in magnitude and opposite in direction as the push.

• The wall will accelerate with the same magnitude as the push.

• The wall will push the boy with a force that is equal in magnitude and opposite in direction as the push.

• The wall will move in the same direction as the push.

Identify the action-and-reaction forces in the illustration below.

• Action: The ball pushes the ground. Reaction: The ground pushes the ball.

• Action: The ball pulls the ground. Reaction: The ground pulls the ball.

• Action: The ground pushes the ball. Reaction: The ball pushes the ground.

• Action: The ground pulls the ball. Reaction: The ball pulls the ground.