Since acceleration is a vector quantity it has magnitude and direction [3]. Uniformly accelerated movement (UAM) is movement that always has the same acceleration, meaning that it has a constant equal force. An object with a constant acceleration should not be confused with an object with a constant velocity; an object with a constant velocity is not accelerating. The perfect example of constant force is gravity (g Earth = 9.81 m/s2), which is the force of attraction between all masses in the universe, and in this cases specially the attraction of the earth's mass for bodies near its surface [4]. If an object is held motionless in a uniform gravitational field it will fall in a constant acceleration, this means that every second that the object falls its velocity will
The value of the force constant for the spring is most nearly (A) 0.33 N/m (B) 0.66 N/m (C) 6.6 N/m (D) 33 N/m (E) 66 N/m 4. A block of weight W is pulled along a horizontal surface at constant speed v by a force F, which acts at an angle of with the horizontal, as shown above. The normal force exerted on the block by the surface has magnitude (A) W F cos (B) WFsin (C) W (D) W + Fsin (E) W + Fcos 5. When the frictionless system shown above is accelerated by an applied force of magnitude the tension in the string between the blocks is (A) 2F (B) F (C) F (D) F (E) F 6. A push broom of mass m is pushed across a rough horizontal floor by a force of magnitude T directed at angle as shown above.
decrease 4. Did the inspiratory reserve volume increase, decrease, or not change with exercise? decrease 5. Did the inspiratory capacity increase, decrease, or not change with exercise? No change 6.
KINETIC AND POTENTIAL ENERGY WORKSHEET Name:________________________ Determine whether the objects in the following problems have kinetic or potential energy. Then choose the correct formula to use: KE= 1/2 m v2 PE = mass x gravitational acceleration (9.8m/s2) x height OR Weight X Height Energy= joules Weight= Newton Mass= kilograms Velocity= m/s Gravitational acceleration= (9.8 m/s2) 1. You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30 m/s. The ball has ______________________ energy.
A. Heat travels fastest by convection through a gas. B. Heat increases the temperature of a subtance. C. Heat can travel through solids, liquids and gases.
Heat can be transferred from one place to another by three methods: conduction in solids, convection of fluids (liquids or gases), and radiation through anything that will allow radiation to pass. The method used to transfer heat is usually the one that is the most efficient. If there is a temperature difference in a system, heat will always move from higher to lower temperatures. CONDUCTION: Conduction occurs when two object at different temperatures are in contact with each other. Heat flows from the warmer to the cooler object until they are both at the same temperature.
It can be expressed as a mathematical equation: or FORCE = MASS X ACCELERATION 3. “For every action there is an equal and opposite reaction.” This means that for every force there is a reaction force that is equal in size, but opposite in direction. That is to say that whenever an object pushes another object it gets pushed back in the opposite direction equally hard. The rocket's action is to
The direction of acceleration is the same as the direction of the net force. The acceleration of the body is also directly proportional to the net force but inversely proportional to its mass. Newton defined momentum P as the product of mass and velocity. The change in momentum, symbolized by ∆P, is brought about by the impulse acting on the body, F_net ∆t=∆P As ∆t approaches zero, the instantaneous rate of change of momentum is, F_net=lim┬(∆t→0)〖∆P/∆t〗=dP/dt=(d(mv))/dt Since for most object, mass is constant, F_net=m dv/dt Newton’s second law of motion is mathematically expressed as F_net=ma From Newton’s second law T=m_1 a The hanging mass m_1 is also accelerating with the same acceleration due to the net force m_2 a on it. m_2 a=m_2 g-T T=m_2 g-m_2 a Equating the tensions m_1 a=m_2 g-m_2 a m_1 a+m_2 a=m_2 g (m_1+m_2 )a=m_2 g a=(m_2 g)/(m_1+m_2 ) The acceleration is the same acceleration described in the kinematics equation a=2s/t^2 For a body starting from rest, s is the distance traveled by the cart and t is the time of travel.
Because ‘F’ and ‘x’ are directly proportional, a graph of ‘F’ vs ‘x’ is a line with slope ‘k’ A mass on a spring is a simple harmonic oscillator which is an object that oscillates the equilibrium point and experiences a restoring force proportional to the object’s displacement. The time it takes for a spring to complete an oscillation is called the period of oscillation, ‘T’. The period of oscillation of a simple harmonic oscillator that is described by Hooke’s Law is: T=2π√(m/k). This formula shows that as the mass, ‘m’, increases and the spring
It expands when its temperature rises above 4° C. (39° F.). It also expands when it freezes. Expansion of Gases Under equal pressures, all gases expand at the same rate. A gas expands by the same proportion as the temperature rises, provided external pressure remains the same. The effect of heat on the expansion of gases is stated in Charles' Law.