Forces and Motion

1. Speed is a. the rate of change in position b. a change in velocity c. a push or a pull d. change in location.

Forces and Motion 1. Speed is a. the rate of change in position b. a change in velocity c. a push or a pull d. change in location.

Forces and Motion 2. Which term indicates both speed and direction? a. magnitude b. displacement c. momentum d. velocity

Forces and Motion 2. Which term indicates both speed and direction? a. magnitude b. displacement c. momentum d. velocity

Forces and Motion 3. Which is the proper equation for find the speed of an object? a. F = MAc. v = d x t b. v = d/td. v = t/d

Forces and Motion 3. Which is the proper equation for find the speed of an object? a. F = MAc. v = d x t b. v = d/td. v = t/d

Forces and Motion 4. Any change in speed or direction is referred to as? a. accelerationc. momentum b. displacementd. velocity

Forces and Motion 4. Any change in speed or direction is referred to as? a. accelerationc. momentum b. displacementd. velocity

Forces and Motion 5. What is a force? a. change in speed over time b. the tendency to resist change in motion c. a push or pull d. apparent weightlessness

Forces and Motion 5. What is a force? a. change in speed over time b. the tendency to resist change in motion c. a push or pull d. apparent weightlessness

Forces and Motion 6. Forces that are equal in size and opposite in direction are a. balanced forces b. equilateral forces c. net forces d. unbalanced forces

Forces and Motion 6. Forces that are equal in size and opposite in direction are a. balanced forces b. equilateral forces c. net forces d. unbalanced forces

Forces and Motion 7. Which of the following will result if balanced forces act on an object? a. the object will accelerate b. the object will slow down c. the object’s velocity will not change d. centripetal force will increase

Forces and Motion 7. Which of the following will result if balanced forces act on an object? a. the object will accelerate b. the object will slow down c. the object’s velocity will not change d. centripetal force will increase

Forces and Motion 8. What is another term for an unbalanced force, a force that is NOT equal in size or opposite in direction? a. balanced force b. gravitational force c. strong force d. net force

Forces and Motion 8. What is another term for an unbalanced force, a force that is NOT equal in size or opposite in direction? a. balanced force b. gravitational force c. strong force d. net force

Forces and Motion 9. What is the result of a net force acting on an object? a. the object will accelerate b. the object remain motionless c. the object’s velocity will not change d. inertia is greater than net forces

Forces and Motion 9. What is the result of a net force acting on an object? a. the object will accelerate b. the object remain motionless c. the object’s velocity will not change d. inertia is greater than net forces

Forces and Motion 10. An objects tendency to resist changes in motion is called ___________? a. acceleration b. friction c. inertia d. unbalanced force

Forces and Motion 10. An objects tendency to resist changes in motion is called ___________? a. acceleration b. friction c. inertia d. unbalanced force

Forces and Motion An object that is only acting under the influence of gravity is ___________ a. decelerating b. in free fall c. stationary d. weightless

Forces and Motion An object that is only acting under the influence of gravity is ___________ a. decelerating b. in free fall c. stationary d. weightless

Forces and Motion For every force there is an equal and opposite reaction force is a. Newton's 1 st Law of Motion b. Newton's 2 nd of Motion c. Newton's 3 rd Law of Motion d. Newton's 4 th Law of Motion

Forces and Motion For every force there is an equal and opposite reaction force is a. Newton's 1 st Law of Motion b. Newton's 2 nd of Motion c. Newton's 3 rd Law of Motion d. Newton's 4 th Law of Motion

Forces and Motion An object at in motion remains in motion unless acted upon by an unbalanced force is which of Newtons laws? a. Newton's 1 st Law of Motion b. Newton's 2 nd of Motion c. Newton's 3 rd Law of Motion d. Newton's 4 th Law of Motion

Forces and Motion An object at in motion remains in motion unless acted upon by an unbalanced force is which of Newtons laws? a. Newton's 1 st Law of Motion b. Newton's 2 nd of Motion c. Newton's 3 rd Law of Motion d. Newton's 4 th Law of Motion

Forces and Motion The total momentum of objects before a collision equals the total momentum after a collision is described by which law? a. Law of Conservation of Mass b. Law of Conservation of Momentum c. Newtons 4 th Law of Motion

Forces and Motion The total momentum of objects before a collision equals the total momentum after a collision is described by which law? a. Law of Conservation of Mass b. Law of Conservation of Momentum c. Newtons 4 th Law of Motion

