Forces and Motion Test Review

Match Newton's 3 Laws An object at rest stays at rest and an object in motion stays in motion unless acted on by another force. Newton's 1st Law The acceleration of an object depends on the mass of the object and the amount of force applied. Force = Mass x Acceleration Newton's 2nd Law Whenever one object exerts a force on a second object the second object exerts an equal and opposite force. (Action - Reaction) Newton's 3rd Law For each example, click and decide if it is an example of Newton's 1st, 2nd or 3rd law Newton's 1st Law A car hits the wall and a passenger goes flying A ball sits still on the soccer field until someone kicks it. A person catches a football with their hands. Newton's 2nd Law A large car is harder to push than a small bike A bowling ball hits the pins with more force than a lighter tennis ball would A faster car hits with more force than a slower moving car. Newton's 3rd Law A skateboard rider kicks their foot backwards, and the skateboard goes forward A swimmer pushes the water back and the swimmer moves forward Air goes out of a balloon and the balloon moves forward A person sits in a chair, and the chair holds that person in place. Match the terms and definitions Speed in a specific direction Velocity A push or pull on an object Force The rate at which velocity changes with time Acceleration Distance and object travels per unit of time Speed A change in position over time. Motion Fill in the blanks below A force is a push or apull on an object. Match the definition to the correct vocabulary term. Gravity The force of attraction between two objects Mass The amount of matter an object contains Weight The downward pull of gravity on an object's mass Triple Beam Balance Tool used to find the mass of an object in grams Spring Scale Tool used to find the weight of an object in Newton's Fill in the blanks with: increases or decreases As the mass of an object increases, the force of gravity between two objects increases. As the distance between two objects increases, the force of gravity between the two objects decreases Which of these would be different for an object if measured on the Earth and on the Moon? Mass Weight Velocity With how much force does a bowling ball hit the ground with if it has a mass of 10kg and falls at an acceleration of about 10 m F = ma 100 N 10 N 1 N Calculate work needed to move a box with a force of 30N a distance of 6mRemember work = force (x) distance 5 J 0.2 J 180 J Calculate the speed of a moving sailboat that travels 300km in 6 hours. Remember speed = distance 50 km 1800km 5 km Calculate the power needed to walk up a flight of stairs if the amount of work done is equal to 1500 Joules and the time it took was 5 seconds. Remember p=w 300 W 30 W 7500W Find the speed from the graph, remember s = d 20 m 0.5 m 2 m What type of simple machine? Inclined Plane Pulley Lever Wheel and axle Which simple machine? Inclined Plane Pulley Lever Which type of simple machine? Inclined Plane Pulley Lever A man tries to step from a small boat onto a dock. When he steps forward, the boat moves backwards. Which of Newton's laws explains why this occurs? 1st 2nd 3rd Refer to the points A and B on the graph. Which term below could be used to describe the motion between these two points? No Motion Acceleration Velocity Momentum In a head-on collision, a person who is not wearing a seat belt continues to move forward at the original speed of the car because of - Weight Gravity Inertia Which graph shows that, as time increases, an object is moving at a constant speed? A rock weighs 500 N in Virginia. Which of the following is a true statement about the weight of the rock on the moon? The rock would weigh the same on the moon The rock would weigh less on the moon The rock would weigh more on the moon Which of the following is not an example of work? Move a car 10 meters Push a rock and it falls Push a wall and it does not move Which of the following ramps has the greatest mechanical advantage? Which principle best explains why the sprinkler spins? Objects in motion keep moving force is equal to mass times acceleration for every action there is an opposite reaction