Forces and Motion Which of Newton’s laws describes the relationship between force, mass and acceleration? a. Newton's 1 st Law of Motion b. Newton's 2 nd of Motion c. Newton's 3 rd Law of Motion d. Newton's 4 th Law of Motion

Forces and Motion Which of Newton’s laws describes the relationship between force, mass and acceleration? a. Newton's 1 st Law of Motion b. Newton's 2 nd of Motion c. Newton's 3 rd Law of Motion d. Newton's 4 th Law of Motion

Forces and Motion If a projectile was fired in space it will continue to travel at a constant velocity until it hits something or is pulled into a gravity field. Which of Newton’s Law’s does this demonstrate? a. Newton's 1 st Law of Motion b. Newton's 2 nd of Motion c. Newton's 3 rd Law of Motion

Forces and Motion If a projectile was fired in space it will continue to travel at a constant velocity until it hits something or is pulled into a gravity field. Which of Newton’s Law’s does this demonstrate? a. Newton's 1 st Law of Motion b. Newton's 2 nd of Motion c. Newton's 3 rd Law of Motion

Forces and Motion A student leans against the wall. Neither the wall nor the student move. This is an example of which of Newton’s Laws? a. Newton's 1 st Law of Motion b. Newton's 2 nd of Motion c. Newton's 3 rd Law of Motion

Forces and Motion A student leand against the wall. Neither the wall nor the student move. This is an example of which of Newton’s Laws? a. Newton's 1 st Law of Motion b. Newton's 2 nd of Motion c. Newton's 3 rd Law of Motion

Forces and Motion A player strikes a ball with a bat and the ball changes direction and sails into the outfield. This is an example of which of Newton’s Laws? a. Newton's 1 st Law of Motion b. Newton's 2 nd of Motion c. Newton's 3 rd Law of Motion

Forces and Motion A player strikes a ball with a bat and the ball changes direction and sails into the outfield. This is an example of which of Newton’s Laws? a. Newton's 1 st Law of Motion b. Newton's 2 nd of Motion c. Newton's 3 rd Law of Motion

Forces and Motion A bowling ball hits some pins. Which is true of the momentum after the collision? a. The total momentum is less b. The total momentum is greater c. The total momentum is equal d. None of the above

Forces and Motion A bowling ball hits some pins. Which is true of the momentum after the collision? a. The total momentum is less b. The total momentum is greater c. The total momentum is equal d. None of the above

Forces and Motion Which of the following is also called the Law of Inertia? a. Newton's 1 st Law of Motion b. Newton's 2 nd of Motion c. Newton's 3 rd Law of Motion d. Newton’s 4 th Law of Inertia

Forces and Motion Which of the following is also called the Law of Inertia? a. Newton's 1 st Law of Motion b. Newton's 2 nd of Motion c. Newton's 3 rd Law of Motion d. Newton’s 4 th Law of Inertia

Forces and Motion Rank the following in order of increasing inertia. a. Tennis ball b. Bowling ball c. Marble d. Wrecking ball

Forces and Motion Rank the following in order of increasing inertia. Marble -> tennis ball -> bowling ball --> wrecking ball

Forces and Motion What equation is related to Newton’s Second Law? a.s = d/t b.a = (v f – v i )/t c. F = ma d.p = mv

Forces and Motion What equation is related to Newton’s Second Law? a.s = d/t b.a = (v f – v i )/t c. F = ma d.p = mv

Forces and Motion An action force of 450 N pushes on a wall to the left, what is the reaction force? a.450 N up b.225 N left c. 225 N right d.450 N right

Forces and Motion An action force of 450 N pushes on a wall to the left, what is the reaction force? a.450 N up b.225 N left c. 225 N right d.450 N right

Forces and Motion The gravitational force between two objects depends on what two things? a.Size b.Distance between the objects c.Mass d.Velocity e.Momentum

Forces and Motion The gravitational force between two objects depends on what two things? a.Size b.Distance between the objects c.Mass d.Velocity e.Momentum

Forces and Motion What is the gravitational acceleration constant on earth? a. 9.8 m/s b.98 m/s c.9.8 m/s 2 d.982 mph

Forces and Motion What is the gravitational acceleration constant on earth? a. 9.8 m/s b.98 m/s c.9.8 m/s 2 d.982 mph

Forces and Motion Momentum depends on what two things? a. density b. gravity c. mass d. volume e.velocity

Forces and Motion Momentum depends on what two things? a. density b. gravity c. mass d. volume e.velocity

Forces and Motion Which has more momentum a semi truck traveling at 10 m/s or a small car traveling at the same speed? Why?

Forces and Motion Which has more momentum a semi truck traveling at 10 m/s or a small car traveling at the same speed? A semi truck because it has more mass.

Forces and Motion Describe the motion of an object whose distance vs. time graph looks like this.

Forces and Motion The object is standing still. Time is passing but distance is not increasing.

Forces and Motion Describe the motion of the object that produces the graph below.

Forces and Motion Motion at a constant speed. The line is straight so you know there is no acceleration.

Forces and Motion Describe the motion of the object that produces the graph below.

Forces and Motion The object is experiencing positive acceleration; it is speeding up.

Forces and Motion Describe and draw the path of a dart shot from a dart gun at earth’s surface.

Forces and Motion Describe and draw the path of a dart shot from a dart gun at earth’s surface. Drop of a Bullet

Forces and Motion Explain why a hammer falls faster than a feather in the classroom? Drop of a Bullet

Forces and Motion Explain why a hammer falls faster than a feather in the classroom? The feather has greater surface area and therefore more air resistance than the hammer. Drop of a Bullet

Forces and Motion So why do the feather and hammer hit the ground at the same time on the moon? Drop of a Bullet

Forces and Motion So why do the feather and hammer hit the ground at the same time on the moon? There is no air on the moon to provide the upward force of air resistance. Gravitational acceleration is constant.

Forces and Motion Calculate the average speed of a mail truck that moves 80m in 20s.

Forces and Motion Calculate the average speed of a mail truck that moves 80m in 20s. v = d/t = 80 m/20 s = 4 m/s

Forces and Motion Which is the correct equation for calculating the acceleration of an object from its change in speed? a.s = d/t b.a = (v f – v i )/t c. a = F/m d.p = mv

Forces and Motion Which is the correct equation for calculating the acceleration of an object from its change in speed? a.s = d/t b.a = (v f – v i )/t c. a = F/m this one is if you know mass and Force d.p = mv

Forces and Motion Mary coasts her bicycle down the hill. At one point, she is traveling at 5.0 m/s. 10 s later, her speed is 15 m/s. What is her acceleration?

Forces and Motion Mary coasts her bicycle down the hill. At one point, she is traveling at 5.0 m/s. 10 s later, her speed is 15 m/s. What is her acceleration? a = (v f – v i )/t = (15m/s – 5m/s) = 1 m/s 2 10 s

Forces and Motion A 30 kg object accelerates at a rate of 5 m/s 2. How much force was used to cause this acceleration?

Forces and Motion A 30 kg object accelerates at a rate of 5 m/s 2. How much force was used to cause this acceleration? Force = mass x acceleration F = ma F = 30kg x 5 m/s 2 = 150N remember a kg  m/s 2 is a Newton (N).

Forces and Motion A 300 N-force accelerates an object by 6 m/s 2. What is the mass of the object?

Forces and Motion A 300 N-force accelerates an object by 6 m/s 2. What is the mass of the object? F = ma 300N = m x 6 m/s 2 300N/ 6 m/s 2 = 50 kg

Forces and Motion What is the result if you put an object in water that is MORE dense than water? a. it floats b. it sinks c. it moves to the middle of the water Drop of a Bullet

Forces and Motion What is the result if you put an object in water that is MORE dense than water? a. it floats b. it sinks c. it moves to the middle of the water Drop of a Bullet

Forces and Motion What is the equation for calculating density?

Forces and Motion What is the equation for calculating density? D = m/V density = mass/volume

Forces and Motion What is the density of an object with a mass of 6 g and 4 ml? Drop of a Bullet

Forces and Motion What is the density of an object with a mass of 6 g and 4 ml? D = m/V 1.5 g/ml = 6 g / 4 ml

Forces and Motion If water has a density of 1 g/ml, will a substance with a density of 2.4 g/ml sink or float in water? Why?

Forces and Motion If water has a density of 1 g/ml, will a substance with a density of 2.4 g/ml sink or float in water? Why? The substance will sink because it is more dense than water.

Forces and Motion Which objects will sink and which will float in pure water (density of 1 g/mL)? a. a 6 gram object with a volume of 4 mL b. a 3 gram object with a volume of 2 mL c. a 4 gram object with a volume of 6 mL d. a 16 gram object with a vol. of 20 mL

Forces and Motion Which objects will sink and which will float in pure water (density of 1 g/mL)? a. a 6 gram object with a volume of 4 mL sink b. a 3 gram object with a volume of 2 mL sink c. a 4 gram object with a volume of 6 mL float d. a 16 gram object with a vol. of 20 mL float Hint: If the bottom number is bigger it floats! D = m/V